Mutual Screw & Supply

5/8-18 X 3-1/4" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow Zinc (150 / Pkg.)

5/8-18 X 3-1/4" Hex Head Cap Screws | USA Made | Grade L9 Alloy Steel Yellow - Main image
$587.87 $864.51 In stock

5/8-18 x 3-1/4" hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • Grade L9 Alloy Steel Yellow Zinc construction
  • Hex head for wrench or socket drive
  • Made in the USA
  • Sold in packs of 150

Specifications

  • Thread Size: 5/8-18
  • Length: 3-1/4"
  • Threads Per Inch: 18
  • Material: Alloy Steel
  • Grade: Grade L9
  • Finish: Yellow Zinc CR+3
  • Pack Quantity: 150
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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 (4.4 / 5 · 5 reviews)

Jacob ★★★★★

Threads started smooth in the tapped holes and the yellow zinc coating looks like it will hold up well in my shop. These are exactly what I needed for some equipment repairs.

Ruby E. ★★★★★

I needed heavy-duty fasteners for a press rebuild and these L9 alloy steel hex heads handled the torque without stripping. The threading was clean right out of the box, and all 150 pieces had consistent zinc coating.

Hazel D. ★★★★★

The yellow zinc coating on these bolts is surprisingly even and durable—no flaking or uneven spots like cheaper packs I've tried. Snugged down a critical bracket on my press with a standard socket, and the hex head engaged perfectly without stripping.