A lap screw, also called a stitch screw, is a self-tapping screw used to “stitch” together metal panels where they overlap, as well as to flashing, gutters and trim. Most fastener lines J and J Welding and Fabrication carries offer a coordinating lap screw in either 3/4” or 7/8”.

    WoodZAC™ #12 x 3/4” Lap

  • Head Style Size:5/16” Hex Washer Head
  • Point:Sharp Point
  • Washer:EPDM Seal Washer
  • Sizes:3/4"
  • Other:Metal to Wood or Metal to Metal Light Gauge

    WoodGrip™ #12XG
    Lap

  • Head Style Size: 1/4” Hex Washer Head
  • Point:Sharp Point
  • Washer: Bonded Washer or EPDM Control Seal Washer
  • Sizes:3/4"
  • Other:Metal to Wood

    DirectSeal #12-14 Woodbinder Stitch

  • Head Style Size:1/4” Cupped Hex Washer Head
  • Point:M-Bit Mini Drill Point
  • Washer:EPDM Seal Washer
  • Sizes:3/4"
  • Other:Metal to Wood

    ZAC™ #14 Stitch Self Driller 1

  • Head Style Size:3/8” or 5/16” Hex
  • Point:SD1
  • Washer:Thick EPDM Seal Washer
  • Sizes:7/8”
  • Other: Metal to Metal


    Impax™ 1/4-14 Stitch Self Driller 1

  • Head Style Size:5/16” AF Hex
  • Point:SD1
  • Washer:Bonded Washer or Sealer Cupped
  • Sizes:7/8”
  • Other: Up to 18ga; Metal to Metal

    SteelZip 1/4-14 Stitch Self Driller 1

  • Head Style Size:5/16” Hex Drive
  • Point:SD1
  • Washer:EPDM Seal Washer
  • Sizes:7/8”, 1 1/8”
  • Other: Up to 18 ga; Metal to Metal

    #12-11 Bi-Metal
    Stitch

  • Head Style Size:5/16” Hex Washer Head
  • Point:SD1
  • Washer:14mm Stainless Bonded Sealer Washer
  • Sizes:1”
  • Other:Tap .031” to .060”; Available without Washer; Metal to Metal

    1/4-20 Bi-Metal
    Lap

  • Head Style Size: 5/16” HWH
  • Point:SD2
  • Washer:16mm Stainless Bonded Sealer Washer
  • Sizes:1 1/8”
  • Other:Tap .031” to .060”; Metal to Metal

Contact Us

  • Head Office: 364 Recker Hwy, Auburndale, FL 33823, USA

  • Phone: +1 813-754-0771

  • Email: info@jnjwelding.com

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