#4-40 Black Oxide Stainless Steel Button Head Socket Cap Screws
Screw Diameter - Thread Pitch: #4-40
#4-40 Button Head Socket Cap Screws are bolts or machine screws with a Hex or Allen drive style.
- Commonly referred to as allen bolts, button heads, or socket head screws
- Clean and unstamped domed head with a flat bottom that protrudes above the installation surface
- Cylindrical head and hexagonal drive style
- Head diameter is nominally 1.5 times or more that of the screw shank (major) diameter
- Chemically treated to add a mild extra layer of corrosion and abrasion resistance
- Sleek black finished look
Black Oxide Stainless Steel Fasteners are commonly used in industries where the durability of Stainless Steel is required, but a smooth black look is desired. These industries include firearms, automotive (car and motorcycle), camping gear, archery, knife builds and product manufacturing.
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Product Specifications
ANSI
B1.1
Class
2A
Color
Black
Corrosion Resistant
Yes
Drive Style
Internal Hex (Allen)
Finish
Black Oxide
Grade
18-8
Head Diameter
Max 0.213 - Min 0.211
Head Height
Max 0.059 - Min 0.051
Head Style
Button
Hex Drive
1/16"
Material
Stainless Steel
Product Type
Button Head Socket Cap Screws
System of Measurement (Unit)
Inch
Thread Diameter
(#4) Max 0.1112 - Min 0.1061
Thread Direction
Right Hand
Thread Pitch (Count)
40 Per Inch
Thread Standard
UNC
Thread Type
Coarse
Tolerance (IFI)
Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
