Mutual Screw & Supply

5/16-18 X 1-1/8" Hex Head Cap Screws | Grade 8 Steel Yellow Zinc | Fully Threaded (1200 / Pkg.)

5/16-18 X 1-1/8" Hex Head Cap Screws | Grade 8 Steel Yellow Zinc | Fully - Main image
$105.43 $159.74 In stock

5/16-18 x 1-1/8" hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • Grade 8 Steel Yellow Zinc construction
  • Fully Threaded
  • Hex head for wrench or socket drive
  • Sold in packs of 1200

Specifications

  • Thread Size: 5/16-18
  • Length: 1-1/8"
  • Threads Per Inch: 18
  • Material: Steel
  • Grade: Grade 8
  • Finish: Yellow Zinc CR+6
  • Thread Style: Fully Threaded
  • Pack Quantity: 1200
Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy
If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy
Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy
Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (5.0 / 5 · 5 reviews)

Christopher ★★★★★

Needed a solid batch of fasteners for a trailer repair job, and these grade 8 cap screws with the yellow zinc held up perfectly under heavy torque. The hex head gave my socket a good bite without rounding off, and having 1,200 in one package means I won't run out for a while.

Robert ★★★★★

These are perfect for our assembly line jigs; the grade 8 hardness holds up under constant torque without stripping. The yellow zinc coating gives them a consistent, corrosion-resistant finish that looks good too.

Madison P. ★★★★★

Bought these for a machine rebuild and the yellow zinc finish is holding up nicely without any corrosion. The Grade 8 hardness makes them feel rock solid when torquing down, and the fully threaded length gave me plenty of grip. Exactly what I needed for the job.