5/16" x 1" Self-Drilling Screws / Unslotted / Hex Washer Head / Steel / Zinc / Bonded Neoprene Washer

#3 Drill Point

Product Details

Part Number: 403240 Carton Quantity: 1,000 pcs Carton Weight: 27.00 lbs
5/16" x 1" Self-Drilling Screws / Unslotted / Hex Washer Head / Steel / Zinc / Bonded Neoprene Washer Please Note: Item in picture may not reflect size and finish of actual part

Technical Specs

Pricing Information

1-2 Carton Price: $842.63 / Carton of 1,000 pcs ($ 0.84263 Each)
3-4 Carton Price: $793.06 / Carton of 1,000 pcs ($ 0.79306 Each)
5+ Carton Price: $749.00 / Carton of 1,000 pcs ($ 0.74900 Each)

This product is currently out of stock. We are expecting new stock on 05/01/2026.

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Product Specs

  • Part Number: 403240
  • Product Category: Self-Drilling Screws
  • Type / Style: Bonded Neoprene Washer
  • Size: #5/16
  • Thread Pitch: 5/16-12
  • Length: 1"
  • Head Style: Hex Washer Head
  • Drive Style: Unslotted
  • Head Diameter: 1/2
  • Head Height: 0.208 - 0.230
  • Width Across Flats: 1/2"
  • Washer Diameter: 0.551 - 0.590
  • Drill Point: #3
  • Full / Partial Thread: Full
  • Driver Size: 1/2
  • Material: Steel
  • Finish: Zinc
  • RoHS: On Request
  • drill_point: #3
  • full_partial_thread: Full
  • head_height: 0.208 - 0.230
  • type_style: Bonded Neoprene Washer
  • width_across_flats: 1/2"

Part # Cross-Reference

  • 3116KWN

More About Part Number 403240

These #5/16 x 1" Self-Drilling Screws feature a Hex Washer Head with an Unslotted Drive and are made from Steel. Self-drilling screws combine a drill-point tip with threaded fastening capability, allowing them to drill, tap, and fasten in a single operation. They feature a Zinc Finish, which provides reliable corrosion protection for general-purpose indoor and light outdoor applications while remaining a cost-effective choice for everyday fastening needs. 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.