Mutual Screw & Supply

7/8-9 X 3-1/2" Heavy Hex Cap Screws | USA Made | A307 Grade B Steel Plain | Partially Threaded (30 / Pkg.)

7/8-9 X 3-1/2" Heavy Hex Cap Screws | USA Made | A307 Grade B Steel Plain | - Main image
$147 $198.65 In stock

A307 Grade B Steel Plain hex head cap screws, partially threaded, size 7/8-9 x 3-1/2". A dependable fastener for machinery, equipment assembly, and general industrial use.

  • A307 Grade B Steel Plain construction
  • partially threaded configuration
  • Hex head for wrench or socket drive
  • For machinery, equipment, and general-purpose fastening

Specifications

  • Thread Size: 7/8-9
  • Length: 3-1/2"
  • Threads Per Inch: 9
  • Material: A307 Grade B Steel Plain
  • Finish: Plain
  • Thread Style: Partially Threaded
  • Pack Quantity: 30
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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 (4.6 / 5 · 5 reviews)

Steven D. ★★★★★

The threading’s nice and clean, so they drove in without any binding when I bolted down some equipment mounts. The 30-count pack of 7/8-9s feels like solid-grade steel for the price, and the partial thread gave me the grip I needed.

Joseph ★★★★★

Used these on a farm gate hinge repair—the 7/8-9 thread grabbed tight in the existing nut without any stripping. The partial threading made it easy to start by hand before wrenching down. Solid American steel that didn't bend under the weight of the gate.

Evelyn ★★★★★

Installing these on a heavy piece of equipment and the partial threading really helped with alignment—no stripping the threads during tightening. They’re solidly made and the hex head gave a perfect grip with my socket.