DIN571 Lag Bolt Hex Tapping Screw

Different from machine screws with full thread and self-drilling screws for metal connection, DIN571 Lag Bolt Hex Tapping Screw by Wanluo features a unique semi-thread design, sharp coarse thread pitch and conical wood piercing tip. The external hex head structure supports high-torque tightening, effectively solving the problems of insufficient clamping force, easy slipping and shallow gripping of cross-head wood screws. It delivers ultra-stable locking performance for wooden load-bearing structures, outdoor wood facilities and furniture heavy-duty assembly, being a core dedicated fastener for wood engineering construction.

Structural Advantages & Manufacturing Technology

DIN571 Lag Bolt Hex Tapping Screw adopt precision cold forging integral forming process with strict dimensional tolerance control. The standard external hex head matches universal sleeve, pneumatic and electric tools perfectly, enabling high-efficiency and high-torque installation without head rounding or tool slipping. The optimized coarse and deep thread profile greatly enhances wood gripping force, effectively preventing loosening caused by wood shrinkage, vibration and environmental humidity changes. The smooth shank section ensures precise fitting and uniform stress dispersion after penetration, while the sharp conical tip enables fast penetration into wood materials without pre-drilling. Made of high-quality stainless steel and high-strength carbon steel with anti-corrosion treatment, the screws feature excellent toughness, crack resistance and weather resistance, adapting to long-term indoor and outdoor wooden structure fastening.

Product Parameter

Core Advantages & Industrial Applications

1. High-torque hex head design avoids screwdriver slipping and head damage during installation, supporting pneumatic and electric batch operation, greatly improving construction efficiency for large-scale wooden structure projects.

2. Unique coarse deep thread structure forms ultra-strong bite force with wood fibers, effectively resisting loosening caused by wood drying shrinkage, temperature and humidity changes and slight vibration, ensuring long-term stable fastening.

3. Semi-thread optimized design retains smooth shank to protect wood from cracking, avoiding the splitting defect of full-thread screws during tightening, perfectly adapting to solid wood, plywood and wood composite materials.

4. Premium stainless steel and hot-dip galvanized materials deliver excellent weather resistance and corrosion resistance, solving the problem of rust and fastening failure of wooden structure screws used outdoors for a long time.

5. Super pull-out resistance and load-bearing capacity make it ideal for heavy-load wooden connection scenarios, widely used in wooden buildings, outdoor terrace engineering, furniture assembly and wooden bracket fixing.

FAQ

Q1: What is the difference between DIN571 Lag Bolt Hex Tapping Screw and ordinary self-tapping screws?

A1: DIN 571 is professionally designed for wood materials with coarse deep thread and semi-thread structure, featuring super pull-out resistance and anti-cracking performance. Ordinary self-tapping screws are mainly for metal and thin plastic fastening, with insufficient bite force and easy wood cracking when used on wood.

Q2: Do DIN 571 wood screws need pre-drilling?

A2: For conventional soft wood, direct installation is available with sharp conical tip. For hard wood and thick specifications, pre-drilling is recommended to avoid wood splitting and ensure tighter fastening effect.

Q3: Why choose hex head wood screws instead of cross head types?

A3: Hex head structure bears higher tightening torque without slipping or head damage, suitable for heavy-load fastening and batch engineering construction. It has stronger stability and durability than ordinary cross head wood screws.

Q4: Can these screws be used for outdoor wooden structure projects?

A4: Yes. 304/316 stainless steel and hot-dip galvanized versions have excellent salt spray and weather resistance, which can resist outdoor wind and rain erosion, suitable for long-term outdoor wood engineering fastening.

Q5: Do you support customized extra-long DIN 571 wood screws?

A5: Absolutely. We support customizing non-standard length, thread depth and surface treatment to meet personalized fastening requirements of special wooden structures and engineering projects.