Mutual Screw & Supply

3/8-16 X 4" Hex Machine Bolts | Steel Zinc Plated | Partially Threaded (50 / Pkg.)

3/8-16 X 4" Hex Machine Bolts | Steel Zinc Plated | Partially Threaded (50 / - Main image
$7.5 $10 In stock

3/8-16 X 4" Hex Machine Bolts in Steel Zinc Plated. A hex head machine bolt with a partially threaded shank per ASME B18.2.1, providing an unthreaded grip length for bolted connections through clearance holes.

  • Partially threaded shank for a smooth bearing surface in the shear plane of bolted joints
  • Hex head for wrench-driven, high-torque installation
  • Zinc plating for everyday corrosion resistance

Specifications

  • Type: Hex Machine Bolts
  • Head Style: Hex
  • Material: Steel
  • Finish: Zinc Plated
  • Thread Size: 3/8-16
  • Length: 4"
  • Thread: Partially Threaded
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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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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)

Ruby Q. ★★★★★

The partial threading on these bolts is perfect for aligning steel brackets where you need a clean grip section before the threads bite. All 50 came uniformly plated with no stripped threads in the box, and they cinched down solid on my trailer frame.

Hazel ★★★★★

Used these to secure a heavy-duty workbench frame I’m building—the partially threaded shank made it easy to get a tight, stable connection without any slippage. The zinc coating seems sturdy and hasn’t shown any rust after a few days in a damp garage.

Samuel X. ★★★★★

Had to replace some worn bolts on a trailer hitch, and these 4-inch machine bolts fit perfectly into the existing holes. The zinc plating looks clean and seems durable so far.