Fitting part of hand tool
The fitting part of the hand tool addresses issues of torque retention and screw head wear by implementing three rotation modes and planar surfaces, enhancing rotational effectiveness and preventing bite track generation.
Patent Information
- Application Number
- DE202025100053
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-05-22
- Estimated Expiration
- 2035-01-31
AI Technical Summary
Conventional fitting parts of hand tools face issues such as insufficient torque retention, generation of bite tracks on screw heads, and inadequate wear resistance of screw corners due to protruding oblique projections.
The fitting part incorporates three modes of rotation between the fitting part and the first screw member, featuring planar surfaces that prevent bite track generation, along with a conventional second driving portion and an additional first driving portion for enhanced functionality.
This design enhances rotational effectiveness, reduces wear on screw corners, and maintains conventional usage compatibility, offering improved torque retention and preventing damage to screw heads.
Smart Images
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Abstract
Description
Technical area
[0001] The invention relates to a fitting part of a hand tool, in which there are three rotation modes between the fitting part and the first screw element, whereby the main body has an improved rotational effect. The first surface, the second surface, and the third surface are flat, whereby the first surface, the second surface, and the third surface do not produce bite marks on the first screw element during rotation. The second drive portion retains the conventional structure. The first screw element is a normal screw element. The second drive portion can be used in the conventional manner. By adding the first drive portion, the fitting part can have additional functions. State of the art
[0002] Fitting part of hand tool is known, such as US patent number: US2007 / 0125204 A1, Taiwanese patent application number: 093219645, certificate number: M270886, title: Socket with protection for screw head.
[0003] The disadvantages of this conventional hand tool fitting are as follows: 1. As in Fig. 5 and Fig. As shown in Figure 7 in the patent publication, when the socket 20 is applied to the screw head 40 and rotates it, the six inclined projections 24 are blocked approximately at the center of the six side surfaces of the screw head 40, thereby rotating the screw head 40. The inclined projections 24 protrude into the fitting hole 22. The receiving grooves 23 of the fitting hole 22 are spaced far apart from the corners of the screw head 40. The fitting hole 22 should be difficult to wear the corners of the screw head 40 when rotating. The further the inclined projections 24 protrude, the lower the probability of the corners of the screw head 40 being worn. As the inclined projections 24 protrude more, the socket 20 must have a certain wall thickness so that the socket 20 can maintain its torque. When the inclined projections 24 protrude, the outer diameter of the socket 20 is increased.The further the angled projections protrude, the larger the outer diameter of the 20 socket becomes. 2. The inclined protrusions 24 are shaped like an acute angle, which results in insufficient torque of the inclined protrusions 24. After a certain period of use of the socket 20 for turning the screw head 40, the inclined protrusions 24 may become rounded. 3. When the socket 20 rotates the screw head 40, the inclined projections 24 are in contact with the screw head 40. Since the inclined projections 24 have the shape of an acute angle, they may create bite marks on the screw head 40. Object of the invention
[0004] Problem in the prior art: When the oblique projections of the conventional fitting part protrude more, the socket must have a certain wall thickness so that the socket can maintain its torque. These projections can create bite marks on the screw head. In the fitting part of the invention, there are three rotation modes between the fitting part and the first screw element, which allows the main body to have a better rotational effect. The first surface, the second surface, and the third surface are flat, which means that when rotating, the first surface, the second surface, and the third surface do not create bite marks on the first screw element. The second drive section maintains the conventional structure. The first screw element is a normal screw element. The second drive section can be used in the conventional manner. By adding the first drive section, the fitting part can have additional functions.
