S-90251A110 4-40 x 3/16" 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
- Vibration-resistant locking with nylon patch thread locker maintains secure fastening in dynamic environments from -50°F to 250°F
- Superior corrosion resistance from 18-8 stainless steel construction ensures long-term reliability in harsh industrial conditions
- Precision Class 3A thread fit provides exceptional dimensional accuracy for consistent, reliable assembly performance
- High-strength durability with Rockwell B80 hardness offers excellent resistance to wear and deformation under load
- Secure hex drive engagement with 0.050" drive size prevents cam-out and ensures proper torque application
- Cup tip design creates positive seating and maximum holding power on shaft surfaces
- Industry compliance assurance meets ASME B18.3 specifications for guaranteed quality and performance standards
Professional Applications & Engineering Value
This 4-40 UNC set screw delivers critical engineering solutions for precision assembly challenges where vibration resistance and corrosion protection are paramount. The 18-8 stainless steel construction combined with the nylon patch thread locker addresses common industrial pain points of fastener loosening and environmental degradation. Engineered with Class 3A thread fit and coarse thread spacing, this hex headless set screw ensures reliable performance in machinery, automotive components, and electronic enclosures where space constraints demand compact, high-strength fastening. The cup tip design provides superior biting action on shafts and collars, preventing rotational slippage in high-torque applications while maintaining surface integrity.
Specification Summary & Compliance
This precision fastener features 4-40 UNC right-hand threads with Class 3A thread fit for exceptional dimensional accuracy. Manufactured to ASME B18.3 specifications with Rockwell B80 hardness rating. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial applications. The nylon patch thread locker maintains effectiveness across the specified temperature range of -50°F to 250°F.
