Cangzhou Famous International Trading Co., Ltd
we are precision family
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Granite leveling rulers are also known as granite straight ruler,granite leveling rulers are manufactured according to International standard to ensure the high quality.The products are always made into ribbed plate or box-type, our company use the scraping process to improve the precision of the products. Since the products are customized, so the customers can customize the size according to the actual needs.
Therefore, precision black granite leveling ruler export to foreign countries is popular in all the world.
For in specting the straightness and flatness
| Pecification (mm) | Beeline tolerance of working surface (um) | Squareness between working surface | Tolerance of h.w.between a matched pair | |||
| Precision grade (um) | ||||||
| 00 | 0 | 00 | 0 | 00 | 0 | |
| 160x25x16 | 1.5 | 3 | 20 | 40 | 1.5 | 3 |
| 250x40x25 | 2 | 4 | 30 | 60 | 2 | 4 |
| 400x63x40 | 4 | 8 | 40 | 80 | 4 | 8 |
| 630x100x63 | 6 | 12 | 50 | 100 | 6 | 12 |
