S-91375A120 5-40 x 3/32" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coating on alloy steel, extending service life in demanding environments
• Exceptional thread engagement with Class 3A fit ensuring precise, vibration-resistant fastening in critical assemblies
• High torque capability from the 1/16" hex drive design, allowing secure installation without stripping
• Reliable positioning with cup tip design that bites into surfaces for permanent component alignment
• Enhanced durability with Rockwell C45 hardness, maintaining structural integrity under repeated stress
• Wide industrial compatibility through UNC coarse threading, facilitating quick assembly and disassembly
• Space-saving headless construction ideal for confined applications where protruding fasteners are impractical

Professional Applications & Engineering Value

This 5-40 UNC set screw delivers critical clamping force in precision machinery, automotive systems, and electronic enclosures where vibration resistance and permanent positioning are paramount. The Black-Oxide Alloy Steel construction combats oxidation in humid or chemically aggressive environments, while the cup tip creates positive mechanical locking by embedding into shaft surfaces. With coarse thread spacing and Class 3A thread fit, it maintains clamping force under dynamic loads, solving common loosening issues in rotating assemblies. The compact 3/32" length and headless design make it indispensable for space-constrained applications requiring flush mounting.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features UNC coarse threads with right-hand direction and meets ASTM F912 material standards for consistent performance in industrial applications.