S-90251A540 1/4"-20 x 3/4" 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 permanent nylon patch thread locker that maintains secure fastening from -50° to 250°F
- Superior corrosion resistance provided by 18-8 stainless steel construction for extended service life in harsh environments
- Precise thread engagement with Class 3A thread fit ensuring reliable, tight-tolerance connections
- High-strength performance backed by Rockwell B80 hardness for demanding industrial applications
- Easy installation and removal through hex drive design while maintaining headless profile for space-constrained assemblies
- Optimized grip and seating with cup tip design that concentrates pressure for superior holding power
- Industry-standard compatibility with UNC coarse threads meeting ASME B18.3 specifications
Professional Applications & Engineering Value
This hex headless set screw with nylon patch thread locker solves critical vibration-induced loosening problems in industrial machinery, automotive components, and precision equipment. The 18-8 stainless steel construction provides exceptional corrosion resistance while maintaining Rockwell B80 hardness for durability under stress. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of strip-out in UNC coarse thread applications. The permanent nylon patch locking technology performs consistently across a wide temperature range (-50° to 250°F), making it ideal for environments experiencing thermal cycling. The headless design with hex drive allows for flush mounting in space-constrained assemblies while the cup tip provides concentrated contact pressure for maximum holding power against rotational forces.
Specification Summary & Compliance
This 1/4"-20 x 3/4" set screw features Class 3A thread fit precision with UNC coarse threads and right-hand thread direction. Manufactured to ASME B18.3 standards with complete compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The product meets all specified dimensional and performance requirements for industrial-grade set screws with certified material composition and manufacturing consistency.
