S-90251A535 1/4"-20 x 3/8" 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 that maintains secure fastening in dynamic environments from -50° to 250°F
- Superior corrosion resistance through 18-8 stainless steel construction for extended service life in harsh industrial conditions
- Precise thread engagement with Class 3A thread fit ensuring reliable, consistent performance in critical assemblies
- Enhanced driving torque capability with hex drive design providing superior installation control and torque transmission
- Optimized gripping performance through UNC coarse threading that resists loosening under heavy loads
- Durable mechanical properties with Rockwell B80 hardness offering excellent strength and wear resistance
- Space-saving headless design allowing flush mounting in applications with limited clearance
Professional Applications & Engineering Value
This hex headless set screw delivers exceptional engineering value in demanding industrial applications where vibration resistance and precise component positioning are critical. The 18-8 stainless steel construction provides outstanding corrosion resistance for harsh environments, while the nylon patch thread locker creates a permanent chemical bond that prevents back-out without compromising reusability. The UNC coarse threading and Class 3A thread fit ensure maximum holding power in pulleys, gears, and collars, making it ideal for machinery, automotive, and manufacturing equipment where reliability is paramount. The cup tip design concentrates pressure for superior gripping action, solving common issues of component slippage in high-torque applications.
Specification Summary & Compliance
This set screw features precision 1/4"-20 UNC coarse threading with Class 3A thread fit for superior dimensional accuracy. Manufactured in compliance with ASME B18.3 standards for dimensional consistency and performance. The product meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations for chemical safety. The Rockwell B80 hardness ensures mechanical durability, while the temperature-resistant nylon patch maintains locking effectiveness across industrial operating conditions.
