Hebei Kappa Metal Products Co., Ltd. is one of the most reliable manufacturers and suppliers of Wholesale DIN 571 Hex Lag Screws Carbon Steel Zinc Plated Self Tapping Wood Screws in China. Welcome to buy bulk high quality Wholesale DIN 571 Hex Lag Screws Carbon Steel Zinc Plated Self Tapping Wood Screws made in China here from our factory. If you have any enquiry about cooperation, please feel free to email us.
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Dimensions & Tolerances ( Hex Wood screws DIN 571):
| Thread Diameter (d) | Length Range (L) | Head Height (k) | Wrench Size (s) |
|---|---|---|---|
| M5 – M20 | 20 – 300 mm | 2.8 – 13 mm | 7 – 30 mm |
Available Specifications:
Thread Diameter: M5 ~ M20
Length: 20 ~ 300 mm (custom lengths available up to 400 mm)
Thread Type: Coarse wood thread, partial thread
Material:
High-quality Carbon Steel (Q195, Q235, 35# grades available)
Performance grades: 4.8, 8.8
Stainless steel options also available upon request (A2-70, A4-70)
Surface Finish:
Zinc Plated ,provides enhanced corrosion resistance and durability,
Also available: Plain, Black Oxide, Yellow Zinc, Hot Dip Galvanized
The hex head enables secure gripping with wrenches or socket tools, allowing for significantly higher installation torque compared to Phillips or slotted drive systems. This ensures tight, reliable fastening even in heavy load scenarios.
Self-Tapping Wood Thread
The specially designed wood thread features a coarser pitch and sharper profile than standard machine threads. The screw forms its own mating thread by displacing wood fibers ,creating a tight, secure fit This self tapping capability eliminates the need for pre-tapping operations.
Superior Holding Power
The deeper thread profile provides maximum grip in wood, making these screws ideal for load-bearing and structural applications. The partial thread design allows the top piece of wood to be pulled flush against the underlying piece without getting caught on the threads.
Durable Zinc Protection
The zinc plated finish delivers reliable corrosion resistance, extending service life in both interior and exterior environments
Standard Packaging:
Bulk packaging (cartons + pallets)
Small box packaging
Custom packaging available upon request
Customization Options:
Custom lengths and diameters
Alternative surface finishes
Special thread configurations
Private labeling available
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