S-91882A415 1/4"-20 x 3/8" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual grip with knurled head texture for secure tightening without tools in confined spaces
• Superior corrosion resistance from black-oxide steel finish, extending service life in industrial environments
• High-load capacity with 70,000 psi tensile strength and Rockwell B84 hardness for demanding applications
• Quick installation through UNC coarse threading and Class 2A fit ensuring smooth engagement with standard nuts
• Ergonomic raised profile design improves finger contact pressure for comfortable repeated adjustments
• Full-threaded construction provides consistent clamping force along the entire 3/8" length
• Regulatory compliance meets RoHS 3 and REACH standards for international industrial use

Professional Applications & Engineering Value

Engineered for industrial equipment maintenance and access panel security, these black-oxide steel thumb screws solve critical accessibility challenges. The knurled head delivers positive grip even with oily gloves, while the UNC coarse thread resists cross-threading during blind installations. The raised round-head profile distributes hand pressure evenly, reducing operator fatigue during frequent adjustments on machinery guards, electronic enclosures, and production jigs. With 70,000 psi tensile strength, they maintain clamping force under vibration in automotive assembly and material handling systems where tool-free access is prioritized.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances with 1/4"-20 UNC coarse threads and right-hand direction. Features include 1" head diameter, 1/4" head height, 1/2" collar diameter, and 3/8" collar height. Fully compliant with RoHS 3 (2015/863/EU) under exemption 6(a)-I and REACH (EC 1907/2006) regulations for industrial fastener applications.