S-94320A748 1/4"-20 x 1 3/4" Thumb Screws

Thumb Screws

0791FA00021 Thumb Screws
0791FA00021 Thumb Screws

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

Part No.
Part No. 0791FA00021
Equivalent to mcmaster :
94320A748

Basic Information

System of Measurement Inch

Head Parameters

Head Type Thumb
Thumb Screw Head Shape Round
Round-Head Thumb Screw Profile High
Head Diameter 31/64"
Head Height 5/16"
Head Texture Knurled

Dimensions

Length 1 3/4"

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

Tip & Drive Parameters

Drive Style Slotted

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 manual operation with a high-profile round head and deep knurling for excellent grip without tools
  • Durable Nylon Plastic construction provides corrosion resistance and electrical insulation for long-lasting performance
  • Wide temperature tolerance from -40° to 185°F ensures reliable performance in varying environmental conditions
  • 11,000 psi tensile strength delivers secure fastening for light to medium-duty applications
  • Fully threaded UNC coarse design enables quick installation and strong holding power
  • Class 2A thread fit guarantees consistent, precise engagement with mating components
  • RoHS 3 compliance meets environmental regulations for safe use in regulated industries

Professional Applications & Engineering Value

This high-profile round thumb screw solves critical manual fastening challenges in industrial settings where tool-free adjustment is essential. The Nylon Plastic construction eliminates galvanic corrosion concerns when used with dissimilar metals while providing excellent electrical insulation properties. The deeply knurled head texture ensures positive grip even with gloved hands or in oily conditions, reducing installation time and improving operator safety. The UNC coarse threading and Class 2A thread fit provide reliable engagement in plastic and metal components, making these thumb screws ideal for frequent access panels, electronic enclosures, and adjustment mechanisms. The material's inherent vibration resistance helps maintain clamp load in dynamic applications, while the temperature resistance from -40° to 185°F ensures performance stability across diverse operating environments.

Specification Summary & Compliance

This thumb screw features precise 1/4"-20 UNC coarse threading with Class 2A thread fit for consistent engagement and reliable performance. The fully threaded design extends the complete 1 3/4" length for maximum fastening versatility. Manufactured to exacting standards, this component is RoHS 3 (2015/863/EU) compliant, meeting current environmental regulations for restricted substances. The right-hand thread direction follows industry-standard fastening conventions for straightforward installation and removal.

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