Mutual Screw & Supply

5/16-18 X 9" Socket Cap Screws | Hex Socket Drive | Partially Threaded | Alloy Steel Thermal Black Oxide (9 / Pkg.)

5/16-18 X 9" Socket Cap Screws | Hex Socket Drive | Partially Threaded | Alloy - Main image
$31.68 $47.28 In stock

These 5/16-18 x 9" socket cap screws are manufactured from Alloy Steel Thermal Black Oxide, featuring a hex socket drive. They are well suited to machinery, tooling, jigs, and precision assemblies.

  • Material and finish: Alloy Steel Thermal Black Oxide
  • Drive: Hex Socket Drive
  • Thread style: Partially Threaded
  • Thread size: 5/16-18
  • Length: 9"
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Material: Alloy Steel
  • Finish: Thermal Black Oxide
  • Drive type: Hex Socket Drive
  • Thread style: Partially Threaded
  • Thread size: 5/16-18
  • Length: 9"
  • Threads per inch: 18
  • Measurement type: Inch
  • Pack quantity: 9 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 (4.0 / 5 · 5 reviews)

Emma ★★★★★

The thermal black oxide finish on these screws handled the shop grime without any rust spotting after a week of use. Threading them into my fixture plates was smooth, and the 9-inch length gave me just enough reach for a deep stack. They're solidly built and worth the price for a nine-pack.

Olivia E. ★★★★★

I needed extra-long bolts for a jig build, and the 9-inch length on these screws saved me from having to stack washers. The black oxide finish also seems durable and hasn't chipped during installation.

Elizabeth G. ★★★★☆

Had a bit of trouble getting the hex key to seat perfectly at first, but once it did, the black oxide finish on these 9-inch socket cap screws looks solid and professional for my jig build.