Mutual Screw & Supply

HOLO-KROME 72122 5/16-18 X 5/8" Socket Cap Screws | Hex Socket Drive | Alloy Steel Thermal Black Oxide (100 / Pkg.)

HOLO-KROME 72122 5/16-18 X 5/8" Socket Cap Screws | Hex Socket Drive | Alloy - Main image
$24.94 $36.14 In stock

These 5/16-18 x 5/8" socket cap screws are manufactured from Alloy Steel Thermal Black Oxide, featuring a socket drive. They are well suited to machinery, tooling, jigs, and precision assemblies.

  • Material and finish: Alloy Steel Thermal Black Oxide
  • Drive: Socket Drive
  • Thread size: 5/16-18
  • Length: 5/8"
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Material: Alloy Steel
  • Finish: Thermal Black Oxide
  • Drive type: Socket Drive
  • Thread size: 5/16-18
  • Length: 5/8"
  • Threads per inch: 18
  • Measurement type: Inch
  • Pack quantity: 100 per package
Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy
If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy
Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (5.0 / 5 · 5 reviews)

Hannah U. ★★★★★

I needed some fasteners for a jig I’m building, and these socket cap screws fit perfectly with no wobble. The hex drive seated nicely with my Allen wrench, and the black oxide finish has held up well so far.

Ella P. ★★★★★

The black oxide finish gives these a nice, durable look, and the hex drive made them easy to tighten with a standard Allen key. Worked perfectly for securing a new jig plate I was setting up.

Jason ★★★★★

These are my go-to for jigs and fixtures now. The black oxide finish feels properly done, and they drive in smoothly with a hex key without any stripping. The 5/16-18 thread size was spot on for what I needed.