S-91381A338 10-32 x 1/4" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Precision brass tip prevents surface damage and marring on delicate components while ensuring secure fastening
• Black-oxide alloy steel construction provides superior corrosion resistance and extended service life in demanding environments
• Class 3A thread fit delivers exceptional dimensional accuracy and tighter tolerances for vibration-resistant assemblies
• Rockwell C28 hardness rating maintains structural integrity under repeated adjustments and high-torque applications
• Headless hex drive design enables flush mounting in confined spaces while providing reliable torque transmission
• 10-32 UNF fine threads offer increased engagement strength and superior resistance to loosening under dynamic loads
• Comprehensive compliance with ASME B18.3, RoHS 3, and REACH ensures material safety and industry-standard performance

Professional Applications & Engineering Value

Engineered for precision industrial applications where surface protection and reliable fastening are critical, this Black-Oxide Alloy Steel set screw addresses common engineering challenges in machinery assembly, precision equipment, and automotive components. The soft brass tip eliminates galling and surface damage on shafts, collars, and precision-machined parts, while the 10-32 UNF Class 3A fine threads provide superior holding power in high-vibration environments. The headless design with 3/32" hex drive allows for seamless integration in space-constrained assemblies, making it ideal for adjustable mechanisms, coupling retention, and positioning applications where flush mounting is essential. The combination of Rockwell C28 hardness and controlled surface treatment ensures consistent performance in repetitive adjustment scenarios without compromising material integrity.

Specification Summary & Compliance

This precision fastener maintains Class 3A thread fit per UNF standards, ensuring exceptional dimensional accuracy for critical assemblies. Manufacturing specifications strictly adhere to ASME B18.3 standards for set screw dimensional requirements and performance characteristics. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming material safety and environmental responsibility. Thread specifications include 10-32 UNF fine threads with right-hand direction, while the 1/4" length and 3/32" hex drive provide standardized installation compatibility across industrial applications.