Mutual Screw & Supply

5/16-18 X 1-1/2" Machine Screws | Round Head Slotted Drive | Plain Steel (200 / Pkg.)

5/16-18 X 1-1/2" Machine Screws | Round Head Slotted Drive | Plain Steel (200 / - Main image
$23.41 $38.38 In stock

Plain (uncoated) steel machine screw for general-purpose, indoor fastening where corrosion resistance is not required.

Specs

  • Dimensions: 5/16-18 1-1/2"
  • Drive type: Slotted
  • Head style: Round Head
  • Material: Plain Steel
  • Thread: 5/16-18 UNC (coarse)

Features

  • Machine-thread screws for use with nuts or tapped holes
  • Round head profile
  • Slotted drive
  • Plain Steel construction
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 (4.4 / 5 · 5 reviews)

Ella V. ★★★★★

These are my go-to for jigs and shop fixtures; the round head seats nicely in a countersink without slipping. Having a full box means I don't have to stop mid-project to run out for more.

Kevin O. ★★★★★

Finally found a bulk pack of 5/16-18 round heads that doesn't skimp on thread depth—these seated flush in my steel brackets with zero stripping. The plain finish is exactly what I needed for a dry workshop shelf, and the slotted drive took a standard screwdriver without cam-out. Two hundred of them

Sophia U. ★★★★★

I needed 5/16-18 bolts for a workbench jig, and these 1.5-inch machine screws threaded perfectly into my pre-tapped holes without any binding. The plain steel finish feels solid and should hold up fine indoors.