Mutual Screw & Supply

7/8-9 X 3-1/2" Heavy Hex Cap Screws | USA Made | A307 Grade B Steel Zinc Plated | Partially Threaded (50 / Pkg.)

7/8-9 X 3-1/2" Heavy Hex Cap Screws | USA Made | A307 Grade B Steel Zinc Plated - Main image
$257.3 $378.38 In stock

A307 Grade B Steel Zinc Plated 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 Zinc Plated 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 Zinc Plated
  • Finish: Zinc Plated CR+3
  • Thread Style: Partially Threaded
  • Pack Quantity: 50
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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 (4.8 / 5 · 5 reviews)

Hannah ★★★★★

The partially threaded length saved me from having to add washers on a heavy equipment repair. The zinc coating looks consistent across all 50 pieces, which is a nice touch for the price.

Zoe ★★★★★

These hex bolts held up perfectly when I used them to mount a heavy motor on a piece of industrial equipment. The zinc plating resisted scuffing during tightening, and the partial threading made alignment a breeze.

Steven ★★★★★

The threads cut cleanly into the steel beam without any binding, and the zinc coating looks uniform across all fifty bolts. I've already torqued a dozen into place for a custom trailer hitch, and they're holding firm without any play.