[0005] The technical solution to the problem in the prior art: A fitting part of a hand tool, comprising: a main body having a fitting part, wherein the fitting part has three first drive sections, three second drive sections, and six receiving sections, wherein the three first drive sections and the three second drive sections are arranged alternately in a ring shape, wherein each receiving section is located between a first drive section and a second drive section, wherein each first drive section has a first surface, a second surface, and a first intersection line, wherein the first drive section is provided with a first groove and a second groove, wherein each second drive section has a third surface, wherein, viewed two-dimensionally, the fitting part has a first circle center, a first circle, and a first hexagon, wherein each first surface is tangent to the first circle,and wherein each first face coincides with a side face of the first hexagon.,
[0006] Compared with the prior art, the invention has the following advantages: The main body has main force application points and second force application points when tightening the first screw element clockwise and when loosening the first screw element counterclockwise. When the first screw element is rounded, the first cutting lines can be in contact with three side surfaces of the first screw element. The first cutting lines have the effect of concentrated force application points. The fitting part has the function of rotating the first screw element and the first rounded screw element. There are three rotation modes between the fitting part and the first screw element, which makes the main body have a better rotating effect. The first surface, the second surface, and the third surface are flat, which means that when rotating, the first surface, the second surface, and the third surface will not produce bite marks on the first screw element.The second drive section retains the conventional structure. The first screw element is a standard screw element. The second drive section can be used in the conventional manner. By adding the first drive section, the fitting part can have additional functions. Short description of the drawings Fig. 1 a perspective view of the fitting part of the hand tool of the invention, Fig. 2 a front view of the fitting part of the hand tool of the invention, Fig. 3 a front view of the fitting part of the hand tool of the invention, Fig. 4 a front view of the first operating state of the fitting part of the hand tool of the invention, Fig. 5 a front view of the second operating state of the fitting part of the hand tool of the invention, Fig. 6 a front view of the third operating state of the fitting part of the hand tool of the invention, Fig. 7 is a front view of the fourth operating state of the fitting part of the hand tool of the invention, Fig. 8 is a perspective view of the second embodiment of the fitting part of the hand tool of the invention, Fig. 9 is a perspective view of the third embodiment of the fitting part of the hand tool of the invention, Fig. 10 is a front view of the fourth embodiment of the fitting part of the hand tool of the invention, Fig. 11 is a front view of the fifth embodiment of the fitting part of the hand tool of the invention, Fig. 12 is a front view of the sixth embodiment of the fitting part of the hand tool of the invention, Fig. 13 is a front view of the seventh embodiment of the fitting part of the hand tool of the invention, Fig. 14 is a front view of the eighth embodiment of the fitting part of the hand tool of the invention, Fig. 15 is a front view of the ninth embodiment of the fitting part of the hand tool of the invention, Fig. 16 is a front view of the tenth embodiment of the fitting part of the hand tool of the invention. Implementation of the invention
[0007] On Fig. 1 to 3 are referred to. Fig. 1 shows a perspective view of the fitting part of the hand tool of the invention, Fig. 2 shows a front view of the fitting part of the hand tool of the invention, and Fig. Figure 3 shows a front view of the hand tool fitting part of the invention. The invention relates to a hand tool fitting part comprising: a main body 10 having a fitting part 11, the fitting part 11 having three first drive sections 12, three second drive sections 13, and six receiving sections 14, the three first drive sections 12 and the three second drive sections 13 being arranged alternately in a ring shape, each receiving section 14 being located between a first drive section 12 and a second drive section 13, and the main body 10 being a ring wrench or the main body 10 being a fitting part of a hand tool; wherein each first drive section 12 has a first surface 121 and a second surface 122, wherein the first surface 121 and the second surface 122 are flat, wherein a first intersection line 123 is formed at the intersection of the first surface 121 and the second surface 122, ie the first surface 121 and the second surface 122 intersect on a straight line; wherein the first drive section 12 is provided with a first groove 124, wherein the first groove 124 lies in the region of the first surface 121, wherein the first groove 124 has a first side wall 1241 and two second side walls 1242, wherein the first side wall 1241 and the two second side walls 