S-91251A258 10-24 x 4 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi for reliable performance in high-stress industrial applications
• Superior corrosion resistance from the black-oxide coating, extending service life in harsh environments
• Precise Class 3A thread fit ensures secure, vibration-resistant fastening with minimal risk of loosening
• Partially threaded design allows for optimal clamping force distribution and easier alignment in assemblies
• High hardness rating (Rockwell C37) provides excellent wear resistance and durability under repeated use
• Coarse UNC threading enables quick installation and removal, reducing assembly time and labor costs
• Hex socket drive offers superior torque transmission and access in confined spaces

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these black-oxide alloy steel socket head cap screws deliver critical performance advantages where failure is not an option. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures these fasteners withstand extreme mechanical stresses in heavy machinery, automotive assemblies, and precision equipment. The black-oxide surface treatment provides essential corrosion protection while maintaining dimensional stability. The 10-24 UNC coarse thread with Class 3A fit guarantees precise engagement in tapped holes, eliminating play and maintaining alignment in vibration-prone applications. The partially threaded configuration concentrates clamping force exactly where needed, preventing joint distortion while the hex socket drive enables high-torque installation in space-constrained assemblies.

Specification Summary & Compliance

These socket head cap screws feature precision 10-24 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufacturing complies with ASTM A574 specification for alloy steel socket head cap screws, ensuring consistent quality and performance. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications with strict material restrictions.