Mutual Screw & Supply

1-3/8-6 X 9" Socket Cap Screws | Hex Socket Drive | Partially Threaded | Alloy Steel Thermal Black Oxide

1-3/8-6 X 9" Socket Cap Screws | Hex Socket Drive | Partially Threaded | Alloy - Main image
$71.75 $112.11 In stock

These 13/8-6 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: 13/8-6
  • 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: 13/8-6
  • Length: 9"
  • Threads per inch: 6
  • Measurement type: Inch
  • Pack quantity: 1 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 (4.6 / 5 · 5 reviews)

Julian ★★★★★

The black oxide finish on these socket cap screws really helps them resist rust in my shop environment. Had to swap out some standard bolts on my press tooling and these threaded in smooth and tight. For 9-inch partially threaded screws, the hex drive held up perfectly under my torque wrench without

Hannah ★★★★★

Installed these in a heavy jig I’m building, and the 9” length gave me just enough thread engagement without bottoming out. The thermal black oxide finish feels smooth and hasn’t shown any rust after a week in the shop.

Nicholas ★★★★★

The hex socket drive grips the Allen key perfectly, no slippage even under heavy torque on my jig setup, and the black oxide finish already shows it'll resist rust well. These 9-inch long screws are exactly what I needed for a deep fixture assembly, and the partially threaded portion lets me clamp p