1242 form a U-shaped groove, wherein the first side wall 1241 and the second side walls 1242 are flat, wherein the first side wall 1241 is located on the floor and the two second side walls 1242 are located on the two sides of the first side wall 1241, wherein two second cutting lines 1243 are formed at the intersection of the first groove 124 and the first surface 121, and wherein the two second cutting lines 1243 are parallel to each other and parallel to the first cutting line 123; wherein the first drive section 12 is provided with a second groove 125, wherein the second groove 125 lies in the region of the second surface 122, wherein the second groove 125 has a third side wall 1251 and two fourth side walls 1252, wherein the third side wall 1251 and the two fourth side walls 1252 form a U-shaped groove, wherein the third side wall 1251 and the fourth side walls 1252 are flat, wherein the third side wall 1251 is located on the floor and the two fourth side walls 1252 are located on the two sides of the third side wall 1251, wherein one of the fourth side walls 1252 coincides with the first cutting line 123, wherein a third cutting line 1253 is formed at the intersection of the second groove 125 and the second surface 122, iethe second groove 125 and the second surface 122 intersect on the first intersecting line 123 and the third intersecting line 1253, the third intersecting line 1253 being parallel to the first intersecting line 123 and also parallel to the second intersecting line 1243;. wherein the second groove 125 has the same shape and structure as the first groove 124, wherein a gap is present between the second groove 125 and the first groove 124, wherein the dimension of the third side wall 1251 is the same as that of the first side wall 1241, and wherein the dimension of the fourth side wall 1252 is the same as that of the second side wall 1242; wherein each second drive section 13 has a third surface 131, the third surface 131 being flat; wherein each receiving portion 14 has the shape of a concave arcuate surface, wherein each receiving portion 14 is located between a first drive portion 12 and a second drive portion 13, wherein the receiving portion 14 defines a first ellipse 141, wherein the receiving portion 14 is non-tangential to the first surface 121, the second surface 122 and the third surface 131; wherein, viewed two-dimensionally, a first circle center 15 is formed in the center axis of the fitting part 11, wherein the first circle center 15 forms a first circle 151, wherein each first surface 121 is tangent to the first circle 151, wherein the first circle 151 defines a first hexagon 152, wherein each first surface 121 coincides with a side surface of the first hexagon 152, wherein the first circle center 15 defines a first vertical line 153, wherein the first surface 121 is vertical to the first vertical line 153, wherein the first surface 121 is located on both sides of the first vertical line 153, wherein the first groove 124 is located on one side of the first vertical line 153, wherein the second surface 122, the first intersection line 123, the third intersection line 1253 and the second groove 125 are on the other side of the first vertical line 153, wherein the first hexagon 152 has six first corners 154,and wherein the receiving portion 14 lies outside the first corner 154; and, wherein two opposite side surfaces of the first hexagon 152 have a first distance 155, wherein a first angle 156 is formed between the second surface 122 and the first surface 121, wherein the first angle 156 is not greater than 15 degrees, or the first angle 156 is between 5 degrees and 10 degrees, wherein the first corners of the first hexagon 152 have a second distance 157, wherein the first corner 154 and the first intersection line 123 have a third distance 158, wherein the first intersection line 123 and the other first corner 154 have a fourth distance 159, wherein the value of the third distance 158 plus the value of the fourth distance 159 is equal to the value of the second distance 157, and the ratio of the third distance 158 and the fourth distance 159 is 6:4 or almost 6:4, wherein between the first surface 121 and the fourth side wall 1252 a second angle 1591 is formed, wherein the second angle 1591 is less than 180 degrees,wherein the third surface 131 and the side surface of the hexagon 152 have a fifth distance 1592, the fifth distance 1592 being 0, which means that the third surface 131 coincides with the side surface of the first hexagon 152.,
[0008] Fig. 4 shows a front view of the first operating state when rotating the first screw element 20 of the fitting part of the hand tool of the invention. From the figure, it can be clearly seen that when the main body 10 rotates the first screw element 20 clockwise, each first surface 121 and each third surface 131 abuts a side surface of the first screw element 20. When the first surface 121 abuts the side surface of the first screw element, the second surface 122 is spaced from the side surface of the first screw element 20. The six corners of the first screw element 20 are received in the six receiving portions 14. When the fitting part 11 rotates the first screw element 20, the receiving portions 14 can prevent wear of the corners of the first screw element 20.
