S-91404A542 1/4"-20 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Easy hand-tightening without tools thanks to the large 1 3/8" wing head design for rapid assembly and disassembly.
• Superior corrosion resistance from the zinc-plated iron construction, extending service life in various industrial environments.
• Reliable and quick engagement with the 1/4"-20 UNC coarse thread, designed for efficient fastening in a wide range of materials.
• Consistent thread quality and fit ensured by the Class 2A thread fit, reducing cross-threading and ensuring secure connections.
• Maximum grip along the entire length due to the screw being fully threaded, providing uniform holding power.
• Compliance with major environmental regulations including RoHS 3 and REACH, making it suitable for global supply chains and sensitive applications.
• Durable and robust construction with precise head diameter and height tolerances for dependable performance in heavy-duty use.

Professional Applications & Engineering Value

This zinc-plated iron thumb screw is engineered to solve common industrial challenges such as the need for quick, tool-free adjustments and corrosion resistance in demanding environments. The wing head design provides an ergonomic grip, reducing operator fatigue during frequent maintenance or assembly tasks in machinery, electrical enclosures, and jig fixtures. Its 1/4"-20 UNC coarse thread and Class 2A thread fit ensure easy starts and secure fastening, minimizing the risk of stripping in soft materials or misalignment. Fully threaded for consistent clamping force, this industrial thumb screw is ideal for applications where speed, reliability, and compliance with environmental standards like RoHS and REACH are critical for operational efficiency and safety.

Specification Summary & Compliance

This thumb screw adheres to precise dimensional standards, including a head diameter tolerance of -0.0156" to 0.0156" and a Class 2A thread fit for consistent performance. It features UNC coarse threading with a right-hand thread direction and is fully threaded for maximum utility. The product is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for industrial use.