S-92505A538 1/4"-20 x 5/8" ASME B18.3, ASTM F912 Set Screws

Set Screws

0657FA00027 Set Screws
0657FA00027 Set Screws

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

Part No.
Part No. 0657FA00027
Equivalent to mcmaster :
92505A538

Basic Information

System of Measurement Inch

Head Parameters

Head Type Headless

Dimensions

Length 5/8"

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 Extended
Tip Length 0.067"
Tip Length Tolerance -0.005" to 0"
Tip Diameter 0.156"
Tip Diameter Tolerance -0.007" to 0"
Drive Style Hex
Drive Size 1/8"

Material & Strength

Material Black-Oxide Alloy Steel
Hardness Rockwell C45

Temperature & Environment

REACH Compliant
RoHS Compliant
Specifications Met ASME B18.3, ASTM F912
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Exceptional holding power with Class 3A thread fit ensuring precise, secure fastening in demanding applications.
  • Superior corrosion resistance provided by the black oxide finish on alloy steel, extending service life in harsh environments.
  • High-strength durability with Rockwell C45 hardness, resisting wear and deformation under heavy loads.
  • Easy installation and removal using the 1/8" hex socket drive, allowing for efficient assembly and maintenance.
  • Reliable component positioning due to the extended tip design, which improves grip and prevents loosening.
  • Broad compatibility with UNC coarse threads and right-hand direction, fitting standard industrial equipment.
  • Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 1/4-20 UNC set screw is engineered to address common industrial challenges such as component slippage and fastener failure. Crafted from black oxide alloy steel, it offers enhanced corrosion resistance and strength, making it ideal for machinery, automotive, and assembly lines where vibration and high stress are concerns. The extended tip and coarse thread spacing provide superior grip on shafts and collars, reducing the need for frequent retightening. With a hex socket drive and headless design, it allows for flush mounting in confined spaces, streamlining installation while maintaining a low profile. This combination of features ensures reliable performance in industrial set screw applications, minimizing downtime and improving overall system integrity.

Specification Summary & Compliance

This set screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC coarse threading. It meets ASME B18.3 specifications for quality and performance, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial uses.

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