Mutual Screw & Supply

5/16-18 X 5/8" Machine Screws | Round Head Slotted Drive | 18/8 Stainless Steel (200 / Pkg.)

5/16-18 X 5/8" Machine Screws | Round Head Slotted Drive | 18/8 Stainless Steel - Main image
$36.41 $58.72 In stock

18/8 (304) stainless steel machine screw offering strong corrosion resistance for indoor, outdoor, and washdown environments. Non-magnetic.

Specs

  • Dimensions: 5/16-18 5/8"
  • Drive type: Slotted
  • Head style: Round Head
  • Material: 18/8 Stainless Steel
  • Thread: 5/16-18 UNC (coarse)

Features

  • Machine-thread screws for use with nuts or tapped holes
  • Round head profile
  • Slotted drive
  • 18/8 Stainless Steel construction
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Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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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 (5.0 / 5 · 5 reviews)

William F. ★★★★★

I needed some stainless hardware for a boat railing repair, and these 304 screws are exactly what I was hoping for. The 5/16-18 threads bit cleanly into the pre-tapped holes without any binding or cross-threading.

Miles ★★★★★

The slotted heads on these screws grip my screwdriver perfectly without stripping, and the 18/8 stainless steel feels solidly built. I used a handful for an outdoor deck repair, and after a week of rain, there is zero sign of rust.

Grace O. ★★★★★

I needed these for a small project mounting hardware outdoors, and the 18/8 stainless steel feels solid and corrosion-resistant. The slotted drive worked fine with a standard screwdriver, and the 200 count means I have plenty left over for future repairs.