JiangYin XiangGu Hardware Products Co.,Ltd
JiangYin XiangGu Hardware Products Co.,Ltd Focus on supplying high quality fasteners.
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These steel screws have corrosion-resistant finishes. Also known as lag bolts, they have a hex head for a secure grip with a wrench. They press threads into material for a tight, secure hold. To prevent splitting, drill a pilot hole slightly smaller than the screw. Length is measured from under the head.
Black-oxide steel screws have a coating that protects the steel from rusting in dry environments and blends in with dark surfaces.
Zinc-plated steel screws resist corrosion in wet environments.
Hot-dipped galvanized steel screws have a thick coating for better corrosion resistance than zinc-plated steel screws. They're a good choice for ACQ-treated (arsenic-free) lumber.
| Hexagon Head Wood Screws | |||||||
| DIN 571 | |||||||
 | |||||||
| d(mm) | ds(mm) | k(mm) | s(mm) | ||||
| min | max | Nom | min | max | min | max | |
| 4 | 3.52 | 4 | 2.8 | 2.5 | 3.1 | 6.64 | 7 |
| 5 | 4.52 | 5 | 3.5 | 3.13 | 3.88 | 7.64 | 8 |
| 6 | 5.52 | 6 | 4 | 3.63 | 4.38 | 9.64 | 10 |
| 7 | 6.42 | 7 | 5 | 4.63 | 5.38 | 11.57 | 12 |
| 8 | 7.42 | 8 | 5.5 | 5.13 | 5.88 | 12.57 | 13 |
| 10 | 9.42 | 10 | 7 | 6.55 | 7.45 | 16.57 | 17 |
| 12 | 11.3 | 12 | 8 | 7.55 | 8.45 | 18.48 | 19 |
| 16 | 15.3 | 16 | 10 | 9.55 | 10.45 | 23.16 | 24 |
| 20 | 19.3 | 20 | 13 | 12.1 | 13.9 | 29.16 | 30 |