Gdt Tolerance Zones: it grade by size
it grade 0 3 IT7 to it grade 180 250 IT7
GD&T tolerance zone data per ASME Y14.5-2018 and ISO 286-1:2010 — covering IT tolerance grades (IT1-IT14) with tabulated values in micrometers for nominal sizes 0-500mm; position tolerance at MMC using floating fastener formula T=H-F and fixed fastener formula T=(H-F)/2 for M3-M12 bolts per ISO 273 clearance holes; MMC bonus tolerance examples; datum feature simulators (RFS/RMB, MMB, LMB) per ASME Y14.5-2018 Section 7.11; profile tolerance zone types (bilateral, unilateral outside/inside, unequally disposed); geometric tolerance zone shapes (cylindrical, total width, spherical); and typical IT grades achievable by manufacturing process (lapping, grinding, turning, milling, drilling, casting).
| tolerance type | record id | description | it grade | nominal size lower mm (mm) | nominal size upper mm (mm) | process category | standard | tolerance value um (um) |
|---|---|---|---|---|---|---|---|---|
| it grade by size | it grade 0 3 IT7 | IT7 tolerance 0-3mm | IT7 | 0 | 3 | precision machining | ISO 286-1:2010 Table 1 | 10 |
| it grade by size | it grade 0 3 IT8 | IT8 tolerance 0-3mm | IT8 | 0 | 3 | milling turning | ISO 286-1:2010 Table 1 | 14 |
| it grade by size | it grade 0 3 IT9 | IT9 tolerance 0-3mm | IT9 | 0 | 3 | drilling | ISO 286-1:2010 Table 1 | 25 |
| it grade by size | it grade 10 18 IT6 | IT6 tolerance 10-18mm | IT6 | 10 | 18 | lapping honing | ISO 286-1:2010 Table 1 | 11 |
| it grade by size | it grade 10 18 IT7 | IT7 tolerance 10-18mm | IT7 | 10 | 18 | precision machining | ISO 286-1:2010 Table 1 | 18 |
| it grade by size | it grade 10 18 IT8 | IT8 tolerance 10-18mm | IT8 | 10 | 18 | milling turning | ISO 286-1:2010 Table 1 | 27 |
| it grade by size | it grade 10 18 IT9 | IT9 tolerance 10-18mm | IT9 | 10 | 18 | drilling | ISO 286-1:2010 Table 1 | 43 |
| it grade by size | it grade 120 180 IT7 | IT7 tolerance 120-180mm | IT7 | 120 | 180 | precision machining | ISO 286-1:2010 Table 1 | 40 |
| it grade by size | it grade 120 180 IT8 | IT8 tolerance 120-180mm | IT8 | 120 | 180 | milling turning | ISO 286-1:2010 Table 1 | 63 |
| it grade by size | it grade 180 250 IT7 | IT7 tolerance 180-250mm | IT7 | 180 | 250 | precision machining | ISO 286-1:2010 Table 1 | 46 |
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