Mutual Screw & Supply

5/16-18 X 1-1/4" Hex Machine Bolts | 18/8 Stainless Steel | Partially Threaded (200 / Pkg.)

5/16-18 X 1-1/4" Hex Machine Bolts | 18/8 Stainless Steel | Partially Threaded - Main image
$129.65 $175.2 In stock

5/16-18 X 1-1/4" Hex Machine Bolts in 18/8 Stainless Steel. 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
  • Stainless steel for superior corrosion resistance

Specifications

  • Type: Hex Machine Bolts
  • Head Style: Hex
  • Material: 18/8 Stainless Steel
  • Finish: Plain
  • Thread Size: 5/16-18
  • Length: 1-1/4"
  • 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)

Hannah T. ★★★★★

These bolts are perfect for the trailer hitch I just rebuilt — the 18/8 stainless is noticeably more corrosion-resistant than the zinc-plated hardware I used last time. The partially threaded shank gave me just enough grip length to snug everything up without binding.

Penelope ★★★★★

The unthreaded grip length made aligning my steel brackets so much easier, no more struggling with threads in the wrong spot. Stainless finish looks clean and resists rust, even after a few days in the damp garage. For the price per bolt, these are a solid buy for structural work.

Eva J. ★★★★★

These bolts fit perfectly in my project where I needed the unthreaded grip section to align precisely. The 18/8 stainless steel feels solid and should resist rust well.