S-99607A103 4-40 x 5/16" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Tool-free operation with knurled head design for secure grip and easy hand-tightening in confined spaces
- Exceptional corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
- High load-bearing capability with 80,000 psi tensile strength and Rockwell B85 hardness for reliable performance
- Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fit and vibration resistance
- Enhanced stability from the flared collar design that prevents over-tightening and improves alignment
- Full threading versatility allowing installation at any point along the 5/16" length for flexible positioning
- Regulatory compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
Professional Applications & Engineering Value
This 4-40 UNC thumb screw delivers critical engineering solutions where tool-free fastening and corrosion resistance are paramount. The 18-8 stainless steel material withstands corrosive environments in electronics, machinery, and outdoor equipment, while the knurled head with flared collar provides slip-resistant torque application. Its coarse UNC threads and Class 2A fit enable quick installation and secure holding in plastics, aluminum, and sheet metal assemblies. Ideal for access panels, calibration covers, and frequently adjusted components, this fully threaded thumb screw eliminates tool dependency while maintaining 80,000 psi tensile strength for demanding industrial applications.
Specification Summary & Compliance
Manufactured to precise inch system dimensions including #4-40 UNC coarse threads with Class 2A thread fit for consistent engagement. The screw features a 19/64" knurled round head, 5/16" length, and flared collar design. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence. Construction meets industry standards for 18-8 stainless steel fasteners with specified mechanical properties including Rockwell B85 hardness and 80,000 psi tensile strength.
