S-91375A726 1/2"-13 x 4" ASME B18.3, ASTM F912 Set Screws
Set Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior holding power with Class 3A thread fit for precise, vibration-resistant fastening in demanding applications
- Exceptional durability from Rockwell C45 hardened black-oxide alloy steel, resisting wear and corrosion in industrial environments
- Reliable installation with 1/4" hex drive design, allowing high torque application without head protrusion for flush mounting
- Enhanced grip from cup tip design that creates positive seating and prevents component slippage under load
- Wide compatibility with 1/2"-13 UNC coarse threads, ensuring easy mating with standard components across various machinery
- Long-term performance backed by black-oxide surface treatment that provides additional corrosion resistance and reduced galling
- Regulatory compliance meeting major industrial standards for safe, reliable use in global markets
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical engineering solutions for industrial applications requiring maximum clamping force and positional security. The Class 3A thread fit provides tighter tolerances than standard fasteners, eliminating backlash in precision assemblies while the UNC coarse thread profile ensures rapid installation in high-volume production environments. The cup tip design concentrates pressure on a small contact area, creating exceptional resistance to rotational forces in pulley systems, gear hubs, and coupling applications. With Rockwell C45 hardness, this hex drive set screw maintains its mechanical properties under repeated stress cycles, making it ideal for heavy machinery, automotive components, and manufacturing equipment where vibration-induced loosening would compromise system integrity.
Specification Summary & Compliance
This 4" length set screw features precision 1/2"-13 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASME B18.3 specifications (ASTM F912) with black-oxide alloy steel construction and Rockwell C45 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and restricted substance management.
