Meet the FastenMaster FMTLOK04-50 TimberLOK 4" — a purpose-built wood fastener engineered for durable, flush-fitting joints in deck framing, fencing, and post-to-beam connections. Its sharp point and aggressive threads bite into even dense woods without predrilling, delivering faster installations with stronger shear performance than traditional 3/8" galvanized lag screws. The unique countersinking head sits flush, creating clean, professional-looking joints on every wood-to-wood project. Whether you’re replacing galvanized spikes in raised beds, landscaping features, or retaining walls, TimberLOK locks in quickly and securely.

Why TimberLOK 4" stands out

• Predrill-free installation — a sharp point and aggressive threads cut directly into wood, saving time and labor on each anchor.
• Superior shear strength — engineered to deliver higher shear values than traditional 3/8" galvanized lag screws, even in tough timber species.
• Flush, professional finish — a countersinking head design hugs the surface for clean deck frames, fences, and post-to-beam connections.
• Versatile for outdoor build-outs — ideal for deck framing, fence aanleg, raised beds, landscaping features, and retaining walls where steady, long-lasting joints matter.
• American-made craftsmanship — built to meet the demands of professional installers who value reliability and local manufacturing.
• Includes a free driver bit — each 50-count box includes a 5/6 inch driver bit to get you going right away.

Who should use TimberLOK 4"

Professional builders, remodelers, landscapers, and serious DIYers who want fast, dependable wood-to-wood connections without predrilling will find TimberLOK 4" essential. It shines on projects where time, strength, and a clean finished appearance matter—think outdoor living spaces, garden structures, tiered planters, and sturdy fencing across wind-prone settings.

Specifications at a glance

• Length: 4 inches
• Box count: 50 pieces
• Included: free 5/6 inch driver bit
• Origin: American-made

Practical tips for best results

To maximize performance, drive TimberLOK screws straight and steady to maintain the thread engagement. Let the fastener do the work—avoid pounding or forcing from angles that could strip threads. Use the included driver bit to ensure consistent torque and a flush finish, then backfill with appropriate wood sealant or stain to extend the life of outdoor connections. For heavier loads or structural framing, pair TimberLOK with proper joist or header sizing and confirm alignment before installation.

TimberLOK fasteners are the reliable, American-made choice when you need fast, strong, and tidy wood-to-wood connections. Add the FMTLOK04-50 to your toolkit and experience quicker builds, fewer call-backs, and professional-grade results on every project.