Material: granite
Standard: GB/T 6092-2004
Specification: 100x63-1000x630mm or customize
Hardness of the working surface: HS70
Surface treatment: ground finish
Precision grade: 00-0
Packaging: plywood box
Technical specification of granite L-square ruler:
| Specification(mm) | verticality of measuring surface towards datum | Flatness of measuring surface | Flatness of datum | |||
| Precision grade (um) | ||||||
| 00 | 0 | 00 | 0 | 00 | 0 | |
| 100×63 | 2 | 4 | 1 | 1 | 1 | 1 |
| 160×100 | 2 | 4 | 1 | 2 | 1 | 1 |
| 250×160 | 2.5 | 5 | 1 | 2 | 1 | 2 |
| 400×250 | 3.5 | 7 | 1 | 2.5 | 1 | 2 |
| 630×400 | 4.5 | 9 | 1.5 | 3 | 1 | 2.5 |
| 1000×630 | 6 | 12 | 2.5 | 5 | 1.5 | 5 |
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