Mutual Screw & Supply

5/16-18 X 5/8" Hex Head Cap Screws | Grade 8 Steel Yellow Zinc | Fully Threaded (1800 / Pkg.)

5/16-18 X 5/8" Hex Head Cap Screws | Grade 8 Steel Yellow Zinc | Fully Threaded - Main image
$112.5 $170.46 In stock

5/16-18 x 5/8" hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • Grade 8 Steel Yellow Zinc construction
  • Fully Threaded
  • Hex head for wrench or socket drive
  • Sold in packs of 1800

Specifications

  • Thread Size: 5/16-18
  • Length: 5/8"
  • Threads Per Inch: 18
  • Material: Steel
  • Grade: Grade 8
  • Finish: Yellow Zinc CR+6
  • Thread Style: Fully Threaded
  • Pack Quantity: 1800
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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

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Delivery costs

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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Returning an item

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

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Customer Reviews (5.0 / 5 · 5 reviews)

Aurora ★★★★★

The yellow zinc coating looks sharp and even on every single bolt, and the threads are clean all the way down. I used these with a socket wrench on a frame assembly and didn't have a single cross-thread or stripped head out of the whole box.

Lucy ★★★★★

These bolts fit perfectly into my tractor's mounting brackets for a new attachment. The Grade 8 steel gives me confidence they won't shear under heavy load, and the threads are clean all the way through.

Samuel ★★★★★

The yellow zinc finish is holding up way better than the plain steel bolts I’ve used before, and the fully threaded design makes alignment a snap. These grade 8s torqued down clean on my equipment frame without a single stripped head.