Mutual Screw & Supply

1/4-20 X 3-1/2" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc | Partially Threaded (100 / Pkg.)

1/4-20 X 3-1/2" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow - Main image
$71.99 $116.11 In stock

1/4-20 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 100

Specifications

  • Thread Size: 1/4-20
  • Length: 3-1/2"
  • Threads Per Inch: 20
  • 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 (4.8 / 5 · 5 reviews)

Emily W. ★★★★★

Used these on a heavy-duty farm gate hinge assembly, and the grade L9 alloy steel definitely holds up better than standard bolts. The partial threading helped get a snug fit without stripping anything, and the yellow zinc coating still looks good after a week of rain.

David ★★★★★

Bought these for a jig build and the partial threading is perfect for clamping—the threads grab cleanly without bottoming out. The hex heads are crisp, so a socket seats every time, and the L9 steel feels plenty stout for what I'm doing.

Sophia ★★★★★

Yellow zinc finish looks great and hasn’t chipped even after cranking them down with an impact wrench on our jig. The hex head grips a socket perfectly, and the partial thread gives just the right bite for the steel plates I’m joining.