S-90251A534 1/4"-20 x 5/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon patch thread locker that maintains secure fastening from -50° to 250°F
• Superior corrosion resistance thanks to 18-8 stainless steel construction for long service life in harsh environments
• Precise thread engagement with Class 3A thread fit ensuring reliable, tight connections in critical applications
• Enhanced durability with Rockwell B80 hardness providing excellent wear resistance and mechanical strength
• Easy installation and removal with hex drive design allowing for straightforward tool access in confined spaces
• Industry-standard compatibility with UNC coarse threads and 1/4"-20 size for broad application across equipment
• Secure positioning capability with cup tip design that digs into surfaces to prevent component slippage

Professional Applications & Engineering Value

This 1/4"-20 UNC set screw delivers exceptional performance in demanding industrial settings where vibration resistance and precise component positioning are critical. The 18-8 stainless steel construction provides excellent corrosion resistance for applications exposed to moisture, chemicals, or outdoor elements, while the nylon patch thread locker effectively prevents loosening under dynamic loads and thermal cycling from -50° to 250°F. The Class 3A thread fit ensures tight tolerances for reliable fastening in precision machinery, automotive assemblies, and manufacturing equipment. The hex headless design with cup tip offers flush mounting capabilities while maintaining positive grip on shafts, collars, and pulleys, solving common challenges of component slippage and maintenance-intensive fastening systems.

Specification Summary & Compliance

This set screw features 1/4"-20 UNC coarse threads with Class 3A thread fit for precision engagement, manufactured to ASME B18.3 specifications. The fastener maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for various industrial applications while meeting international standards for hazardous substance restrictions.