S-91381A555 1/4"-20 x 1 1/2" ASME B18.3 Set Screws

Key Features & Benefits at a Glance

• Superior holding power with Class 3A UNC coarse threads ensuring tight, reliable fastening in demanding applications
• Non-marring brass tip protects sensitive surfaces from damage while providing secure contact
• Exceptional durability from black-oxide alloy steel construction with Rockwell C28 hardness for long service life
• Easy installation and removal with hex drive design requiring minimal clearance space
• Corrosion-resistant black-oxide finish enhances performance in various industrial environments
• Precision manufacturing to ASME B18.3 standards guarantees consistent quality and dimensional accuracy
• Environmental compliance with RoHS 3 and REACH regulations for safe, sustainable usage

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value for industrial applications requiring secure component positioning. The Class 3A UNC coarse thread provides superior resistance to vibration loosening in machinery, power transmission systems, and precision equipment. The headless hex drive design allows installation in confined spaces where traditional fasteners cannot fit. The integrated brass soft tip prevents damage to shafts, gears, and collars while maintaining maximum clamping force. Engineered for heavy-duty applications, this set screw solves critical challenges in manufacturing, automotive, and industrial maintenance where vibration resistance and surface protection are paramount concerns.

Specification Summary & Compliance

This precision set screw features 1/4"-20 UNC coarse threads with Class 3A fit for superior dimensional accuracy and thread engagement. Manufactured to ASME B18.3 specifications ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict regulatory adherence.