Mutual Screw & Supply

3/8-16 X 4" Hex Head Cap Screws | Grade 8 Steel Zinc Plated | Partially Threaded (300 / Pkg.)

3/8-16 X 4" Hex Head Cap Screws | Grade 8 Steel Zinc Plated | Partially - Main image
$112.13 $151.53 In stock

3/8-16 x 4" hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • Grade 8 Steel Zinc Plated construction
  • Partially Threaded
  • Hex head for wrench or socket drive
  • Sold in packs of 300

Specifications

  • Thread Size: 3/8-16
  • Length: 4"
  • Threads Per Inch: 16
  • Material: Steel
  • Grade: Grade 8
  • Finish: Zinc Plated
  • Thread Style: Partially Threaded
  • Pack Quantity: 300
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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)

Chloe ★★★★★

The zinc plating on these cap screws looks like it will hold up well in my shop environment. I used them on a heavy equipment repair and the Grade 8 steel felt solid under the wrench. This package of 300 should last me a while.

David A. ★★★★★

Finally got around to swapping out some worn bolts on my press jig and these Grade 8s threaded in smoothly with a socket. The zinc plating on the partially threaded shank looks clean and should resist rust better than the old black oxide ones.

Samuel M. ★★★★★

These Grade 8 bolts hold up exactly as promised under heavy torque; the zinc coating is uniform and the threading is clean on every single one. I used about half of them to rebuild the frame on my press and they’ve got zero signs of wear so far. For this price per pack you’re getting serious hardwar