This type of screw is mainly used in construction environments where corrosion resistance is required. The surface treatment is Hot Ruspert coating, available in 500-hour or 1000-hour grades, capable of passing a 1000-hour salt spray test. Popular sizes include 4.8 × 19 mm and 4.8 × 25 mm, with packaging of 5,000 pieces per carton.
The tail is designed in a drill-point shape, so these truss head screws and washer head screws can be installed without pre-drilling, significantly improving work efficiency. They are also ideal as metal stud screws and truss screws for a wide range of fastening applications.
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| #6*3/8 | 3.5*9.5 | 
| #6*7/16 | 3.5*11 | 
| #8*1/2 | 4.2*13 | 
| #8*5/8 | 4.2*16 | 
| #8*3/4 | 4.2*19 | 
| #8*1 | 4.2*25 | 
| #8*1 1/4 | 4.2*32 | 
| #8*1 5/8 | 4.2*41 | 
| #8*2 | 4.2*50 |