S-91375A889 5/16"-18 x 5/8" 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 zinc plating, extending service life in harsh industrial environments
- Exceptional mechanical strength from Rockwell C45 hardened alloy steel, preventing deformation under high loads
- Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash in assemblies
- High-torque capability with 5/32" hex drive, allowing reliable installation with standard tools
- Effective component locking through cup point design that bites into shafts for permanent positioning
- Broad industrial compatibility with UNC coarse threads for quick assembly and vibration resistance
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global applications
Professional Applications & Engineering Value
This zinc plated alloy steel set screw delivers critical performance where component slippage or misalignment cannot be tolerated. The Class 3A UNC coarse threads provide superior engagement in soft materials and faster installation compared to fine threads, while the cup point tip creates permanent dimples in shafts for maximum resistance to rotational forces. Engineered with Rockwell C45 hardness, it maintains dimensional stability under continuous vibration and shock loads common in machinery, power transmission systems, and automotive assemblies. The headless design with 5/32" hex drive enables flush mounting in confined spaces while accommodating high installation torque. These characteristics make it ideal for securing gears, pulleys, and collars where reliability and corrosion resistance are paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance. Features 5/16"-18 UNC coarse threads with right-hand direction and 5/8" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
