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

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

Mutual ScrewSKU: 0406CSFBB
Price:
$7.99per 100( $0.08 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
Thread style Fully Threaded
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 Alloy Thermal Black Oxide 4-40 x 3/8 delivers a dependable fastening solution for precision assemblies. Combining high-strength alloy steel with a durable thermal black oxide finish, these flat socket cap screws are designed for reliable performance in tight spaces and clean, professional-looking installations.

  • Material: Alloy steel for excellent strength and lasting durability.
  • Finish: Thermal black oxide provides corrosion resistance and a low-glare, non-reflective appearance.
  • Size & Threads: 4-40 UNC thread, 3/8 inch long—ideal for small, precise fastenings.
  • Head & Drive: Flat socket head with hex (Allen) drive for a flush mount and easy torque control.
  • Applications: Perfect for electronics enclosures, machinery, automotive components, and other assemblies that require secure, accurate fasteners in confined spaces.

Engineered for consistent fit and reliable performance, these cap screws offer a balance of strength and versatility. The flat socket design minimizes protrusion, while the alloy and black oxide finish deliver rugged longevity and a clean look across a range of projects.

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