Self-Drilling Fastener Grooves for Lower Torque Installation

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Solution Overview

Problem

DIY users face challenges with self-drilling screws due to limited access to professional power tools, increased torque demands, prolonged drive times, and risk of substrate splitting, particularly in woodworking and roofing applications.

Innovation Solution

A fastener design featuring a self-drilling tip with parallel grooves and a debris clearing portion, a hexagonal drive portion, and a zinc-nickel coating, which reduces drive torque, minimizes substrate splitting, and enhances precision and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If self-drilling screws are used without pilot holes, then installation speed is improved, but drive torque requirements increase

Engineering Contradiction:

Improveinstallation speedVSAvoiddrive torque requirements

Core Design Contradiction:

ProductivityVSPower

Solution Approach 1:

The distal portion of the shank is segmented into multiple parallel grooves that divide the cutting action into separate zones. This segmentation reduces the concentrated torque demand at the tip by distributing the cutting load across multiple grooves, enabling faster installation with lower-powered tools while maintaining the self-drilling capability.

Inventive Principle:

Principle #1Segmentation

2Strength

If dense thread pitch is used for roofing applications, then wind load resistance is improved, but drive time increases

Engineering Contradiction:

Improvewind load resistanceVSAvoiddrive time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The parallel grooves in the distal portion create multiple independent cutting paths that work simultaneously during installation. This segmented approach allows the fastener to engage the substrate more efficiently, reducing the total drive time required to achieve the necessary wind load resistance through the dense thread pitch.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The continuous parallel grooves maintain constant cutting engagement throughout the driving process, ensuring that the dense thread pitch is fully engaged with the substrate from the start. This continuous action reduces interruptions and drive time while maintaining the strength required for wind load resistance.

Inventive Principle:

Principle #20Continuity of useful action

3Ease of operation

If self-drilling screws are used in timber structures, then installation simplicity is improved, but substrate splitting risk increases

Engineering Contradiction:

Improveinstallation simplicityVSAvoidsubstrate splitting risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The parallel grooves in the distal portion create multiple narrow cutting paths that disperse the cutting forces across different zones of the substrate. This segmentation prevents concentrated stress that would cause splitting, while maintaining the simplicity of direct installation without pilot holes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The grooves are specifically positioned and configured in the distal portion of the shank where the cutting action occurs, while the rest of the shank maintains its threaded structure for engagement. This localized modification addresses the splitting issue at the critical entry point without compromising the overall fastening function.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20260071644A1fastener

Publication Date: 2026.03.12 ILLINOIS TOOL WORKS INC

AI summary

A fastener comprising a head and a shank that terminates in a self-drilling tip, the shank including a distal portion that is spaced away from the head and includes the self-drilling tip, wherein the distal portion is provided with a pair of offset grooves that define respective cutting faces of the fastener.