Mutual Screw & Supply

7/8-9 X 4-1/2" Heavy Hex Cap Screws | USA Made | A307 Grade B Steel Zinc Plated | Partially Threaded (40 / Pkg.)

7/8-9 X 4-1/2" Heavy Hex Cap Screws | USA Made | A307 Grade B Steel Zinc Plated - Main image
$171.25 $280.74 In stock

A307 Grade B Steel Zinc Plated hex head cap screws, partially threaded, size 7/8-9 x 4-1/2". 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: 4-1/2"
  • Threads Per Inch: 9
  • Material: A307 Grade B Steel Zinc Plated
  • Finish: Zinc Plated CR+3
  • Thread Style: Partially Threaded
  • Pack Quantity: 40
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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)

Matthew ★★★★★

I needed some heavy-duty bolts for a steel beam repair and these 7/8-9 x 4-1/2" hex cap screws fit the bill perfectly. The partially threaded design grabbed nicely without cross-threading on the nut.

Ava Q. ★★★★★

The threading is crisp and the zinc coating looks even across all forty pieces — no flaking or rough edges out of the box. I’ve used these on a couple of equipment mounts and the partially threaded design grabs tight without any wobble.

Leo I. ★★★★★

Ordered these for a large framing project on the farm — the heavy zinc coating held up well against the rain during assembly. The partial threading made them grip tight without stripping the steel plates.