Stainless Steel Coach Screws
Stainless steel coach screws, also commonly known as lag screws or lag bolts, are heavy duty woodscrews commonly used in construction and landscaping application.
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Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of stainless steel coach screws in China. With abundant experience, we warmly welcome you to wholesale customized stainless steel coach screws from our factory. For price consultation, contact us.
Coach screw fasteners are a heavy duty bolt type screw with a hexagonal head, they are primarily used for heavy duty fixing of timber and general building materials, they can also be used in conjunction with a plastic or nylon wall plug as a heavy duty concrete fastener. Available in various materials and finishes and screw diameter ranges of 6mm up to 12mm and in lengths up to 200mm.
correct size of coach screw
Diameter d |
Diameter of shank d1 |
Thickness of head k |
Width across flats s |
|||||
|---|---|---|---|---|---|---|---|---|
| max. | min. | max. | min. | max. | min. | |||
| M4 | 4.00 | 3.52 | 3.10 | 2.50 | 7.00 | 6.64 | ||
| M5 | 5.00 | 4.52 | 3.88 | 3.13 | 8.00 | 7.64 | ||
| M6 | 6.00 | 5.52 | 4.38 | 3.63 | 10.00 | 9.64 | ||
| M7 | 7.00 | 6.42 | 5.38 | 4.63 | 12.00 | 11.57 | ||
| M8 | 8.00 | 7.42 | 5.88 | 5.13 | 13.00 | 12.57 | ||
| M10 | 10.00 | 9.42 | 7.45 | 6.55 | 17.00 | 16.57 | ||
| M12 | 12.00 | 11.30 | 8.45 | 7.55 | 19.00 | 18.46 | ||
| M16 | 16.00 | 15.30 | 10.45 | 9.55 | 24.00 | 23.16 | ||
stainless steel Coach Screws General Features
- Hex head type for high torque applications allowing tightening with sockets, wrenches and spanners.
- Tapered gimlet point for easy thread centering in predrilled holes.
- General purpose heavy duty fastener with many benefits in construction and engineering applications.
- Available in multiple finishes, large diameters and long lengths for a flexible fixing solution.
What are coach screws made of?
Most coach screws are made from steel and are offered in a number of different finishes:
Stainless Steel – offers good corrosion resistance making them ideal for outdoor use. They are also highly recommended for use with timber such as Oak and Cedar as these particular types of wood can contain acid and chemicals which can corrode metal. There are two main grades of Stainless Steel:
A2(304) - can handle high and low temperatures
A4(316) - can handle high and low temperatures but has a higher corrosion resistance making them ideal for coastal areas or areas with high pollution.
Bright Zinc Plated – provides moderate corrosion resistance and are suitable for indoor use in a dry environment.
Green Organic Coating – provides a weather resistant coating and are ideal for external use, making them ideal for projects such as decking.
Passivated – this is a two-part deep cleansing process to remove any free iron or other contaminants from the surface. This process helps maximise the corrosion resistance of stainless steel.
Hot Dipped Galvanised – has a thicker Zinc coating to Zinc Plated, giving them a better corrosion resistance, making them more suitable for outdoor use. The thicker coating produces a dull metal finish.
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