[0009] Fig. 5 shows a front view of the second operating state when rotating the first screw element 20 of the fitting part of the hand tool of the invention. It can be clearly seen from the figure that when the main body 10 rotates the first screw element 20 counterclockwise, the second surfaces 122 or the first cutting lines 123 or the third cutting lines 1253 abut against three side surfaces of the first screw element 20 because the first screw element 20 has tolerances. The six corners of the first screw element 20 are received in the receiving portions 14. The six receiving portions 14 can prevent wear of the corners of the first screw element 20.
[0010] Fig. 6 shows a front view of the third operating state when rotating the first screw element 20 of the fitting part of the hand tool of the invention. From the figure, it can be clearly seen that the hexagonal first screw element 20 is worn and rounded. When the main body 10 rotates the first screw element 20 counterclockwise, the first cutting line 123 can abut against the side surface of the first screw element 20. The first cutting line 123 forms a linear contact and can be used as a force application point for rotating the first screw element 20, whereby the first screw element 30 with rounded corners can be easily loosened through the first cutting line 123, so that the fitting part 11 can easily unscrew the first screw element 20 with rounded corners.
[0011] Fig. Figure 7 shows a front view of the fourth operating state when rotating the first screw element 20 of the fitting part of the hand tool of the invention. The six corners of a second screw element 30 are received in the receiving sections 14. The second screw element 30 is a star-shaped screw element.
[0012] Fig. Figure 8 shows a perspective view of the second embodiment of the fitting part of the hand tool of the invention. The main body 10 is a ratchet structure, and the ratchet structure is arranged on a ratchet wrench.
[0013] Fig. Figure 9 shows a perspective view of the third embodiment of the fitting part of the hand tool of the invention. The main body 10 is a socket.
[0014] Fig. 10 shows a front view of the fourth embodiment of the fitting part of the hand tool of the invention. In this embodiment, the main body 10 is an open-end wrench. The number of the first drive portion 12 and the second drive portion 13 is two each. The number of the receiving portion 14 is five. The two first drive portions 12 and the two second drive portions 13 are arranged alternately on the four surfaces of the fitting part 11.
[0015] Fig. Figure 11 shows a front view of the fifth embodiment of the fitting part of the hand tool of the invention. In this embodiment, the main body 10 is an open-end wrench. The number of the first drive portion 12 and the second drive portion 13 is one each. The number of the receiving portion 14 is two. The first drive portion 12, the second drive portion 13, and the receiving portions 14 are arranged on two opposite surfaces of the fitting part 11.
[0016] Fig. Figure 12 shows a front view of the sixth embodiment of the hand tool fitting of the invention. In this embodiment, the first groove 124 has a triangular shape, or the first groove 124 has an isosceles triangular shape.
[0017] Fig. Figure 13 shows a front view of the seventh embodiment of the hand tool fitting of the invention. In this embodiment, the first groove 124 and the second groove 125 both have a semicircular shape.
[0018] Fig. Figure 14 shows a front view of the eighth embodiment of the fitting part of the hand tool of the invention. In this embodiment, each second drive section 13 has two third grooves 132. The two third grooves 132 are appropriately spaced. The two grooves 132 are symmetrical about the first vertical line 153.
[0019] Fig. Figure 15 shows a front view of the ninth embodiment of the fitting part of the hand tool of the invention. In this embodiment, the second drive portion 13 has a plurality of third grooves 132. The number of third grooves 132 is three. The third grooves 132 have different shapes. The third grooves 132 can have a triangular or semicircular shape. The third grooves 132 are connected to each other.
[0020] Fig. Figure 16 shows a front view of the tenth embodiment of the hand tool fitting of the invention. In this embodiment, every third surface 131 can be located outside the side surface of the first hexagon 152, i.e., the fifth distance 1592 is greater than 0, thereby providing a larger tolerance during turning. Likewise, the third surface 131 can be located inside the side surface of the first hexagon 152.
