S-91746A529 4-40 x 1" 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
- Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
- Excellent manual grip and torque application thanks to the fully knurled round head design
- High mechanical strength and durability with 80,000 psi tensile strength and Rockwell B85 hardness
- Reliable and precise thread engagement with UNC coarse threads and Class 2A fit for consistent fastening
- Quick and tool-free installation/removal with the convenient thumb screw head for frequent access panels
- Broad industrial compatibility with fully threaded 1" length and right-hand threading for standard applications
- Environmental regulation compliance meeting RoHS 3 and REACH standards for safe usage
Professional Applications & Engineering Value
This 4-40 UNC thumb screw delivers exceptional value in applications requiring frequent manual access or adjustments. The 18-8 stainless steel provides excellent corrosion resistance, making it ideal for electronics enclosures, laboratory equipment, and marine components where moisture exposure is common. The fully knurled head ensures secure grip even with gloves or oily hands, eliminating slippage during tightening. With its coarse UNC threading and Class 2A fit, it offers rapid installation while maintaining precise thread alignment in metal, plastic, and composite materials. The combination of 80,000 psi tensile strength and fully threaded design provides superior holding power across the entire fastener length, preventing loosening from vibration in industrial machinery, telecommunications equipment, and automotive assemblies.
Specification Summary & Compliance
This thumb screw features precision 4-40 UNC coarse threads with Class 2A thread fit for consistent dimensional accuracy and reliable performance. Manufactured from 18-8 stainless steel with Rockwell B85 hardness, it maintains dimensional stability under load. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance adherence for global industrial applications.
