S-94323A837 1/4"-20 x 1/2" Thumb Screws

Thumb Screws

0789FA00019 Thumb Screws
0789FA00019 Thumb Screws

Image may differ from product. See technical specification for details.

Part No.
Part No. 0789FA00019
Equivalent to mcmaster :
94323A837

Basic Information

System of Measurement Inch

Head Parameters

Head Type Thumb
Thumb Screw Head Shape Round
Round-Head Thumb Screw Profile Raised
Head Diameter 35/64"
Head Height 5/32"
Head Texture Knurled

Dimensions

Length 1/2"
Collar Diameter 27/64"
Collar Height 7/32"

Thread Parameters

Thread Type UNC
Thread Size 1/4"-20
Thread Diameter 0.25"
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 2A
Threading Fully Threaded

Material & Strength

Material Nylon Plastic
Hardness Not Rated
Tensile Strength 11000 psi

Temperature & Environment

Temperature Range -40° to 185° F
RoHS Compliant
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Superior hand-tightening capability with knurled head texture for slip-resistant grip in various conditions
  • Excellent corrosion resistance due to nylon plastic construction, eliminating rust concerns in humid environments
  • Wide temperature tolerance from -40° to 185°F for reliable performance across diverse operating conditions
  • Quick assembly/disassembly with thumb-operated design reducing tool dependency and maintenance time
  • Precise thread engagement through Class 2A UNC coarse threads ensuring consistent fastening performance
  • Enhanced durability with 11,000 psi tensile strength supporting repeated use in moderate stress applications
  • Environmental compliance meeting RoHS 3 standards for restricted substance control

Professional Applications & Engineering Value

This nylon thumb screw solves critical industrial challenges where frequent access and non-conductive properties are paramount. The knurled head design provides exceptional tactile grip even with gloves or oily hands, significantly reducing installation time in equipment maintenance panels, electronic enclosures, and prototyping fixtures. Its plastic construction prevents galvanic corrosion when used with dissimilar metals and eliminates short-circuit risks in electrical applications. The fully threaded 1/4"-20 UNC coarse thread with Class 2A fit maintains reliable engagement in plastic and soft metal substrates, while the temperature resistance ensures dimensional stability across industrial and outdoor environments. These features make it ideal for quick assembly applications in manufacturing, electronics, and automotive sectors where tool-less fastening accelerates production workflows.

Specification Summary & Compliance

Manufactured to precise dimensional standards including 1/4"-20 UNC coarse threads with Class 2A thread fit for consistent engagement. Features a 35/64" knurled head diameter with raised profile for enhanced ergonomics. Complies with RoHS 3 (2015/863/EU) environmental regulations regarding restricted substances. The right-hand thread direction and fully threaded 1/2" length provide standardized fastening performance across compatible applications.

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