[0021] The fitting part of hand tools of this invention has the following advantages: 1. As in Fig. As shown in Figure 4, when the main body 10 rotates the first screw member 20 clockwise, the three first surfaces 121 form the main force application points. The first surfaces 121 have the largest area for rotating the first screw member 20. The three third surfaces 131 form the second force application points. The third surfaces 131 also have a large area for rotating the first screw member 20. When the main body 10 is rotated, it has the main force application points and the second force application points. When the main body 10 rotates the first screw member 20, the six side surfaces of the first screw member 20 are less likely to be worn. 2. As in Fig. As shown in Figure 5, when the main body 10 rotates the first screw element 20 counterclockwise, the second surfaces 122 or the first cutting lines 123 or the third cutting lines abut three side surfaces of the first screw element 20. They form the main force application points. The third surfaces 131 abut the other three side surfaces of the first screw element 20. They form the second force application points. When the main body 10 rotates the first screw element, the six side surfaces of the first screw element 20 are less likely to be worn. 3. As in Fig. 6, when the six side surfaces of the first screw element 20 are worn and rounded, the three first cutting lines 123 abut the remaining side surfaces of the first screw element 20. The first cutting lines 123 act as concentrated force application points to loosen the first worn and rounded screw element 20. As shown in Fig. 3, the first cutting line 123 is quite close to the first vertical line 153. Therefore, when the first screw element 20 is heavily worn and rounded, the three first cutting lines 123 can still turn the first screw element 20. 4. As mentioned in points 1-3, the main body 10 has main force application points and secondary force application points when tightening the first screw element 20 clockwise and when loosening the first screw element 20 counterclockwise. When the first screw element 20 is rounded, the first cutting lines 123 can abut against three side surfaces of the first screw element 20. The first cutting lines 123 have the effect of concentrated force application points. The fitting part 11 has the function of rotating the first screw element 20 and the first rounded screw element 20. There are three rotation modes between the fitting part 11 and the first screw element 20. The main body 10 has a better rotation effect. 5. The first surface 121, the second surface 122, and the third surface 131 are flat. When turned, the first surface 121, the second surface 122, and the third surface 131 do not produce bite marks on the first screw element 20. 6. The second drive section 13 retains the conventional structure. Most of the screw elements are as shown in Fig. 4 and Fig. 5. The second drive section 13 can be used in the conventional manner. By adding the first drive section 12, the fitting part 11 can have additional functions. 7. The first drive section 12 and the second drive section 13 have different structures. The first surface 121 and the first hexagon 152 overlap. The third surface 131 and the first hexagon have a fifth distance 1592. For the first screw element 20 of Specification 19, the upper limit is approximately 18.97 mm and the lower limit is approximately 18.50 mm. Since the first drive section 12 and the second drive section 13 have different structures, they are applicable to the first screw element 20 with tolerances. 8. As mentioned above, there is no big difference when the first screw element is rotated clockwise, but when it is rotated counterclockwise and the third surface 131 is outside the first hexagon 152, the second surface 122 has a higher probability of rotating the first screw element 20 if the screw element 20 is close to the upper limit. 9. As in Fig. 3, a second angle 1591 is formed between the first surface 121 and the fourth side surface 1252, and the third angle 1591 is less than 180 degrees, that is, the third angle 1591 is in the form of an acute angle. The third intersection line 123 can form a concentrated force application point for rotating the first screw element 20 to rotate a rounded first screw element 20. 10. When rotating, the six corners of the first screw member 20 are located in the receiving sections 14. The six receiving sections 14 have a concave arc shape to prevent the six corners of the first screw member 20 from being worn. 11. The receiving portion 14 has a concave arc shape and defines a first ellipse 141. The main body 10 can rotate the second screw element 30. The fitting part 11 can rotate the first screw element 20 and the second screw element 30, thereby expanding the application range of the main body 10. List of reference symbols 10 main bodies 11 Fitting part 12 first drive section 121 first area 122 second area 123 first cutting line 124 first groove 1241 first side wall 1242 second side wall 1243 second cutting line 125 second groove 1251 third side wall 1252 fourth side wall 1253 third cutting line 13 second drive section 131 third area 132 third groove 14 Recording section 141 first ellipse 15 first circle center 151 first circle 152 first hexagon 153 first vertical line 154 first corner 155 first distance 156 first angle 157 second distance 158 third distance 159 fourth distance 1591 second angle 1592 fifth distance 20 first screw element 30 second screw element
