S-90251A143 6-32 x 3/16" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Permanent nylon patch thread locker prevents loosening under dynamic loads, maintaining secure fastening in high-vibration environments.
• Exceptional corrosion resistance: Made from 18-8 stainless steel for reliable performance in humid, corrosive, or washdown applications without rusting.
• High-strength durability: Rockwell B80 hardness ensures excellent wear resistance and thread integrity, reducing stripping and extending service life.
• Precise thread engagement: Class 3A thread fit provides tighter tolerances for superior clamping force and reduced risk of cross-threading.
• Wide temperature compatibility: Nylon patch performs reliably from -50° to 250°F, suitable for both extreme cold and moderate heat conditions.
• Secure, flush mounting: Headless design with cup tip allows countersunk installation, preventing protrusion and offering positive seating on shafts.
• Easy installation in tight spaces: Compact 1/16" hex drive enables efficient torque application with standard tools, even where clearance is limited.

Professional Applications & Engineering Value

This 6-32 UNC hex headless set screw is engineered to address critical challenges in precision assembly and machinery. The coarse thread spacing and Class 3A thread fit ensure rapid installation with minimal risk of cross-threading, while the nylon patch thread locker provides a chemical-free, reusable locking mechanism that withstands thermal cycling and vibration—ideal for motors, gears, and pulleys. The 18-8 stainless steel construction resists oxidation and chemical exposure, making it suitable for food processing, marine, and outdoor equipment. Its headless design and cup tip deliver flush mounting and enhanced grip on rotating components, preventing slippage and maintaining alignment in high-torque applications.

Specification Summary & Compliance

This set screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise dimensional accuracy. It features UNC coarse threads (6-32 size, 0.138" diameter) and a right-hand thread direction. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.