Lap-Stitch Screws
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”.

- 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
WoodZAC™ #12 x 3/4” 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
WoodGrip™ #12XG
Lap

- 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
DirectSeal #12-14 Woodbinder Stitch

- Head Style Size:3/8” or 5/16” Hex
- Point:SD1
- Washer:Thick EPDM Seal Washer
- Sizes:7/8”
- Other: Metal to Metal
ZAC™ #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
Impax™ 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
SteelZip 1/4-14 Stitch Self Driller 1

- 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
#12-11 Bi-Metal
Stitch

- 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