S-91255A525 1/4"-20 x 1 1/8" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional durability and corrosion resistance with Black-Oxide Alloy Steel construction, ideal for harsh industrial environments.
• High tensile strength of 120,000 psi ensures reliable performance under heavy loads and stress.
• Precise Class 3A thread fit provides superior engagement and vibration resistance in demanding applications.
• Secure and efficient installation with a 5/32" hex drive, minimizing tool slippage and damage.
• Fully threaded UNC coarse design allows for faster assembly and strong holding power.
• Compliance with ASME B18.3 and ASTM F835 standards guarantees consistent quality and engineering reliability.
• RoHS 3 and REACH compliant for safe, environmentally responsible use in global markets.

Professional Applications & Engineering Value

This 1/4"-20 UNC thread button head screw is engineered from Black-Oxide Alloy Steel to address common industrial challenges such as corrosion, high stress, and vibration loosening. The rounded head style and hex drive facilitate easy installation in tight spaces, while the coarse thread spacing and Class 3A thread fit ensure secure fastening in materials like metal and hardened plastics. Ideal for machinery, automotive, and equipment assembly, it provides long-lasting performance with Rockwell C39 hardness and full threading for maximum grip, reducing maintenance needs and downtime in professional settings.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with Class 3A fit for precise dimensional accuracy, and it is fully threaded for consistent performance. Manufactured in compliance with ASME B18.3 and ASTM F835 standards, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and reliability in industrial applications.