S-90291A868 3/8"-16 ASME B18.3 Set Screws

Set Screws

0644FA00078 Set Screws
0644FA00078 Set Screws

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

Part No.
Part No. 0644FA00078
Equivalent to mcmaster :
90291A868

Basic Information

System of Measurement Inch

Head Parameters

Head Type Headless

Thread Parameters

Thread Type UNC
Thread Size 3/8"-16
Thread Diameter 0.375"
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 3A

Tip & Drive Parameters

Tip Type Soft
Tip Length 0.094"
Tip Diameter 0.188"
Tip Material Nylon 6/6 Plastic
Tip Color Green
Tip Temperature Range -50° to 250° F
Drive Style Hex
Drive Size 3/16"

Material & Strength

Material 18-8 Stainless Steel
Hardness Rockwell B80

Temperature & Environment

REACH Compliant
RoHS Compliant
Specifications Met ASME B18.3

Installation & Application

Long 1/4"
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 vibration resistance with a durable green nylon 6/6 tip that prevents loosening under dynamic loads.
  • Excellent corrosion resistance from 18-8 stainless steel construction, ideal for harsh or humid environments.
  • Precise thread engagement with Class 3A fit for reliable, secure fastening in high-torque applications.
  • Easy installation and removal using a standard 3/16" hex drive, reducing assembly time and tool wear.
  • Broad temperature compatibility with a nylon tip rated from -50° to 250°F for stable performance in varied conditions.
  • Enhanced durability with Rockwell B80 hardness, ensuring long-term mechanical strength and wear resistance.
  • Safe and compliant design meeting ASME B18.3, RoHS 3, and REACH standards for quality and environmental safety.

Professional Applications & Engineering Value

This 3/8"-16 UNC hex drive set screw with a green nylon 6/6 tip is engineered to address common industrial challenges such as component slippage and vibration-induced failures. Made from 18-8 stainless steel, it offers reliable corrosion resistance and strength, while the Class 3A thread fit ensures tight tolerances for secure positioning in machinery, automotive assemblies, and precision equipment. The headless design and coarse UNC threads facilitate flush mounting and quick installation, reducing maintenance downtime. Ideal for applications requiring repeated adjustments, this set screw maintains integrity across a wide temperature range, providing consistent performance in demanding environments without compromising on safety or compliance.

Specification Summary & Compliance

This set screw features a 3/8"-16 UNC coarse thread with Class 3A precision fit for accurate engagement, and is manufactured in accordance with ASME B18.3 standards. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.

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