Mutual Screw & Supply

5/8-18 X 3" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc | Partially Threaded (25 / Pkg.)

5/8-18 X 3" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc | - Main image
$142.44 $200.62 In stock

5/8-18 x 3" hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • Grade L9 Alloy Steel Yellow Zinc construction
  • Partially Threaded
  • Hex head for wrench or socket drive
  • Made in the USA
  • Sold in packs of 25

Specifications

  • Thread Size: 5/8-18
  • Length: 3"
  • Threads Per Inch: 18
  • Material: Alloy Steel
  • Grade: Grade L9
  • Finish: Yellow Zinc CR+3
  • Thread Style: Partially Threaded
  • Pack Quantity: 25
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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)

Ellie O. ★★★★★

Needed some heavy-duty bolts for a piece of assembly line equipment, and these Grade L9s handled the torque perfectly. The yellow zinc coating on the partially threaded shank gives them a nice, clean look that also resists rust. They seat tightly with a standard wrench.

Charlotte N. ★★★★★

Installed these on a hydraulic press rebuild last weekend and the partially threaded shank made alignment way easier than fully threaded bolts. The yellow zinc coating looks durable and the L9 steel feels seriously tough, no stripping or stretching under heavy torque.

Jason ★★★★★

Needed these for a heavy machinery repair and the Grade L9 alloy steel feels like serious overkill—in the best way. The partial threading made alignment a lot easier than I expected with fully threaded bolts.