FASTENMASTER HEADLOK HEAVY DUTY FLATHEAD FASTENER - 4-1/2" 12PKTwelve-pack of 4-1/2" HeadLOK structural wood screws for deep-penetration multi-ply fastening. HeadLOK screws eliminate the need for pre-drilling and deliver higher design shear strength than 3/8" lag screws. The large wafer head resists pull-through and sits flush for a clean finish.
- No pre-drilling required - installs faster than lag screws
- Stronger design shear factor than a 3/8" lag screw
- Large wafer head resists pull-through
- Coating rated for use in ACQ-treated lumber
- Code-approved structural fastener (ICC-ES ESR-1078)
- Installs with a Spider drive bit (included)
- 4-1/2" length
- 12-count card
- FastenMaster part number: FMHLGM412-12
Tip: Use for multi-ply beam fastening, ledger boards, deck framing, stair stringers, and other structural wood-to-wood connections.