S-91375A108 4-40 x 3/8" 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 harsh industrial environments
- Exceptional holding power from Class 3A thread fit, ensuring vibration-resistant fastening in precision assemblies
- High-strength durability with Rockwell C45 hardness alloy steel, maintaining integrity under heavy mechanical stress
- Secure tamper-resistant installation using hex drive design, providing reliable torque transmission without head protrusion
- Optimized grip and positioning with cup tip design, preventing component slippage in right-hand threaded applications
- Broad compatibility with UNC coarse threading, enabling quick assembly across standard industrial components
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3 and REACH standards for global quality acceptance
Professional Applications & Engineering Value
Engineered for precision industrial applications, this 4-40 UNC set screw delivers critical solutions for component positioning and shaft securing. The black-oxide alloy steel construction provides essential corrosion protection in manufacturing environments where moisture and chemicals are present. With its headless design and hex drive, it enables flush mounting in confined spaces while maintaining high torque capability. The Class 3A thread fit ensures tight tolerances for vibration-prone assemblies, preventing loosening in machinery, automotive, and aerospace components. The cup tip configuration creates concentrated contact pressure, ideal for permanent positioning of gears, pulleys, and collars on shafts and axles.
Specification Summary & Compliance
This set screw maintains precision UNC threading with 4-40 thread size and Class 3A thread fit for superior dimensional accuracy. Manufacturing conforms to ASME B18.3 specifications (ASTM F912) with 3/8" length and 0.050" hex drive. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and global market acceptance.
