Mutual Screw & Supply

M3-0.5 X 40mm Hex Head Cap Screws | 18/8 Stainless Steel | Fully Threaded (500 / Pkg.)

M3-0.5 X 40mm Hex Head Cap Screws | 18/8 Stainless Steel | Fully Threaded (500 - Main image
$25.22 $41.35 In stock

M3-0.5 x 40mm hex head cap screws for machinery, equipment assembly and general industrial fastening.

  • 18/8 Stainless Steel construction
  • Fully Threaded
  • Hex head for wrench or socket drive
  • Sold in packs of 500

Specifications

  • Thread Size: M3-0.5
  • Length: 40mm
  • Thread Pitch: 0.5mm
  • Material: 18/8 Stainless Steel
  • Grade: 18/8
  • Finish: Plain
  • Thread Style: Fully Threaded
  • Pack Quantity: 500
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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 (4.4 / 5 · 5 reviews)

Andrew ★★★★★

These M3 screws arrived in a sturdy box and the fully threaded design made it easy to get a tight fit in my 3D printer assembly. The stainless steel feels solid and rust-resistant, exactly what I needed for a long-term project.

Mia G. ★★★★★

I needed some longer M3 screws for a mounting bracket project, and these 40mm ones worked perfectly. The stainless steel feels solid and the hex heads drive in cleanly with my socket wrench. A great value for the price, especially getting 500 pieces.

Nicholas Q. ★★★★★

These are exactly what the product page said they’d be — the 18/8 stainless steel feels solid and the hex head fits a socket wrench cleanly without stripping. I used about a hundred of them for a steel frame project and every single one threaded smoothly into the pre-tapped M3 holes. The fully threa