Mutual Screw & Supply

3/8-24 X 3-1/2" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc | Partially Threaded (50 / Pkg.)

3/8-24 X 3-1/2" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow - Main image
$111.94 $162.23 In stock

3/8-24 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 50

Specifications

  • Thread Size: 3/8-24
  • Length: 3-1/2"
  • Threads Per Inch: 24
  • 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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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 (5.0 / 5 · 5 reviews)

Lucy ★★★★★

These bolts torqued down exactly as needed for a heavy-duty jig I’m building, and the partial threads gave me just the right grip depth. The hex heads fit a standard socket perfectly.

Ava O. ★★★★★

The yellow zinc coating is flawless across all fifty heads, and threading each one into my jig felt buttery smooth. They’re pricey, but the grade L9 alloy steel gives me confidence these will outlast the machine they’re holding together.

Ellie ★★★★★

I’d been hunting for bolts that wouldn’t snap under heavy torque, and these partially threaded 3/8-24s held tight during my equipment repair. That Grade L9 alloy steel feels noticeably tougher than the usual hardware store stuff, and the yellow zinc coating hasn't shown a hint of rust after a wet we