Mutual Screw & Supply

3/8-16 X 4" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc | Partially Threaded (50 / Pkg.)

3/8-16 X 4" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc | - Main image
$107.69 $160.73 In stock

3/8-16 x 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 50

Specifications

  • Thread Size: 3/8-16
  • Length: 4"
  • Threads Per Inch: 16
  • Material: Alloy Steel
  • Grade: Grade L9
  • Finish: Yellow Zinc CR+3
  • Thread Style: Partially Threaded
  • Pack Quantity: 50
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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)

David G. ★★★★★

I needed some heavy-duty fasteners for a trailer repair, and these grade L9 bolts didn't strip or snap under my impact wrench. The partial threading made aligning the first few threads way easier than with fully threaded ones.

Miles B. ★★★★★

These threads cut clean and the zinc finish looks uniform across all fifty. They seated perfectly in my shop press jig without any galling, and the partial threads gave me solid clamping force where I needed it.

Elizabeth ★★★★★

I'm using a set on a heavy-duty trailer hitch build, and the fact that these are partially threaded really helps with alignment and clamping force. The yellow zinc finish on these L9s looks tough and shiny right out of the pack.