S-91375A918 1"-12 x 1 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
- Precise Class 3A thread fit ensures secure fastening with minimal backlash for vibration-resistant assemblies
- High torque transmission capability through 9/16" hex drive design, preventing tool slippage during installation
- Enhanced gripping power from cup tip configuration, providing reliable shaft positioning in mechanical systems
- Exceptional durability with Rockwell C45 hardness, maintaining thread integrity under repeated adjustments
- Space-saving headless design allows flush mounting where clearance is limited
- Fine thread spacing delivers improved adjustment precision compared to coarse thread alternatives
Professional Applications & Engineering Value
This black-oxide alloy steel set screw addresses critical challenges in precision machinery and power transmission systems where component positioning accuracy is paramount. The 1"-12 UNF fine threads with Class 3A fit provide exceptional clamping force distribution, effectively resisting loosening under vibrational stresses common in motor couplings, gear assemblies, and rotating shaft applications. The cup tip design creates concentrated contact pressure that minimizes shaft marring while ensuring positive location security. Engineered for industrial set screw applications requiring repeated adjustments, the combination of Rockwell C45 hardness and black-oxide surface treatment delivers reliable performance in environments where corrosion resistance and dimensional stability are essential for operational safety and reduced maintenance intervals.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread tolerance for precision fit. Features 1"-12 UNF fine threads with right-hand direction and 1 1/2" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring restricted substance control.
