Material: HT200-250
Standard: GB6092-85
Specification: see attached form or customize
Surface treatment: hand-scraped or finish-milling
Foundry process: sand casting or centrifugal castings
Molding type: resin sand molding
Painting: primer painting
Surface coating: pickling oil and plastic-lined or covered with anticorrosion paint
Working temperature: (20±5)℃
Precision grade: 1-2
Packaging: plywood box
Technical specification of cast iron square ruler:
| Specification (mm) | Parallelism of relative measuring surface | Verticality of two adjacent sides | Linearity of measuring surfaceundefined | |||
| Precision grade (um) | ||||||
| 1 | 2 | 1 | 2 | 1 | 2 | |
| 200×200×30 | 8 | 16 | 3 | 6 | 8 | 16 |
| 250×250×30 | 9 | 18 | 8 | 8 | 9 | 18 |
| 300×300×30 | 10 | 20 | 9 | 9 | 10 | 20 |
| 400×400×40 | 12 | 24 | 10 | 10 | 12 | 24 |
| 500×500×50 | 14 | 28 | 12 | 12 | 14 | 28 |
| 600×600×50 | 16 | 32 | 14 | 14 | 16 | 32 |
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