S-91274A084 8-32 x 1 3/4" 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 on alloy steel, ideal for harsh industrial environments
• High tensile strength of 170,000 psi ensures reliable performance in heavy-duty applications
• Precise Class 3A thread fit provides superior engagement and vibration resistance
• Rockwell C37 hardness delivers excellent durability and wear resistance
• Standard hex drive design allows for easy installation with common tools
• Compliance with ASME B18.3 and ASTM A574 guarantees consistent quality and interchangeability
• RoHS 3 and REACH compliance ensures environmental and regulatory safety

Professional Applications & Engineering Value

These 8-32 UNC socket head cap screws are engineered to address critical fastening challenges in demanding sectors such as machinery assembly, automotive systems, and industrial equipment. The zinc-flake-coated alloy steel construction provides outstanding corrosion resistance, extending service life in humid or chemically aggressive settings. With a coarse thread spacing and Class 3A thread fit, they offer rapid installation and secure locking, reducing the risk of loosening under dynamic loads. The partially threaded rod design allows for precise clamping force distribution, making them ideal for applications where vibration resistance and high tensile strength are paramount. Their compliance with ASME B18.3 ensures dimensional accuracy and reliability in OEM and MRO operations.

Specification Summary & Compliance

This screw features a UNC thread type with Class 3A thread fit for precise tolerance, a 9/64" hex drive, and a 1-3/4" length with 7/8" minimum thread length. It meets ASME B18.3 and ASTM A574 specifications for manufacturing consistency, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards.