FastenMaster FMTLOK04-12 TimberLOK 4" Structural Wood Screws | 12 ct

Fastenmaster FMTLOK04-12

•Heavy-Duty Structural Wood Screw - Ideal for attaching rafters, trusses, landscape timbers, decks, fences, headers, and stair stringers
•No Predrilling Required - Installs faster and easier than traditional 3/8" lag screws
•Countersinking Head Design - Seats cleanly for a flush, professional finish in framing and exterior applications
•ACQ-Approved Corrosion Resistance - Engineered for long-term durability in treated lumber and outdoor environments
•IBC/IRC Code Compliant - Tested and supported by engineering data conforming to ICC-ES ESR-1078
•Lifetime Performance Guarantee - Structural strength and corrosion resistance guaranteed when installed per FastenMaster guidelines

Fastenmaster FMTLOK04-12

FastenMaster TimberLOK is a heavy-duty structural wood screw engineered for demanding framing and exterior construction applications. Designed to replace traditional 3/8" lag screws, TimberLOK installs without predrilling, delivering faster, easier, and more efficient fastening in rafters, trusses, landscape timbers, decks, fences, stair stringers, headers, and more.

The countersinking head seats cleanly for a professional finish, while the ACQ-approved corrosion-resistant coating ensures long-term durability in treated lumber and exterior environments. TimberLOK is fully IBC/IRC code compliant and supported by engineering data conforming to ICC-ES ESR-1078, guaranteeing reliable structural performance when installed according to FastenMaster guidelines.

Built for contractors who need strength, speed, and consistency, TimberLOK delivers lifetime-guaranteed performance across a wide range of wood-to-wood structural connections. (Not recommended for use within 1000 feet of saltwater.)