Mutual Screw & Supply

5/16-24 X 6-1/2" Hex Head Cap Screws | USA Made | Grade 8 Steel Yellow Zinc (250 / Pkg.)

5/16-24 X 6-1/2" Hex Head Cap Screws | USA Made | Grade 8 Steel Yellow Zinc - Main image
$417.09 $651.7 In stock

5/16-24 x 6-1/2" hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • Grade 8 Steel Yellow Zinc construction
  • Hex head for wrench or socket drive
  • Made in the USA
  • Sold in packs of 250

Specifications

  • Thread Size: 5/16-24
  • Length: 6-1/2"
  • Threads Per Inch: 24
  • Material: Steel
  • Grade: Grade 8
  • Finish: Yellow Zinc CR+3
  • Pack Quantity: 250
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)

Daniel J. ★★★★★

Needed to replace some worn bolts on a trailer hitch and these fit perfectly with a 5/16" socket. The Grade 8 steel feels much tougher than the old hardware I took off.

Samuel E. ★★★★★

Went through a whole box mounting brackets on a press and every one seated flush without a single stripped thread. The yellow zinc coating held up nicely even where I had to wrench them down hard. Grade 8 strength gives me confidence these won't snap under load.

Lucy ★★★★★

The threads were perfectly clean on every single bolt, which saved me time fighting with a die. The yellow zinc coating looks great and these grade 8s definitely feel stronger than the hardware store stuff. Perfect for the bracket I was bolting onto my tractor frame.