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Alloy Steel Socket Cap Screw, Black Oxide Finish, Button Head, Pin In Head Hex Drive, Meets ASME B18.3/ASTM F835, 5/8" Length, Fully Threaded, 1/4"-20 UNC Threads, Made in US (Pack of 25)

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Product Specifications
Brand Name
Small Parts
Part Number
Head Diameter
0.138  inches
Head Height
0.044  inches
Overall Length
5/8  inches
Size Name
Thread Size
Thread Coverage
Fully Threaded
Import Designation
Made in US
Indentation Hardness
39  Rockwell C
Number of Items
Tensile Strength Max
145000  PSI
Thread Class
Thread Style
Specification for this product family (See all  products)
Drive Style
Pin In Head Hex
Exterior Finish
Black Oxide
Specification Met
ASME B18.3 , ASTM F835
Material Type
Alloy Steel
Head Style
Thread Style
Right Hand
System of Measurement

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Key Features

  • Alloy steel with black oxide finish for mild corrosion resistance and lubricity
  • Button head has a rounded, low-profile top that is suitable for light duty applications
  • Pin-in-head hex drive resists tampering by requiring a special driver to tighten or loosen the screw using the hexagonal indentation with center pin
  • Meets ASME B18.3 and ASTM F835 specifications
  • Made in USA

Package Details

Shipping Weight: 0.25 pounds
Package Size: 2.6 x 1.8 x 1 inches

Product Description

The alloy steel socket cap screw has a black oxide finish and a button head with a pin-in-head hex drive, meets American Society of Mechanical Engineers ASME B18.3 and American Society for Testing and Materials ASTM F835 specifications, and is made in USA. Alloy steel is often used in applications where strength is the primary consideration. The black oxide finish offers mild corrosion resistance and lubricity. The button head is round with a low profile and short vertical sides, and is suitable for light duty applications. The pin-in-head hex drive has a hexagonal indentation with a center pin that resists tampering by requiring a special driver to tighten or loosen the screw.

Socket cap screws are threaded fasteners that have a cap head with an internal socket drive for installing in areas with limited side clearance. These screws are available with a variety of head shapes, which determine how the screw interacts with the mating surface, and drive styles, which determine the type of tool required to install the screw.

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