Made in Japan, this high precision square is accurate, reliable and well made.
Angle tolerance +/- (20 + ℓ / 10) μm where ℓ is the nominal length (mm)
Annealed tool steel for maximum dimensional stability (not corrosion resistant)
Manufactured in accordance with Japanese Industrial Standards (JIS) B7526 Grade 2
Precision ground measurement surfaces
Please note: Unlike BS939 the Japanese engineering standard B7526 doesn't call for a burr groove at the internal corner.
| Square size | External Measurements (mm) | Accuracy better than |
| 50mm | 50 x 40 x 10 | 7 microns (0.27 thou) |
| 75mm | 75 x 50 x 13 | 9.5 microns (0.37 thou) |
| 100mm | 100 x 70 x 15 | 12 microns (0.47 thou) |
| 150mm | 150 x 100 x 19 | 17 microns (0.67 thou) |
| 200mm | 200 x 130 x 22 | 22 microns (0.87 thou) |
| 250mm | 250 x 164 x 22 | 27 microns (1.06 thou) |
| 300mm | 300 x 200 x 25 | 32 microns (1.25 thou) |
