Mutual Screw & Supply

5/16-18 X 2-1/4" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc | Partially Threaded (100 / Pkg.)

5/16-18 X 2-1/4" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow - Main image
$75.08 $125.13 In stock

5/16-18 x 2-1/4" hex head cap screws for machinery, equipment assembly and general industrial fastening.

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

Specifications

  • Thread Size: 5/16-18
  • Length: 2-1/4"
  • Threads Per Inch: 18
  • Material: Alloy Steel
  • Grade: Grade L9
  • Finish: Yellow Zinc CR+3
  • Thread Style: Partially Threaded
  • Pack Quantity: 100
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Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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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 (4.6 / 5 · 5 reviews)

Thomas ★★★★★

I needed some high-strength bolts for a heavy-duty jig, and these Grade L9 alloy steel screws have been perfect — the yellow zinc coating already looks like it will resist rust well. The partial threading made alignment much easier on my equipment.

Joseph ★★★★★

These are holding up great on my equipment jig. The yellow zinc finish is exactly what I wanted and the partial threading makes alignment a breeze.

Sebastian ★★★★★

Finally, a bolt that doesn't strip the moment I lean on it – the Grade L9 alloy steel is noticeably tougher than the usual hardware store stuff. The yellow zinc finish is even and didn't flake off during a rough install. These held firm on my milling machine table right out of the package, which is