S-92311A539 1/4"-20 x 5/8" ASME B18.3 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 vibration resistance with cup point design that bites into shafts for permanent, reliable fastening
- Exceptional corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
- Precise Class 3A thread fit ensures tight tolerances and secure mating with internal threads
- High-strength performance with Rockwell B80 hardness for durable, long-lasting fastening applications
- Easy installation and removal using standard 1/8" hex tools with headless design for space-constrained applications
- Reliable coarse threading (UNC) provides faster installation and better performance in softer materials
- Full regulatory compliance meeting ASME B18.3 standards with RoHS 3 and REACH environmental regulations
Professional Applications & Engineering Value
This 1/4-20 UNC set screw delivers exceptional engineering value in demanding industrial applications where vibration resistance and permanent positioning are critical. The 18-8 stainless steel construction provides excellent corrosion resistance for machinery exposed to moisture, chemicals, or outdoor elements. The cup point design creates a deep indentation in the mating surface, preventing slippage and maintaining precise alignment in pulleys, gears, and collars. With Class 3A thread fit and coarse thread spacing, this hex headless set screw offers superior holding power in soft metals and plastics while accommodating minor misalignments. The 5/8" length provides optimal engagement depth for secure fastening in various industrial components and assemblies.
Specification Summary & Compliance
This set screw features precise Class 3A thread fit with 1/4"-20 UNC coarse threads and right-hand thread direction. Manufactured to ASME B18.3 specifications with Rockwell B80 hardness rating. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial applications. The 1/8" hex drive provides secure tool engagement during installation and removal operations.
