S-99937A109 1/2"-13 Thumb Nuts

Key Features & Benefits at a Glance

• Tool-Free Installation: Knurled round head design enables secure hand-tightening, reducing assembly time and eliminating tool dependency.
• Superior Corrosion Resistance: Made from 316 stainless steel for excellent performance in harsh environments, including marine and chemical applications.
• Enhanced Stability & Load Distribution: Integrated flange with 13/16" collar diameter provides wider bearing surface, reducing surface pressure and preventing loosening.
• Precision Thread Engagement: Class 2B UNC coarse threads ensure reliable, vibration-resistant connections with standard 1/2"-13 male fasteners.
• Optimized Ergonomics: 1" diameter head with aggressive knurling offers maximum grip even with gloves or oily hands.
• Full Thread Coverage: Fully threaded 1/2" height allows for flexible positioning and consistent clamping force along the entire engagement length.
• Regulatory Compliance: Meets REACH and RoHS 3 standards, ensuring environmental safety and global market acceptability.

Professional Applications & Engineering Value

This 316 stainless steel flanged thumb nut solves critical industrial challenges where corrosion resistance, rapid maintenance, and vibration management are paramount. The knurled round head provides exceptional tactile grip for frequent adjustments in confined spaces or high-vibration environments like machinery guards, conveyor systems, and marine hardware. The UNC coarse threading enables faster installation than fine-thread alternatives while maintaining Class 2B fit precision with standard bolts. The integrated flange acts as a built-in washer, distributing clamp load effectively on soft materials or painted surfaces. Ideal for industrial maintenance, electrical enclosures, and transportation equipment requiring tool-free access without compromising durability.

Specification Summary & Compliance

Manufactured to precise dimensional standards with 1/2"-13 UNC Class 2B threads ensuring consistent fit with standard coarse-threaded bolts. The nut features a 13/16" collar diameter, 1/4" collar height, and 1/2" overall height with full threading. Compliant with REACH (EC 1907/2006) substance restrictions and RoHS 3 (2015/863/EU) directives, guaranteeing environmental safety and regulatory acceptance for industrial distribution.