Mutual Screw & Supply

5/16-18 X 3-1/2" Hex Head Cap Screws | Grade 5 Steel Yellow Zinc | Partially Threaded (100 / Pkg.)

5/16-18 X 3-1/2" Hex Head Cap Screws | Grade 5 Steel Yellow Zinc | Partially - Main image
$47.51 $66.92 In stock

5/16-18 x 3-1/2" hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • Grade 5 Steel Yellow Zinc construction
  • Partially Threaded
  • Hex head for wrench or socket drive
  • Sold in packs of 100

Specifications

  • Thread Size: 5/16-18
  • Length: 3-1/2"
  • Threads Per Inch: 18
  • Material: Steel
  • Grade: Grade 5
  • Finish: Yellow Zinc CR+6
  • Thread Style: Partially Threaded
  • Pack Quantity: 100
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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 I. ★★★★★

I've been using these to reassemble an old piece of shop equipment, and the partially threaded design on the 3-1/2" length bites really well. The hex head takes a socket without stripping, which is exactly what I needed for those tight spots.

Emily ★★★★★

The yellow zinc finish on these grade 5 bolts is holding up great on my trailer hitch setup, and the partially threaded design grabs perfectly without bottoming out. The hex heads seated cleanly with a socket wrench, no stripping even at torque. Pack of 100 will last me years of projects.

Henry V. ★★★★★

I needed a batch of partially threaded 5/16-18 bolts for a machinery repair, and these grade 5 hex heads fit the bill perfectly. The yellow zinc coating looks durable and the threads engaged smoothly without any binding.