Mutual Screw & Supply

1/4-20 X 3-1/4" Hex Machine Bolts | Steel Zinc Plated | Partially Threaded (100 / Pkg.)

1/4-20 X 3-1/4" Hex Machine Bolts | Steel Zinc Plated | Partially Threaded (100 - Main image
$3.35 $5.32 In stock

1/4-20 X 3-1/4" 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: 1/4-20
  • Length: 3-1/4"
  • Thread: Partially Threaded
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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 (4.4 / 5 · 5 reviews)

Violet ★★★★★

I've been using these bolts for a few small framing projects, and the partially threaded shank makes it easy to get a secure hold without the threads binding. The zinc plating seems durable so far, and the 3-1/4 inch length is just right for joining two 2x4s.

Abigail ★★★★★

The unthreaded grip section on these 1/4-20 bolts gave me a much cleaner fit when sandwiching a steel bracket to a wooden frame—no wasted thread digging into the wood. Zinc plating looks even and hasn't chipped after a week of outdoor use, though the package count was spot-on at 100. Definitely a so

Hannah K. ★★★★★

These bolts have a solid grip length that made mounting a metal bracket feel much more secure than using fully threaded ones. The zinc coating looks clean and held up fine against my wrench.