Mutual Screw & Supply

5/16-18 X 7" Hex Head Cap Screws | USA Made | Grade 8 Steel Yellow Zinc (225 / Pkg.)

5/16-18 X 7" Hex Head Cap Screws | USA Made | Grade 8 Steel Yellow Zinc (225 / - Main image
$428.19 $620.56 In stock

5/16-18 x 7" 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 225

Specifications

  • Thread Size: 5/16-18
  • Length: 7"
  • Threads Per Inch: 18
  • Material: Steel
  • Grade: Grade 8
  • Finish: Yellow Zinc CR+3
  • Pack Quantity: 225
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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 (4.4 / 5 · 5 reviews)

Leo ★★★★★

I needed some long cap screws for a heavy equipment repair, and these 7-inch Grade 8 steel hex heads held up perfectly under the torque. The yellow zinc coating looks clean and seems tough, plus being made in the USA gives me confidence.

Grace ★★★★★

These bolts threaded through my tractor’s frame perfectly, and the hex heads held up under a lot of torque with my impact wrench. The yellow zinc coating looks consistent and clean across all 225 pieces.

Abigail ★★★★★

Finally, bolts that are actually the full 7 inches and thread cleanly without binding. The Grade 8 yellow zinc finish looks solid and should resist rust well for machinery use.