S-94115A537 1/4"-20 x 1/2" ASME B18.3 Set Screws

Set Screws

0646FA00033 Set Screws
0646FA00033 Set Screws

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

Part No.
Part No. 0646FA00033
Equivalent to mcmaster :
94115A537

Basic Information

System of Measurement Inch

Head Parameters

Head Type Headless

Dimensions

Length 1/2"

Thread Parameters

Thread Type UNC
Thread Size 1/4"-20
Thread Diameter 0.25"
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 3A

Tip & Drive Parameters

Tip Type Soft
Tip Length 0.063"
Tip Diameter 1/8"
Tip Material Nylon 6/6 Plastic
Tip Color Green
Tip Temperature Range -50° to 250° F
Drive Style Hex
Drive Size 1/8"

Material & Strength

Material Black-Oxide Alloy Steel
Hardness Rockwell C28

Temperature & Environment

REACH Compliant
RoHS Compliant
Specifications Met ASME B18.3
Technical Drawings No drawings available at the moment, will be launched soon
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Key Features & Benefits at a Glance

  • Superior vibration resistance with nylon 6/6 tip that prevents loosening under dynamic loads
  • Exceptional durability from alloy steel construction with Rockwell C28 hardness for long service life
  • Enhanced corrosion protection through black-oxide surface treatment in demanding environments
  • Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening
  • Easy installation and removal using standard 1/8" hex drive tools
  • Wide temperature compatibility with nylon tip performing from -50° to 250°F
  • Space-saving design as headless set screw for compact assemblies

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance in industrial applications where vibration resistance and precise positioning are paramount. The nylon 6/6 tip creates consistent friction locking that prevents back-out in machinery, automotive components, and power transmission systems. Engineered with Class 3A UNC coarse threads, it provides superior holding power while accommodating minor misalignments. The headless design enables flush mounting in confined spaces, while the hex drive ensures secure tool engagement during installation. This combination addresses common challenges of component slippage, thread damage, and maintenance accessibility in demanding assembly environments.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance. Features UNC 1/4"-20 coarse threads with right-hand direction. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The nylon tip maintains integrity across the specified temperature range of -50° to 250°F.

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