S-91882A371 10-32 x 5/16" Thumb Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel finish for extended service life in demanding environments
• Excellent hand-adjustability thanks to the knurled round head design requiring no tools for fast operation
• Precise thread engagement with Class 2A fit and UNF fine threads ensuring secure, vibration-resistant connections
• High mechanical strength with 70,000 psi tensile strength and Rockwell B84 hardness for reliable performance under load
• Full threading coverage along the 5/16" length provides maximum adjustability and holding power
• Raised head profile with collar creates a stable bearing surface and prevents over-tightening
• Regulatory compliance with RoHS 3 and REACH standards for use in regulated industries

Professional Applications & Engineering Value

This black-oxide steel thumb screw delivers exceptional value in applications requiring frequent adjustments without tools. The knurled head texture provides positive grip even with oily hands or gloves, while the 10-32 UNF fine threads offer superior resistance to vibration loosening compared to coarse threads. The fully threaded design ensures maximum engagement in tapped holes, making it ideal for precision equipment, electronic enclosures, and industrial machinery where reliable hand-operated fastening is critical. The raised round head profile with integrated collar distributes clamping pressure evenly, protecting sensitive surfaces from damage during repeated adjustments.

Specification Summary & Compliance

This thumb screw features Class 2A thread fit tolerance per UNF standards with right-hand fine threading (32 TPI). Manufacturing complies with RoHS 3 (2015/863/EU) with exemption 6(a)-I for lead as an alloying element in steel, and REACH (EC 1907/2006) compliance as of January 17, 2023. Dimensions include: 1/2" head diameter, 7/32" head height, 3/8" collar diameter, and 5/16" length with fully threaded construction.