S-91274A032 6-32 x 1 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, ideal for harsh industrial environments and extending service life.
• Superior strength and reliability from alloy steel construction, offering a high tensile strength of 170,000 psi for demanding applications.
• Precise and secure fastening ensured by the Class 3A thread fit, minimizing the risk of loosening under vibration.
• Optimized for high-torque installation with a standard hex socket (7/64" drive), allowing for efficient assembly and disassembly.
• Versatile partial threading provides an unthreaded shank for precise alignment and shear strength where needed.
• Guaranteed dimensional consistency through compliance with ASME B18.3 and ASTM A574 standards.
• Enhanced durability with a Rockwell C37 hardness, resisting wear and deformation under load.

Professional Applications & Engineering Value

This 6-32 UNC Socket Head Cap Screw is engineered to solve critical fastening challenges in industrial machinery, automotive assemblies, and heavy-duty equipment. The zinc-flake-coated alloy steel construction provides a robust barrier against corrosion, significantly outperforming standard platings in saline or chemically aggressive environments. Its coarse thread spacing (UNC) and Class 3A thread fit ensure rapid assembly and a vibration-resistant hold, reducing maintenance downtime. The partially threaded design offers a non-threaded bearing surface, ideal for applications requiring precise component alignment and increased resistance to shear forces. This combination of material, thread form, and high tensile strength makes it a reliable choice for engineers seeking long-term performance and failure prevention in critical joints.

Specification Summary & Compliance

This screw features a 6-32 UNC thread with a Class 3A fit for precision and a coarse thread spacing. It is manufactured from alloy steel to the dimensional requirements of ASME B18.3 and the material specification of ASTM A574. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. It has also been tested per ASTM B117 for corrosion resistance, ensuring it meets stringent industry standards for quality and environmental safety.