S-90291A624 3/8"-16 ASME B18.3 Set Screws

Set Screws

0644FA00042 Set Screws
0644FA00042 Set Screws

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

Part No.
Part No. 0644FA00042
Equivalent to mcmaster :
90291A624

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"
Technical Drawings No drawings available at the moment, will be launched soon
In Stock
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Key Features & Benefits at a Glance

  • Vibration-resistant locking with durable Nylon 6/6 plastic tip that prevents loosening under dynamic loads
  • Superior corrosion resistance from 18-8 stainless steel construction for long-term reliability in harsh environments
  • Precise thread engagement with Class 3A thread fit ensuring secure fastening in demanding applications
  • Wide temperature tolerance with nylon tip rated for -50° to 250° F (-45° to 121° C) operation
  • Enhanced installation control through 3/16" hex drive design allowing high torque application
  • Reduced component damage with soft nylon tip that protects sensitive surfaces during clamping
  • Industry compliance assurance meeting ASME B18.3 specifications for consistent quality and performance

Professional Applications & Engineering Value

This hex headless set screw delivers exceptional engineering value in precision assembly applications where space constraints and vibration resistance are critical. The 18-8 stainless steel construction provides excellent corrosion resistance for industrial environments, while the Class 3A thread fit ensures precise engagement in UNC coarse thread applications. The nylon tip offers superior vibration damping compared to metal-to-metal contact, preventing unintended loosening in machinery, automotive components, and electrical enclosures. With its temperature-resistant nylon tip maintaining integrity across extreme conditions (-50° to 250° F), this set screw solves common challenges in manufacturing equipment, motion control systems, and precision instrumentation where reliable positioning and minimal maintenance are essential.

Specification Summary & Compliance

This precision fastener features 3/8"-16 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy and engagement. Manufactured to ASME B18.3 specifications, the set screw maintains strict quality standards throughout production. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations. With a Rockwell B80 hardness rating and precise thread geometry, this fastener delivers consistent performance in industrial applications requiring reliable clamping force and positional accuracy.

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