S-90669A537 1/4"-20 x 1/2" 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 corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh industrial environments
- Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash in critical applications
- Protective brass soft tip prevents damage to mating surfaces while maintaining excellent grip and alignment
- Hex drive design provides high torque capability and reliable installation with standard tools
- Rockwell B80 hardness delivers optimal balance of strength and ductility for repeated use
- Full regulatory compliance with ASME B18.3, RoHS 3, and REACH standards for global industrial acceptance
- Coarse UNC threading enables quick assembly and disassembly while resisting vibration loosening
Professional Applications & Engineering Value
This 1/4-20 UNC Class 3A set screw delivers exceptional engineering value in precision assembly applications where surface protection and reliable positioning are critical. The 18-8 stainless steel construction provides excellent corrosion resistance for machinery operating in demanding environments, while the brass soft tip eliminates marring and damage to expensive components during clamping operations. The hex headless design allows for flush mounting in confined spaces, making it ideal for shaft collars, gears, pulleys, and precision instruments. With its Class 3A thread fit and coarse threading, this set screw maintains secure positioning even under vibration and thermal cycling, reducing maintenance requirements and ensuring long-term operational reliability in industrial equipment.
Specification Summary & Compliance
This precision fastener features 1/4"-20 UNC coarse threads with Class 3A fit for tight tolerances and reliable engagement. Manufactured from 18-8 stainless steel with Rockwell B80 hardness, it includes a brass soft tip measuring 0.063" in length and 1/8" in diameter. The product fully complies with ASME B18.3 dimensional standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use worldwide.
