---
publication_id: "OT-2026-000003176"
title: "Spiral drive system for threaded fasteners"
published_at: "2026-09-15T19:44:12.962458Z"
canonical_url: "https://opentechnical.org/p/OT-2026-000003176"
categories:
  - "tools-tooling/clamping-tools"
keywords:
  - "b25b15/005"
  - "b25b15/005"
  - "b25b15/005"
  - "b21k1/46"
  - "b21k1/463"
  - "b21k1/463"
---

# Spiral drive system for threaded fasteners

## Abstract

A spiral drive system for threaded fasteners includes driver-engageable surfaces on the head end of the fastener in which at least some of the driver-engageable surfaces are defined by a spiral segment configured to maximize torque transmission while spreading the driving load over a broad driver-fastener interface to reduce the risk of development of high stress regions. Drivers and related tooling also are disclosed.

## 1. Drawings

[0001] Sheet 1.

[0002] Sheet 2.

[0003] Sheet 3.

[0004] Sheet 4.

[0005] Sheet 5.

[0006] Sheet 6.

[0007] Sheet 7.

[0008] Sheet 8.

[0009] Sheet 9.