Mutual Screw & Supply

9/16-18 X 6-1/2" Hex Head Cap Screws | USA Made | Grade 8 Steel Yellow Zinc (70 / Pkg.)

9/16-18 X 6-1/2" Hex Head Cap Screws | USA Made | Grade 8 Steel Yellow Zinc (70 - Main image
$362.29 $548.92 In stock

9/16-18 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 70

Specifications

  • Thread Size: 9/16-18
  • Length: 6-1/2"
  • Threads Per Inch: 18
  • Material: Steel
  • Grade: Grade 8
  • Finish: Yellow Zinc CR+3
  • Pack Quantity: 70
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)

Hannah Z. ★★★★★

These bolts are a solid upgrade for heavy equipment repairs I've been doing. The Grade 8 steel feels noticeably tougher than the hardware store stuff, and the yellow zinc finish hasn't shown any rust yet. Really pleased with the quality for the price.

Lucy ★★★★★

I needed a full 6-1/2" length for a heavy machinery repair, and these Grade 8 bolts handled the torque perfectly with no stripping. The hex head gave my socket a solid grip, and the yellow zinc coating looks durable.

Leo C. ★★★★★

The threads cut clean and the yellow zinc finish looks uniform across all 70 pieces, which honestly impressed me for the price. I needed these for a heavy equipment frame and the Grade 8 rating gives me confidence they won't snap under load.