Mutual Screw & Supply

5/16-18 X 1-1/4" Hex Head Cap Screws | Grade 5 Steel Yellow Zinc | Fully Threaded (1100 / Pkg.)

5/16-18 X 1-1/4" Hex Head Cap Screws | Grade 5 Steel Yellow Zinc | Fully - Main image
$84.71 $112.95 In stock

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

  • Grade 5 Steel Yellow Zinc construction
  • Fully Threaded
  • Hex head for wrench or socket drive
  • Sold in packs of 1100

Specifications

  • Thread Size: 5/16-18
  • Length: 1-1/4"
  • Threads Per Inch: 18
  • Material: Steel
  • Grade: Grade 5
  • Finish: Yellow Zinc CR+6
  • Thread Style: Fully Threaded
  • Pack Quantity: 1100
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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)

Scarlett ★★★★★

I needed a full box of 1100 for a frame assembly and these worked perfectly with a socket driver. The threads are clean and consistent, so they drove in smoothly without binding.

Stella C. ★★★★★

The yellow zinc coating is a nice touch, didn’t expect it to look this clean for bulk hardware. These fully threaded 5/16-18s grab evenly along the whole shaft, made reattaching a jig really straightforward.

Charlotte Q. ★★★★★

The hex head on these is well-formed and didn't strip when I cinched them down with a socket. Got a whole box for a fraction of what the hardware store wanted, and the yellow zinc coating looks uniform across all pieces.