Mutual Screw & Supply

5/16-18 X 3" Hex Machine Bolts | Steel Zinc Plated | Partially Threaded (100 / Pkg.)

5/16-18 X 3" Hex Machine Bolts | Steel Zinc Plated | Partially Threaded (100 / - Main image
$12.58 $19.36 In stock

5/16-18 X 3" 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: 5/16-18
  • Length: 3"
  • 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 (5.0 / 5 · 5 reviews)

Sebastian ★★★★★

Zinc plating is holding up well so far, no rust after a few days in a slightly damp garage. The partial threading made it easy to get a clean, tight connection on my steel brackets without the threads binding.

Christopher A. ★★★★★

The unthreaded grip length on these bolts made aligning my steel brackets much easier than dealing with fully threaded hardware. Zinc coating looks clean and consistent across all 100 pieces, and the partial threads bit smoothly into my tapped holes.

Victoria ★★★★★

Installed these on a trailer hitch project, and the unthreaded grip section made alignment a breeze. All 100 bolts had clean, consistent threads and the zinc held up fine during tightening.