Mutual Screw & Supply

#4-40 X 3/8" Red Patch Socket Cap Screws | Hex Socket Drive | 18/8 Stainless Steel (200 / Pkg.)

#4-40 X 3/8" Red Patch Socket Cap Screws | Hex Socket Drive | 18/8 Stainless - Main image
$14.85 $19.8 In stock

These #4-40 x 3/8" socket cap screws are manufactured from 18/8 Stainless Steel, featuring a hex socket drive. They are well suited to machinery, tooling, jigs, and precision assemblies.

  • Material and finish: 18/8 Stainless Steel
  • Drive: Hex Socket
  • Thread size: #4-40
  • Length: 3/8"
  • Applications: Machinery, tooling, jigs, and precision assemblies

Specifications

  • Product type: Socket Cap Screws
  • Material: 18/8 Stainless Steel
  • Finish: Plain
  • Grade: 18/8
  • Drive type: Hex Socket
  • Thread size: #4-40
  • Length: 3/8"
  • Threads per inch: 40
  • Measurement type: Imperial
  • Features: Red Patch
  • Pack quantity: 50 per package

Please note: This item is excess stock and is sold non-cancelable, non-refundable, and non-returnable. Please call us with any questions about this item before ordering.

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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 (4.0 / 5 · 5 reviews)

Riley ★★★★★

For a delicate jig I rebuilt, these little stainless steel screws threaded perfectly without any binding, and the red nylon patch held them tight after final adjustment. It’s a relief to have a full pack of exactly the right length on hand for small precision work.

Lucy U. ★★★★★

I’ve been using these #4-40 x 3/8" socket cap screws for a small jig I’m building, and the red nylon patch lock really holds tight without any extra thread locker. The hex socket drive makes them easy to install in tight spaces, and the stainless steel feels solid for precision work.

Olivia W. ★★★★☆

I needed a small batch for a 3D-printed fixture and these fit perfectly, though the red patch holds a bit tighter than I expected. The hex socket drive worked fine with my Allen key, and the stainless finish looks clean.