Mutual Screw & Supply

3/8-16 X 3-1/2" Machine Screws | Flat Head Slotted Drive | 18/8 Stainless Steel (100 / Pkg.)

3/8-16 X 3-1/2" Machine Screws | Flat Head Slotted Drive | 18/8 Stainless Steel - Main image
$114.93 $155.31 In stock

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

Specs

  • Dimensions: 3/8-16 3-1/2"
  • Drive type: Slotted
  • Head style: Flat Head
  • Material: 18/8 Stainless Steel
  • Thread: 3/8-16 UNC (coarse)

Features

  • Machine-thread screws for use with nuts or tapped holes
  • Flat head profile
  • Slotted drive
  • 18/8 Stainless Steel construction
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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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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)

Timothy T. ★★★★★

Packed the threads perfectly for my outdoor equipment repair. The flat head sits flush in the countersink and the 18/8 stainless has held up through a week of rain with zero rust.

Christopher ★★★★★

Needed a full-length stainless machine screw for a salty-air dock repair and these 3½-inchers fit tight without any corrosion worries. The flat head sits flush like I wanted on the wood.

Andrew I. ★★★★★

The 3/8-16 threads cut cleanly into my pre-tapped holes without any binding, and the flat head sits perfectly flush. I’ve been using them on a damp exterior gate for a few weeks now with zero signs of rust.