Mutual Screw & Supply

1/4-28 X 3/8" Hex Head Cap Screws | USA Made | Grade 8 Steel Yellow Zinc (3300 / Pkg.)

1/4-28 X 3/8" Hex Head Cap Screws | USA Made | Grade 8 Steel Yellow Zinc (3300 - Main image
$481.05 $801.75 In stock

1/4-28 x 3/8" hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • Grade 8 Steel Yellow Zinc construction
  • Hex head for wrench or socket drive
  • Made in the USA
  • Sold in packs of 3300

Specifications

  • Thread Size: 1/4-28
  • Length: 3/8"
  • Threads Per Inch: 28
  • Material: Steel
  • Grade: Grade 8
  • Finish: Yellow Zinc CR+3
  • Pack Quantity: 3300
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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)

Henry O. ★★★★★

I needed some tough fasteners for a heavy-duty jig I’m building, and the hex heads on these Grade 8 screws let me really torque them down without stripping. The whole pack of 3,300 came clean and well-coated with that yellow zinc, so they’ll hold up in my shop. Great value for the density and streng

John ★★★★★

The yellow zinc finish on these is flawless—every single head in the box has a consistent, even coating that looks like it came off a quality line. I used about a hundred of them on a fixture build today and the hex heads grabbed the socket perfectly with zero stripping. 3300 pieces for this price i

Penelope S. ★★★★★

Got the whole box of 3300 and every single one has clean, uniform threads — my socket grabs them without any wobble. The yellow zinc finish has held up fine so far on the machine frame I'm bolting together, and the Grade 8 rating gives me peace of mind for the torque I'm putting on them.