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Metric - Imperial Conversions for Lapidary


Although we live in a metric world now, the lapidary field is one where the old imperial units seem to be hanging on - particularly for saw blades.

Use this handy reference chart to convert between some commonly used measurements - note conversion are approximate for blade diameter as used in the marketplace:

Metric - Imperial Lapidary Measurements
Saw Blade Diameter  
100 mm 4 inches
125 mm 5 inches
150 mm 6 inches
180 mm 7 inches
200 mm 8 inches
250 mm 10 inches
300 mm 12 inches
350 mm 14 inches
400 mm 16 inches
Bore Size (centre hole diameter)  
12.7 mm 0.5 inches (1/2")
15.8 mm 0.625 inches (5/8")
19.0 mm 0.75 inches (3/4")
22.2 mm 0.875 inches (7/8")
25.4 mm 1.0 inch
Blade Thickness  
0.30 mm 0.012 inches (12 thou)
0.35 mm 0.014 inches (14 thou)
0.50 mm 0.020 inches (20 thou)
0.65 mm 0.025 inches (25 thou)
0.8 mm 0.032 inches (32 thou)
1.0 mm 0.040 inches (40 thou)
1.25 mm 0.050 inches (50 thou)
1.5 mm 0.060 inches (50 thou)
1.8 mm 0.070 inches (50 thou)
2.0 mm 0.080 inches (50 thou)