S-91274A212 1/4"-20 x 3 1/4" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc-flake coating, ensuring long-term reliability in harsh industrial environments.
• High tensile strength of 170,000 psi provides superior load-bearing capacity for demanding applications.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections with minimal risk of loosening.
• Rockwell C37 hardness offers excellent wear resistance and durability under repetitive stress.
• Hex drive design with 3/16" drive size allows for easy installation and high torque application in confined spaces.
• Compliance with ASME B18.3 and ASTM A574 standards ensures consistent quality and interchangeability.
• RoHS 3 and REACH compliant for environmentally responsible and safe use in global markets.

Professional Applications & Engineering Value

These 1/4"-20 UNC Socket Head Cap Screws are engineered to address critical challenges in heavy-duty assemblies where corrosion resistance and high tensile strength are paramount. The zinc-flake-coated alloy steel construction effectively combats rust and chemical exposure, making them ideal for outdoor machinery, automotive systems, and industrial equipment. With a coarse thread spacing and Class 3A thread fit, they provide rapid installation and reliable clamping force, reducing assembly time and maintenance costs. The partially threaded design and hex drive enable precise positioning and high-torque fastening in tight spaces, ensuring stable performance in vibration-prone environments. By meeting ASME B18.3 and ASTM A574 specifications, these screws deliver consistent dimensional accuracy and mechanical properties, enhancing the longevity and safety of your projects.

Specification Summary & Compliance

This product features a 1/4"-20 UNC thread with Class 3A thread fit for precise engagement and coarse thread spacing for efficient installation. Dimensions include a 3/16" hex drive size, 3/8" head diameter, and 3 1/4" length with a minimum thread length of 1". It complies with ASME B18.3 and ASTM A574 manufacturing standards, and is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to environmental and safety regulations.