S-94567A150 4-40 x 3/8" 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
- Enhanced manual grip with knurled round head design for secure, tool-free operation in tight spaces
- Superior corrosion resistance from 6061 aluminum construction, ideal for demanding industrial environments
- Reliable thread engagement with Class 2A UNC coarse threads ensuring consistent fastening performance
- Optimized mechanical strength featuring 40,000 psi tensile strength and Rockwell B60 hardness for durable applications
- Quick installation through fully threaded 3/8" length and right-hand threading for efficient assembly
- Stable seating provided by flared collar design that prevents over-tightening and improves load distribution
- Environmental compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
Professional Applications & Engineering Value
This 4-40 UNC thumb screw delivers exceptional value in applications requiring frequent adjustments or tool-free maintenance. The 6061 aluminum construction provides excellent strength-to-weight ratio while resisting corrosion in industrial settings. Engineers benefit from the knurled head texture that ensures positive grip even with gloved hands, eliminating slippage during manual tightening. The flared collar profile distributes clamping force evenly, protecting sensitive surfaces from damage. These fully threaded fasteners are particularly valuable in electronics enclosures, instrumentation panels, and machinery access panels where repeated access is necessary. The coarse thread spacing enables rapid installation while maintaining secure holding power in various materials.
Specification Summary & Compliance
This thumb screw maintains Class 2A thread fit per UNC standards with precise 4-40 thread size and 3/8" length dimensions. Manufacturing follows RoHS 3 (2015/863/EU) compliance with exemption 6(b)-II for lead as an alloying element in aluminum, along with full REACH (EC 1907/2006) compliance. The fastener meets standard industrial specifications for right-hand threaded components with coarse thread spacing, ensuring compatibility with common mating hardware.
