#4-40 X 3/8" Flat Head Cap Screws | Nylon Patch | Alloy Steel Thermal Black Oxide (100 / Pkg.)

Mutual ScrewSKU: 0406CSFPBB

Price:
Sale price$25.41per 100( $0.25 each)
Pieces 100
Measurement type Inch
Thread size #4-40
Length 3/8
Material Alloy Steel
Finish Thermal Black Oxide
Drive Hex Socket
Head style Flat
Threads per inch 40
Weight 1.0 lb

WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to https://www.P65Warnings.ca.gov.

Description

Cap Screws Flat Socket Nylon Patch Alloy Thermal Black Oxide 4-40 x 3/8 are precision-engineered flat socket cap screws designed for secure, high-precision fastening in a variety of assemblies. Featuring a nylon patch backing, alloy construction, and a thermal black oxide finish, these screws offer reliable performance in demanding environments.

Key benefits include enhanced load distribution, reduced vibration, and protection of mating surfaces thanks to the nylon patch. The 4-40 thread size and 3/8 inch length make these screws ideal for electronics, automotive, and industrial applications where a compact, corrosion-resistant fastener is required.

Features

  • Thread size: 4-40
  • Length: 3/8 in
  • Head style: Flat Socket Cap
  • Material: Alloy with Nylon Patch backing
  • Finish: Thermal Black Oxide
  • Applications: Electronics, machinery, enclosures, and more

Why choose these cap screws?

They combine strength, durability, and a non-marring backing for sensitive surfaces. The thermal black oxide finish provides corrosion resistance and a low-reflectivity appearance, making them suitable for both functional and aesthetic demands in professional assemblies.

Specifications

  • Thread type: 4-40
  • Length: 3/8 in
  • Head: Flat Socket Cap
  • Material: Alloy
  • Finish: Thermal Black Oxide
  • Backing: Nylon Patch

Can We Help?

If you’re not sure that this product is right for you, give us a call!
800-222-0324

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