S-90910A531 1/4"-20 x 1" ASME B18.3, ASTM F835 Steel Button Head Torx Plus Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated alloy steel construction, extending service life in harsh industrial environments.
• Enhanced torque transmission and reduced cam-out thanks to the Torx Plus (IP27/T27) drive, ensuring secure fastening and minimizing tool wear.
li>High-strength reliability with a Rockwell C39 hardness and 120,000 psi tensile strength, designed for demanding heavy-duty applications.
• Precise and secure thread engagement with Class 3A UNC coarse threads, providing excellent vibration resistance and assembly consistency.
• Streamlined, low-profile design of the rounded button head for a clean finish and reduced snagging in confined spaces.
• Full threading for maximum grip along the entire 1" length, offering versatile clamping force across various material thicknesses.
• Guaranteed compliance and safety by meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards, ensuring regulatory acceptance.

Professional Applications & Engineering Value

This 1/4-20 Torx Plus zinc-plated alloy steel rounded head screw is engineered to solve critical challenges in industrial assembly and machinery. The zinc plating provides a durable barrier against corrosion, essential for equipment exposed to moisture or chemicals. Its Torx Plus drive system (IP27/T27) delivers higher torque transfer with minimal slippage, preventing fastener damage and reducing assembly time in automated or high-volume production lines. The Class 3A thread fit with UNC coarse spacing ensures quick installation and reliable performance in vibrating environments, such as automotive components, heavy machinery, and structural frameworks. Combined with full threading and a rounded button head profile, it offers a secure, low-profile fastening solution that enhances both mechanical integrity and aesthetic appeal in professional settings.

Specification Summary & Compliance

This screw features precise Class 3A thread fit with UNC coarse thread spacing, ensuring dimensional accuracy per industry standards. It is manufactured in compliance with ASME B18.3 and ASTM F835 specifications, guaranteeing consistent quality and performance. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations for global industrial use.