Screw Size Chart
Have you got the correct screw size?
Please use this measuring ruler and quick guide to help you choose the correct size screw for your needs Generally screw lengths are taken from the part of the screw that is embedded into the substrate. Measure from the tip to... • Countersinking heads are measured to the top of the screw.
200mm
200mm
190mm
190mm
180mm 170mm
• Non countersinking heads are measured to under the head.
180mm 170mm
160mm
160mm
150mm
150mm
140mm 130mm 120mm
Gauge width (mm) No.6 (3.5)
No.8 (4.0)
No.9 (4.5)
140mm
No.10 (5.0)
No.12 (6.0)
130mm 120mm
110mm
110mm
100mm
100mm
90mm
90mm
80mm
80mm
70mm
70mm
60mm
60mm
50mm
50mm
40mm
40mm
30mm
30mm
20mm
20mm
10mm
10mm
0mm
0mm
* these are approximate sizes only for reference purposes.