Mutual Screw & Supply

1"-8 X 3-1/2" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc | Partially Threaded (10 / Pkg.)

1"-8 X 3-1/2" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc - Main image
$145.28 $230.6 In stock

1"-8 x 3-1/2" 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 10

Specifications

  • Thread Size: 1"-8
  • Length: 3-1/2"
  • Threads Per Inch: 8
  • Material: Alloy Steel
  • Grade: Grade L9
  • Finish: Yellow Zinc CR+3
  • Thread Style: Partially Threaded
  • Pack Quantity: 10
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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 (4.6 / 5 · 5 reviews)

Ella G. ★★★★★

The yellow zinc coating on these L9 bolts is holding up great on my press, no rust after a week in the shop. They threaded cleanly into the tapped hole and the hex head fits a standard wrench perfectly.

Charlotte Y. ★★★★★

The partial threading made all the difference when I needed to bolt down a heavy motor mount—no wasted grip length fighting a full thread. They drove in smooth with a socket and the zinc coat still looks factory-fresh after a few months in my shop.

Hazel ★★★★★

Put these on my big trailer hitch after the old bolts started rusting. The USA-made L9 alloy steel feels a lot tougher than the grade 5s I'd used before, and the yellow zinc finish is a nice touch for weather resistance.