S-90291A709 1/2"-13 ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Non-marring protection with a green nylon 6/6 plastic tip that prevents damage to mating surfaces while maintaining secure fastening.
• Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh or humid industrial environments.
• High-precision thread fit with Class 3A UNC coarse threads ensuring reliable engagement and vibration resistance in demanding applications.
• Wide temperature tolerance with a nylon tip that performs consistently from -50° to 250°F without losing grip integrity.
• Secure hex drive installation using a 1/4" hex key, providing ample torque transfer and reducing the risk of tool slippage.
• Headless, space-saving design that allows for flush mounting in assemblies where protruding fasteners are not feasible.
• Regulatory compliance assurance meeting ASME B18.3 standards and RoHS 3/REACH directives for safe, industry-approved use.

Professional Applications & Engineering Value

This 1/2"-13 UNC Class 3A set screw is engineered to address common industrial challenges such as component slippage, surface marring, and corrosion-induced failure. The 18-8 stainless steel body offers excellent durability and resistance to rust, while the green nylon 6/6 plastic tip provides a non-abrasive contact point that preserves finished surfaces on shafts, collars, and gears. Its coarse thread design and Class 3A fit enhance holding power in high-vibration settings like machinery, automotive, and conveyor systems. The hex drive and headless profile facilitate easy installation in tight spaces, making it a versatile choice for OEMs and maintenance teams requiring reliable, long-term fastening without frequent re-tightening.

Specification Summary & Compliance

This set screw features a 1/2"-13 UNC coarse thread with a Class 3A precision fit for optimal thread engagement. It is manufactured from 18-8 stainless steel with a Rockwell B80 hardness and includes a nylon tip measuring 0.125" in length and 0.25" in diameter. The product conforms to ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.