S-91833A121 8-32 Thumb Nuts

Thumb Nuts

1038FA00018 Thumb Nuts
1038FA00018 Thumb Nuts

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

Part No.
Part No. 1038FA00018
Equivalent to mcmaster :
91833A121

Basic Information

System of Measurement Inch
Nut Type Thumb

Dimension Parameters

Height 3/8"

Thread Parameters

Thread Type UNC
Thread Size 8-32
Threading Fully Threaded
Thread Direction Right Hand
Thread Spacing Coarse
Thread Fit Class 2B

Head Parameters

Thumb Nut Head Shape Round
Thumb Nut Profile Standard
Head Diameter 1/2"
Head Texture Knurled

Material & Strength Parameters

Material 18-8 Stainless Steel

Finish & Compliance Parameters

RoHS RoHS 3 (2015/863/EU) Compliant
REACH REACH (EC 1907/2006) (07/08/2021, 219 SVHC) Compliant

Geometric Parameters

Collar Diameter 5/16"
Collar Height 1/4"
Technical Drawings No drawings available at the moment, will be launched soon
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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 hand-tightening capability thanks to the knurled round head design for secure grip without tools
  • Reliable thread engagement with fully threaded 8-32 UNC coarse spacing for strong holding power
  • Precision thread fit with Class 2B tolerance ensuring consistent, vibration-resistant connections
  • Right-hand threading compatibility for standard industrial assembly applications
  • Regulatory compliance assurance meeting both REACH and RoHS 3 standards for safe industrial use
  • Durable standard profile with 5/16" collar diameter and 3/8" height for robust mechanical performance

Professional Applications & Engineering Value

This 18-8 stainless steel thumb nut delivers exceptional value in applications requiring frequent adjustments or tool-free maintenance. The knurled round head provides positive grip even with oily hands or gloves, solving accessibility challenges in tight spaces. The fully threaded 8-32 UNC coarse spacing ensures rapid installation and removal while maintaining strong clamping force. Stainless steel construction resists corrosion from chemicals, moisture, and industrial atmospheres, making it ideal for machinery, electrical enclosures, and assembly fixtures. The right-hand thread direction and standard thumb nut profile ensure compatibility with existing industrial components, reducing installation time and inventory complexity.

Specification Summary & Compliance

This thumb nut features precision UNC threading with 8-32 coarse spacing and Class 2B thread fit for consistent engagement. Manufacturing adheres to standard dimensional requirements with 5/16" collar diameter and 3/8" overall height. The product is fully compliant with REACH (EC 1907/2006) regulations and RoHS 3 (2015/863/EU) directives, ensuring environmental safety and regulatory acceptance for industrial applications worldwide.

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