S-91375A125 5-40 x 5/16" 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
- Enhanced corrosion resistance through black-oxide surface treatment, extending service life in demanding environments
- Superior thread engagement with Class 3A thread fit ensuring precise, vibration-resistant fastening in critical assemblies
- Exceptional mechanical strength from Rockwell C45 hardened alloy steel construction, preventing deformation under high stress
- Secure tamper-resistant installation via 1/16" hex drive in headless design, ideal for confined spaces and permanent applications
- Optimized load distribution with cup tip design that minimizes surface damage while maintaining strong clamping force
- Reliable coarse threading (UNC) for rapid installation and reduced cross-threading risks in production environments
- Full regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial acceptance
Professional Applications & Engineering Value
Engineered for precision industrial set screws applications, this black-oxide alloy steel fastener addresses critical challenges in machinery assembly and component positioning. The Class 3A thread fit maintains tight tolerances in vibrating systems, while the cup tip design prevents shaft damage during high-torque installation. The headless configuration with 1/16" hex drive enables flush mounting in space-constrained assemblies, particularly valuable in automotive, aerospace, and manufacturing equipment where corrosion resistant set screws are essential for long-term reliability. The combination of Rockwell C45 hardness and coarse thread spacing ensures consistent performance in high-cycle production environments where fastener integrity directly impacts operational safety.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and UNC coarse threading (5-40). Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification includes black-oxide alloy steel with Rockwell C45 hardness verification, ensuring consistent mechanical properties across production batches.
