S-91375A149 3-56 x 1/8" 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 environments
- Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash in critical assemblies
- High-strength Rockwell C45 hardness provides excellent resistance to wear and deformation under load
- Compact headless hex drive design allows for flush installation in space-constrained applications
- Fine UNF thread spacing delivers enhanced clamping force and vibration resistance
- Cup point tip creates strong biting action into shafts and components for reliable positioning
- Full compliance with ASME B18.3 guarantees dimensional accuracy and interchangeability
Professional Applications & Engineering Value
This 3-56 UNF set screw with black-oxide alloy steel construction addresses critical challenges in precision machinery and electronic enclosures where space optimization and corrosion prevention are paramount. The headless hex drive and compact 1/8" length enable seamless integration into tight assemblies without protruding hardware, while the Class 3A thread fit and fine thread spacing ensure zero loosening under high-vibration conditions. The cup tip design provides superior grip on rotating shafts and gears, preventing axial movement in power transmission systems. Ideal for servo motors, optical devices, and precision instruments, this fastener combines Rockwell C45 hardness with chemical-resistant coating to maintain clamping force in humid or mildly corrosive industrial environments.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit tolerance for precision assemblies. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features unified UNF fine threads (3-56) with right-hand direction and 0.050" hex drive size. Material certification includes alloy steel with black-oxide surface treatment per ASTM F912 standards.
