S-91375A570 1/4"-28 x 2 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
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Exceptional thread precision with Class 3A fit ensures secure, vibration-resistant fastening in critical assemblies
- High-strength alloy steel construction with Rockwell C45 hardness provides reliable performance under heavy loads
- Space-saving headless design with hex socket drive allows installation in confined spaces with standard tools
- Fine UNF thread profile delivers enhanced grip and superior holding power compared to coarse threads
- Cup point tip design creates positive seating and prevents component slippage during operation
- Full regulatory compliance with RoHS 3 and REACH ensures environmental responsibility and global acceptance
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers exceptional engineering value in applications requiring precise component positioning and reliable torque transmission. The combination of Class 3A thread fit and UNF fine threading provides superior resistance to vibrational loosening in machinery, automotive, and precision equipment assemblies. The hex socket headless design enables flush mounting where protruding fasteners would interfere with moving parts or require streamlined profiles. With Rockwell C45 hardness, this fastener maintains dimensional stability under repeated stress cycles, while the cup point tip bites securely into shaft materials without causing excessive surface damage. Ideal for permanent positioning of gears, pulleys, and collars on rotating shafts in industrial manufacturing environments.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with precise Class 3A thread fit tolerances for consistent performance. Features 1/4"-28 UNF fine threads with right-hand direction and 2-1/2" length. Complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The black-oxide surface treatment on alloy steel substrate provides corrosion protection while maintaining dimensional accuracy.
