S-91385A361 5/16"-24 x 1/2" 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
- Permanent vibration resistance with Nylon Patch locking that maintains secure fastening in dynamic environments
- Superior corrosion protection through Black-Oxide coating, extending service life in industrial conditions
- Exceptional holding power from the cup point design that bites into surfaces for non-slip performance
- Precision fit and reliability with Class 3A UNF fine threads ensuring tight tolerances and minimal backlash
- High-strength durability from Rockwell C45 hardened alloy steel, resisting wear and deformation under load
- Wide temperature compatibility with thread locker performing from -50°F to 250°F for extreme environment applications
- Space-saving installation using the headless hex drive design, ideal for confined assemblies
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Set Screw delivers critical performance in demanding mechanical systems where vibration loosening and positional accuracy are primary concerns. The Nylon Patch locking element provides permanent resistance to rotational forces, eliminating the need for secondary locking devices in industrial machinery, automotive components, and precision equipment. Engineered with Class 3A UNF fine threads, it ensures superior engagement and clamping force in threaded holes, while the cup point creates positive seating on shafts and collars. The combination of Rockwell C45 hardness and temperature-stable locking makes it particularly valuable for high-stress assemblies exposed to thermal cycling, from motor mounts to production tooling.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit for precision UNF fine threading (5/16"-24). The Black-Oxide Alloy Steel construction meets Rockwell C45 hardness standards, while the Nylon Patch locking functions across -50°F to 250°F. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use in regulated industries.
