S-98625A128 1/4"-80 x 3 1/4" Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with ultra fine 1/4"-80 thread pitch for secure fastening in high-precision applications
• Excellent corrosion resistance provided by 303 stainless steel construction for extended service life in demanding environments
• Precise thread engagement with Class 3A fit ensuring reliable performance and minimal backlash in critical assemblies
• Enhanced gripping power from the alloy steel ball tip that creates positive seating and reduces component slippage
• Easy installation and removal with hex drive design allowing efficient torque application in confined spaces
• Space-saving headless design ideal for applications where protruding fastener heads are not permissible
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for use in regulated industries

Professional Applications & Engineering Value

This 1/4"-80 ultra fine thread set screw delivers exceptional engineering value in precision mechanical systems where minute adjustments and secure positioning are critical. The 303 stainless steel construction provides excellent corrosion resistance while maintaining good machinability, making it ideal for aerospace components, medical devices, and optical equipment. The Class 3A thread fit ensures precise engagement with mating parts, eliminating play in sensitive mechanisms. The alloy steel ball tip creates concentrated contact pressure, preventing slippage in shaft collars, gears, and pulleys. The hex drive design facilitates installation in tight spaces where socket access is limited, while the headless configuration allows flush mounting in rotating assemblies. This combination of features addresses common industrial challenges of vibration-induced loosening, corrosion degradation, and space constraints.

Specification Summary & Compliance

This precision set screw features a 1/4"-80 UNS ultra fine thread with Class 3A fit for exacting dimensional accuracy. The 3 1/4" length provides extended reach for deep applications. Manufacturing complies with RoHS 3 (2015/863/EU) with exemption 6(c) for lead in copper alloy and REACH (EC 1907/2006) compliance as of 06/14/2023. The right-hand thread direction follows standard industrial conventions for consistent installation across applications.