S-94105A322 4-40 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 precision with Class 3A fit ensures secure, vibration-resistant fastening in critical assemblies
• High-strength construction with Rockwell C45 hardness provides reliable holding power without stripping or deformation
• Optimized drive efficiency through 0.050" hex drive design enables precise torque application in confined spaces
• Enhanced positioning accuracy with flat tip design distributes clamping force evenly for component stability
• Industry-standard compatibility with 4-40 UNC coarse threads simplifies replacement and meets common machinery specifications
• Space-saving headless profile allows flush mounting where protruding fasteners are impractical

Professional Applications & Engineering Value

Engineered for precision locking applications, this 4-40 UNC set screw combines black-oxide alloy steel construction with Class 3A thread fit to address common industrial challenges like vibrational loosening and component misalignment. The flat tip design creates uniform surface contact, preventing damage to shafts and collars while maintaining concentricity in assemblies. Its coarse thread spacing enables rapid installation in soft materials or blind holes, reducing assembly time in production lines. Ideal for securing gears, pulleys, and knobs in machinery, electronics, and automotive systems, the screw’s headless configuration and hex drive facilitate use in recessed spaces where clearance is limited. The Rockwell C45 hardness ensures consistent performance under cyclic loads, making it a reliable choice for OEM and MRO applications requiring repeated adjustments.

Specification Summary & Compliance

This set screw maintains Class 3A thread fit per UNC standards with precise 4-40 threading and coarse pitch for optimal engagement. Manufacturing adheres to ASME B18.3 dimensional requirements (ASTM F912), ensuring interchangeability. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming suitability for regulated industries and international supply chains.