Mutual Screw & Supply

5/16-18 X 3/4" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc | Fully Threaded (100 / Pkg.)

5/16-18 X 3/4" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow - Main image
$38.96 $60.88 In stock

5/16-18 x 3/4" hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • Grade L9 Alloy Steel Yellow Zinc construction
  • Fully Threaded
  • Hex head for wrench or socket drive
  • Made in the USA
  • Sold in packs of 100

Specifications

  • Thread Size: 5/16-18
  • Length: 3/4"
  • Threads Per Inch: 18
  • Material: Alloy Steel
  • Grade: Grade L9
  • Finish: Yellow Zinc CR+3
  • Thread Style: Fully Threaded
  • Pack Quantity: 100
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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 (4.8 / 5 · 5 reviews)

Hazel ★★★★★

These are exactly what I needed for reassembling my milling attachment and they drove in smooth without any cross-threading. The yellow zinc finish is consistent across all 100, and the hex heads gave my socket a solid bite every time.

John B. ★★★★★

The threads are clean and the yellow zinc finish looks like it’ll hold up on the shop floor where I’ve got them holding a jig together. Being grade L9, I don’t have to worry about them stripping out under load like the cheaper bolts I’ve used before.

Hazel ★★★★★

These are perfect for bolting down a heavy shop vise. The Grade L9 alloy feels much tougher than the standard hardware store bolts I'm used to, and the yellow zinc finish gives them a nice, uniform look.