S-91375A657 1 1/4"-7 x 4" 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 harsh industrial environments.
- Exceptional torque transmission via the 5/8" hex drive, preventing tool slippage and ensuring secure fastening.
- High-strength performance backed by Rockwell C45 hardness, providing reliable holding power under heavy loads.
- Precise thread engagement with Class 3A UNC coarse threads, offering consistent fit and reduced cross-threading risks.
- Secure component locking enabled by the cup tip design, minimizing loosening from vibrations in machinery.
- Space-saving headless construction for applications where flush mounting is critical.
- Compliance with major industrial standards including ASME B18.3 and ASTM F912, ensuring interoperability and safety.
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to address critical challenges in industrial applications where vibration resistance, corrosion protection, and high clamping force are paramount. The 1 1/4"-7 UNC coarse threads with Class 3A fit ensure rapid assembly and reliable performance in heavy machinery, automotive components, and permanent fixtures. The headless design and cup tip provide flush mounting and concentrated point pressure, effectively securing pulleys, gears, and collars against shafts without protruding parts. Combined with Rockwell C45 hardness, it maintains integrity under repetitive stress, reducing maintenance downtime and replacement costs in demanding environments.
Specification Summary & Compliance
This set screw adheres to Class 3A thread tolerance for precise fit and UNC coarse thread standards for ease of assembly. Manufacturing conforms to ASME B18.3 and ASTM F912 specifications, ensuring dimensional accuracy and mechanical properties. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions adherence for global supply chain integration.