Claims
[1] Fitting part of hand tool, which includes: a main body (10) having a fitting part (11), the fitting part (11) having three first drive sections (12), three second drive sections (13) and six receiving sections (14), the three first drive sections (12) and the three second drive sections (13) being arranged alternately in a ring shape, each receiving section (14) being located between a first drive section (12) and a second drive section (13); wherein each first drive section (12) has a first surface (121) and a second surface (122), wherein the first surface (121) and the second surface (122) are flat, wherein a first intersection line (123) is formed at the intersection of the first surface (121) and the second surface (122), ie the first surface (121) and the second surface (122) intersect on a straight line; wherein the first drive section (12) is provided with a first groove (124), wherein the first groove (124) lies in the region of the first surface (121), wherein the first groove (124) has a first side wall (1241) and two second side walls (1242), wherein the first side wall (1241) and the two second side walls (1242) form a U-shaped groove, wherein the first side wall (1241) and the second side walls (1242) are flat, wherein the first side wall (1241) is located on the floor and the two second side walls (1242) are located on the two sides of the first side wall (1241), wherein two second cutting lines (1243) are formed at the intersection of the first groove (124) and the first surface (121), and wherein the two second cutting lines (1243) are parallel to each other and parallel to the first cutting line (123); wherein the first drive section (12) is provided with a second groove (125), wherein the second groove (125) lies in the region of the second surface (122), wherein the second groove (125) has a third side wall (1251) and two fourth side walls (1252), wherein the third side wall (1251) and the two fourth side walls (1252) form a U-shaped groove, wherein the third side wall (1251) and the fourth side walls (1252) are flat, wherein the third side wall (1251) is located on the floor and the two fourth side walls (1252) are located on the two sides of the third side wall (1251), wherein one of the fourth side walls (1252) coincides with the first cutting line (123), wherein a third intersection line (1253) is formed at the intersection of the second groove (125) and the second surface (122), ie the second groove (125) and the second surface (122) intersect on the first intersection line (123) and the third intersection line (1253), the third intersection line (1253) being parallel to the first intersection line (123) and also parallel to the second intersection line (1243); wherein the second groove (125) has the same shape and structure as the first groove (124), wherein a gap is present between the second groove (125) and the first groove (124), wherein the dimension of the third side wall (1251) is the same as that of the first side wall (1241), and wherein the dimension of the fourth side wall (1252) is the same as that of the second side wall (1242); wherein each second drive section (13) has a third surface (131), the third surface (131) being flat; wherein each receiving section (14) has the shape of a concave arcuate surface, wherein each receiving section (14) is located between a first drive section (12) and a second drive section (13); wherein, viewed two-dimensionally, a first circle center (15) is formed in the center axis of the fitting part (11), wherein the first circle center (15) forms a first circle (151), wherein each first surface (121) is tangent to the first circle (151), wherein the first circle (151) defines a first hexagon (152), wherein each first surface (121) coincides with a side surface of the first hexagon (152), wherein the first circle center (15) defines a first vertical line (153), wherein the first surface (121) is vertical to the first vertical line (153), wherein the first surface (121) is located on both sides of the first vertical line (153), wherein the first groove (124) is located on one side of the first vertical line (153), wherein the second surface (122), the first intersection line (123), the third intersection line (1253) and the second groove (125) is located on the other side of the first vertical line (153),wherein the first hexagon (152) has six first corners (154), and wherein the receiving portion (14) lies outside the first corner (154); and, wherein two opposite side surfaces of the first hexagon (152) have a first distance (155), wherein a first angle (156) is formed between the second surface (122) and the first surface (121), wherein the first corners of the first hexagon (152) have a second distance (157), wherein the first corner (154) and the first intersection line (123) have a third distance (158), wherein the first intersection line (123) and the other first corner (154) have a fourth distance (159), wherein the value of the third distance (158) plus the value of the fourth