S-99937A107 5/16"-18 Thumb Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and outdoor applications
• Effortless manual installation thanks to the knurled round head design, eliminating the need for tools in tight spaces
• Enhanced stability and load distribution from the integrated flange, reducing the risk of loosening under vibration
• Reliable coarse UNC threading ensures quick assembly and disassembly while maintaining secure fastening
• Precision Class 2B thread fit provides consistent engagement and smooth operation with standard bolts
• Full compliance with RoHS 3 and REACH standards, guaranteeing safety and environmental responsibility
• Durable 17/32" collar diameter offers a substantial gripping surface for secure hand-tightening applications

Professional Applications & Engineering Value

This 316 stainless steel thumb nut delivers exceptional performance in demanding settings where corrosion resistance and manual operation are critical. The flanged design increases bearing surface area, preventing surface damage and maintaining joint integrity under dynamic loads. With 5/16"-18 UNC coarse threading and Class 2B fit, it ensures rapid installation in machinery, electrical enclosures, and marine equipment. The knurled round head provides superior grip even with oily hands or gloves, reducing assembly time in maintenance and manufacturing. Its full threading allows for adjustable positioning, making it ideal for prototyping and field service where tool access is limited.

Specification Summary & Compliance

This thumb nut features 5/16"-18 UNC coarse threads with Class 2B thread fit for consistent dimensional accuracy. Manufactured from 316 stainless steel with a flanged, knurled round head profile, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to industrial safety and environmental standards.