4-40 x 1/4" Machine Screws / Unslotted / Hex Washer Head / 18-8 Stainless Steel

Product Details

Part Number: 310103 Carton Quantity: 5,000 pcs Carton Weight: 6.05 lbs
4-40 x 1/4" Machine Screws / Unslotted / Hex Washer Head / 18-8 Stainless Steel Please Note: Item in picture may not reflect size and finish of actual part

Technical Specs

Pricing Information

1-2 Carton Price: $264.05 / Carton of 5,000 pcs ($ 0.05281 Each)
3-4 Carton Price: $248.55 / Carton of 5,000 pcs ($ 0.04971 Each)
5+ Carton Price: $234.70 / Carton of 5,000 pcs ($ 0.04694 Each)

This product is currently out of stock. We are expecting new stock on 09/07/2026.

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Product Specs

  • Part Number: 310103
  • Product Category: Machine Screws
  • Size: 4-40
  • Length: 1/4"
  • Head Style: Hex Washer Head
  • Drive Style: Unslotted
  • Head Diameter: 3/16
  • Head Height: 0.049 - 0.060
  • Width Across Flats: 3/16"
  • Washer Diameter: 0.225 - 0.243
  • Full / Partial Thread: Full
  • Driver Size: 3/16
  • Material: 18-8 Stainless Steel
  • Finish: Plain
  • RoHS: Compliant
  • full_partial_thread: Full
  • head_height: 0.049 - 0.060
  • width_across_flats: 3/16"

Part # Cross-Reference

  • 0404MW188

More About Part Number 310103

These 4-40 x 1/4" Machine Screws feature a Hex Washer Head with an Unslotted Drive and are made from 18-8 Stainless Steel. Machine screws are uniform-diameter threaded fasteners commonly used with tapped holes or nuts in machinery, electronics, and general assembly applications. They feature a Plain Finish, meaning no additional surface coating has been applied; this is commonly used where the part will be painted, plated, or used in controlled indoor environments. The Hex Washer Head incorporates a built-in washer flange beneath the head, increasing bearing surface and improving load distribution while remaining compatible with standard hex drivers. An Unslotted head contains no drive recess, making it useful in permanent or tamper-resistant fastening situations.

⚠ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer.
For more information, go to www.P65Warnings.ca.gov.