S-91221A146 8-32 x 3/8" ASME B18.3, UL 94 HB Plastic Socket Head Screws

Plastic Socket Head Screws

0021FA00021 Plastic Socket Head Screws
0021FA00021 Plastic Socket Head Screws

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

Part No.
Part No. 0021FA00021
Equivalent to mcmaster :
91221A146

Basic Information

Color Black
System of Measurement Inch

Head Parameters

Head Type Socket
Head Diameter 0.27"
Head Height 0.164"
Socket Head Profile Standard

Dimensions

Length 3/8"

Thread Parameters

Thread Type UNC
Thread Size 8-32
Thread Diameter 0.164"
Thread Spacing Coarse
Thread Direction Right Hand
Thread Fit Class 2A
Threading Fully Threaded

Tip & Drive Parameters

Drive Style Hex
Drive Size 9/64"

Material & Strength

Material Glass-Filled Nylon Plastic
Hardness Not Rated
Tensile Strength 17000 psi

Temperature & Environment

Temperature Range -40° to 200° F
REACH Compliant
RoHS Compliant
Specifications Met ASME B18.3, UL 94 HB
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 strength-to-weight ratio with 17,000 psi tensile strength, ideal for reducing component weight without sacrificing load-bearing capacity.
  • Superior temperature resistance from -40° to 200°F, ensuring reliable performance in fluctuating thermal environments.
  • Corrosion-free and electrically non-conductive due to glass-filled nylon construction, perfect for electrical and corrosive settings.
  • Precise Class 2A thread fit for easy assembly and consistent engagement, minimizing cross-threading risks.
  • Durable hex drive design with a 9/64" drive size, providing secure torque application and reduced tool slippage.
  • Compliance with ASME B18.3 standards, ensuring dimensional accuracy and interchangeability in industrial assemblies.
  • Environmentally responsible with RoHS 3 and REACH compliance, meeting global regulatory requirements.

Professional Applications & Engineering Value

Engineered for demanding applications, this 8-32 UNC thread socket head cap screw in glass-filled nylon plastic addresses common industrial challenges like corrosion, electrical isolation, and weight reduction. Its coarse thread spacing and Class 2A thread fit facilitate quick installation in plastics and soft metals, reducing assembly time. The black color and socket head profile allow for discreet, low-profile fastening in consumer electronics, automotive components, and machinery enclosures. With a temperature range of -40° to 200°F, it performs reliably in outdoor or thermally variable environments, while the 17,000 psi tensile strength ensures long-term durability under static loads.

Specification Summary & Compliance

This screw features a 3/8" length, UNC coarse thread with Class 2A fit for standard tolerance, and is manufactured to ASME B18.3 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards. The right-hand thread direction and fully threaded design provide consistent fastening performance across industrial applications.

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