S-91274A208 1/4"-20 x 3" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-flake coating, ideal for harsh industrial environments
• High tensile strength of 170,000 psi ensures reliable performance under extreme loads
• Precise Class 3A thread fit for secure, vibration-resistant assemblies
• Rockwell C37 hardness provides excellent wear resistance and durability
• Partially threaded design allows for optimal clamping force and easy alignment
• Standard hex drive compatibility enables quick installation with common tools
• Compliance with major standards including ASME B18.3 and ASTM A574 guarantees quality and interchangeability

Professional Applications & Engineering Value

This zinc-flake-coated alloy steel socket head cap screw delivers exceptional performance in demanding applications where corrosion resistance and high strength are critical. The UNC coarse thread with Class 3A fit ensures rapid assembly and superior vibration resistance in machinery, automotive, and heavy equipment. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening while the hex socket drive provides reliable torque transmission in confined spaces. Engineered to withstand extreme conditions, this fastener maintains integrity in environments exposed to moisture, chemicals, and dynamic loads, making it ideal for industrial assembly applications requiring long-term reliability.

Specification Summary & Compliance

This socket head cap screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for precision assembly. Manufactured to ASME B18.3 dimensional specifications and ASTM A574 material standards, it ensures consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry requirements for hazardous substance restrictions.