Self-drilling self-tapping screw capable of locking nut

Abstract

A self-drilling self-tapping screw capable of locking a nut is provided with a screw head, a smooth section, a threaded section and a drill tail, the screw head, the smooth section, the threaded section and the drill tail are sequentially arranged, and the small diameter of the threaded section is 1.05-1.08 times of the diameter of the drill tail. According to the self-tapping self-tapping screw, the tail-shrinking type self-tapping structure is adopted, nut locking operation can be conducted after tapping, the fastening performance is improved, it can be guaranteed that the drill tail has enough strength, and a drill hole meeting the size requirement is formed.

Description

Technical Field

[0001] The utility model relates to a fastener, in particular to a self-drilling screw capable of locking a nut. Background Art

[0002] The drill tail self-drilling screw is a fastener with a drill tail and a thread, which is mainly used to fix building boards. The drill tail of the drill tail self-drilling screw is used to form a hole in the building board, and the thread is used for tapping operations, so that the drill tail self-drilling screw is fixed to the building board.

[0003] However, the existing self-drilling screws usually have a drill tail diameter larger than the minor diameter of the thread (i.e. the diameter of the thread bottom), and after drilling and tapping, the nut cannot be further locked, resulting in loosening and unreliable fixation when fixing multi-layer plates. In addition, although some self-drilling screws with pointed tails can lock the nut after drilling and tapping, the strength of the pointed tail is insufficient and cannot be applied to thick and hard plates. Utility Model Content

[0004] The technical solution of the utility model is aimed at the above situation. In order to solve the above problem, a self-drilling screw with a lockable nut is provided, which comprises a screw head, a smooth section, a threaded section and a drill tail, wherein the screw head, the smooth section, the threaded section and the drill tail are arranged in sequence, and the minor diameter of the threaded section is 1.05 to 1.08 times the diameter of the drill tail.

[0005] Furthermore, the diameter of the drill tail is 5.4-5.6 mm, and the minor diameter of the threaded section is 5.8-6 mm.

[0006] Furthermore, the major diameter of the threaded section is 7.2-7.4 mm.

[0007] Furthermore, the diameter of the smooth section is 7.9-8.1 mm, and the length of the smooth section is 54-55 mm.

[0008] Furthermore, the drill tail self-tapping screw also has a plurality of chip removal grooves, and the chip removal grooves extend from the bottom of the drill tail to the threaded section.

[0009] Furthermore, the self-drilling screw also has a flange, which is located between the screw head and the smooth section, and the diameter of the flange is greater than the diameter of the smooth section.

[0010] After adopting the above technical scheme, the beneficial effect of the utility model is: the drill tail self-tapping screw of the utility model adopts a shrinking drill tail structure, which can not only lock the nut after tapping to improve the tightness, but also ensure that the drill tail has sufficient strength and forms a drill hole that meets the size requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1The utility model is a schematic diagram of a self-drilling screw. DETAILED DESCRIPTION

[0012] The technical solution of the utility model is further described below by way of embodiments:

[0013] The utility model provides a self-drilling screw capable of locking a nut. Figure 1 As shown, the self-drilling screw has a screw head 1, a smooth section 2, a threaded section 3 and a drill tail 4, which are arranged in sequence, and the minor diameter d2 of the threaded section 3 is 1.05 to 1.08 times the diameter d1 of the drill tail 4. The minor diameter d2 of the threaded section 3 is the diameter of the bottom teeth of the thread.

[0014] When using the drill-tail self-tapping screw, the screw head 1 is used to cooperate with a screwdriver to perform the screwing operation; the smooth section 2 is used to pass through and support a plate with a hole (i.e., a splint); the threaded section 3 is used to tap the plate (i.e., a base plate) located on the bottom surface and to form a fixation with the plate; the drill tail 4 is used to drill a hole in the plate located on the bottom surface before tapping to form the prototype of the screw hole.

[0015] In the present invention, since the minor diameter d2 of the threaded segment 3 is larger than the diameter d1 of the drill tail 4, the threaded segment 3 can be locked with a nut after the tapping is completed to improve the tightness. In addition, since the minor diameter d2 of the threaded segment 3 is 1.05 to 1.08 times the diameter d1 of the drill tail 4, the drill tail 4 can be made too small, thereby ensuring that the drill tail has sufficient strength and ensuring that the borehole diameter is large enough for the subsequent tapping operation.

[0016] Specifically, the diameter d1 of the drill tail 4 is 5.4-5.6 mm, and the minor diameter d2 of the threaded section 3 is 5.8-6 mm.

[0017] More specifically, the major diameter d3 of the thread segment 3 is 7.2-7.4 mm, wherein the major diameter d3 of the thread segment 3 refers to the diameter of the top teeth of the thread.

[0018] More specifically, the diameter d4 of the smooth section 2 is 7.9-8.1 mm, and the length of the smooth section 2 is 54-55 mm. The smooth section 2 of the above length can enable the drill-tail self-tapping screw to clamp a plate with a large number of angles or thickness.

[0019] Specifically, the drill tail self-tapping screw also has a plurality of chip removal grooves 5, which extend from the bottom of the drill tail 4 to the threaded section 3. The chip removal grooves 5 can be provided to discharge debris during drilling and improve the fluency of drilling. In this embodiment, there are a plurality of chip removal grooves 5, and the plurality of chip removal grooves 5 are evenly arranged around the axis of the drill tail self-tapping screw.

[0020] Specifically, the self-drilling screw further has a flange 6, which is located between the screw head 1 and the smooth section 2, and the diameter of the flange 6 is greater than the diameter d4 of the smooth section 2. The flange 6 can be provided to press the plate tightly and prevent impurities from entering the through hole of the plate.

Claims

1. A self-drilling screw capable of locking a nut, comprising a screw head, a smooth section, a threaded section and a drill tail, wherein the screw head, the smooth section, the threaded section and the drill tail are arranged in sequence, and characterized in that: The minor diameter of the threaded section is 1.05 to 1.08 times the diameter of the drill tail.

2. The self-drilling screw with a lockable nut according to claim 1, characterized in that: The diameter of the drill tail is 5.4-5.6 mm, and the minor diameter of the threaded section is 5.8-6 mm.

3. The self-drilling screw with a lockable nut according to claim 2, characterized in that: The major diameter of the threaded section is 7.2-7.4 mm.

4. The self-drilling screw with a lockable nut according to claim 1, characterized in that: The diameter of the smooth section is 7.9-8.1 mm, and the length of the smooth section is 54-55 mm.

5. The self-drilling screw with a lockable nut according to claim 1, characterized in that: The drill tail self-tapping screw also has a plurality of chip removal grooves, and the chip removal grooves extend from the bottom of the drill tail to the thread section.

6. The self-drilling screw with a lockable nut according to claim 1, characterized in that: The self-drilling screw also has a flange, which is located between the screw head and the smooth section, and the diameter of the flange is greater than the diameter of the smooth section.

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