S-91251A158 6-32 x 1 3/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in critical assemblies.
• Superior corrosion resistance from the black-oxide finish prolongs service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
• High Rockwell C37 hardness provides excellent wear resistance, maintaining thread integrity through repeated installation and removal cycles.
• Hex socket drive design allows for high-torque application with standard 7/64" tools, enabling efficient installation in confined spaces.
• Partially threaded shank offers optimal grip length control, preventing over-tightening and ensuring consistent clamping force distribution.
• Full regulatory compliance with ASTM A574, RoHS 3, and REACH standards ensures environmental safety and meets global quality requirements for industrial applications.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 6-32 UNC socket head cap screws deliver exceptional performance where reliability is paramount. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the 170,000 psi tensile strength needed for high-stress applications. The coarse UNC threads with Class 3A fit ensure rapid assembly and vibration resistance in machinery, automotive, and heavy equipment applications. The partially threaded design allows for precise clamping force control, while the hex socket drive enables high-torque installation in space-constrained assemblies. These industrial-grade fasteners solve common engineering challenges including corrosion-induced failure, thread stripping, and assembly inconsistency.

Specification Summary & Compliance

This socket head cap screw features precise 6-32 UNC coarse threads with Class 3A thread fit for superior engagement and dimensional accuracy. The fastener meets ASTM A574 manufacturing specifications for high-strength socket head cap screws and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. With a 1 3/4" length and 3/4" minimum thread length, it maintains consistent performance across industrial applications requiring reliable, high-strength fastening solutions.