distance (159) is equal to the value of the second distance (157), wherein a second angle (1591) is formed between the first surface (121) and the fourth side wall (1252), and wherein the third surface (131) and the side surface of the hexagon (152) have a fifth distance (1592) have. [2] Fitting part of hand tool according to claim 1, characterized bythat the main body (10) is a ring spanner or the main body (10) is a fitting part of a hand tool or the main body (10) has a ratchet structure and the ratchet structure is arranged on a ratchet wrench or the main body is a socket, wherein the number of the first drive section (12) and the second drive section (13) is two each and the number of the receiving section (14) is five, wherein the two first drive sections (12) and the two second drive sections (13) are arranged alternately on the four surfaces of the fitting part (11), or the main body (10) is an open-end wrench, wherein the number of the first drive section (12) and the second drive section (13) is one each, wherein the number of the receiving section (14) is two, and wherein the first drive section (12), the second drive section (13) and the receiving sections (14) are arranged on two opposite surfaces of the fitting part (11). [3] Fitting part of hand tool according to claim 1, characterized by that the receiving portion (14) defines a first ellipse (141), wherein the receiving portion (14) is not tangent to the first surface (121), the second surface (122) and the third surface (131). [4] Fitting part of hand tool according to claim 1, characterized by that the first angle (156) is not greater than 15 degrees, or the first angle (156) is between 5 degrees and 10 degrees, and the ratio of the third distance (158) and the fourth distance (159) is 6:4 or almost 6:4, wherein the second angle (1591) is less than 180 degrees, wherein the fifth distance (1592) is 0, which means that the third surface (131) coincides with the side surface of the first hexagon (152). [5] Fitting part of hand tool according to claim 1, characterized bythat when the main body (10) rotates the first screw element (20) clockwise, each first surface (121) and each third surface (131) abuts a side surface of the first screw element (20), wherein when the first surface (121) abuts the side surface of the first screw element, the second surface (122) is spaced from the side surface of the first screw element (20), wherein the six corners of the first screw element (20) are received in the six receiving sections (14), wherein when the fitting part (11) rotates the first screw element (20), the receiving sections (14) can prevent wear of the corners of the first screw element (20), and when the main body (10) rotates the first screw element (20) counterclockwise, the second surfaces (122) or the first cutting lines (123) or the third cutting lines (1253) on three side surfaces of the first screw element (20) because the first screw element (20) has tolerances,wherein the six corners of the first screw element (20) are received in the receiving sections (14), wherein the six receiving sections (14) can prevent wear of the corners of the first screw element (20); and that when the hexagonal first screw element (20) is worn and rounded and the main body (10) rotates the first screw element (20) counterclockwise, the first cutting line (123) can abut the side surface of the first screw element (20), wherein the first cutting line (123) forms a linear contact and can be used as a force application point for rotating the first screw element (20), whereby the first screw element (30) with rounded corners can be easily loosened by the first cutting line (123), so that the fitting part (11 l) can easily unscrew the first screw element (20) with rounded corners. [6] Fitting part of hand tool according to claim 1, characterized bythat the six corners of a second screw element (30) are received in the receiving sections (14), wherein the second screw element (30) is a star-shaped screw element. [7] Fitting part of hand tool according to claim 1, characterized by that the first groove (124) has a triangular shape or the first groove has an isosceles triangular shape, or the first groove and the second groove (125) both have a semicircular shape. [8] Fitting part of hand tool according to claim 1, characterized by that each second drive section (13) has two third grooves (132), wherein the two third grooves (132) have an appropriate distance, and wherein the two grooves (132) are symmetrical to the first vertical line (153). [9] Fitting part of hand tool according to claim 1, characterized byin that the second drive section (13) has a plurality of third grooves (132), the number of third grooves (132) being three, the third grooves (132) having different shapes, the third grooves (132) being able to have a triangular or semicircular shape, and the plurality of third grooves being connected to one another. [10] Fitting part of hand tool according to claim 1, characterized by that every third surface (131) can lie outside the side surface of the first hexagon (152), ie the fifth distance (1592) is greater than zero, whereby there is a larger tolerance when turning, whereby the third surface (131) can also lie within the side surface of the first hexagon (152).