Gdt Tolerance Zones: it grade by size
it grade 315 400 IT7 to it grade 50 80 IT9
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 315 400 IT7 | IT7 tolerance 315-400mm | IT7 | 315 | 400 | precision machining | ISO 286-1:2010 Table 1 | 57 |
| it grade by size | it grade 3 6 IT6 | IT6 tolerance 3-6mm | IT6 | 3 | 6 | lapping honing | ISO 286-1:2010 Table 1 | 8 |
| it grade by size | it grade 3 6 IT7 | IT7 tolerance 3-6mm | IT7 | 3 | 6 | precision machining | ISO 286-1:2010 Table 1 | 12 |
| it grade by size | it grade 3 6 IT8 | IT8 tolerance 3-6mm | IT8 | 3 | 6 | milling turning | ISO 286-1:2010 Table 1 | 18 |
| it grade by size | it grade 3 6 IT9 | IT9 tolerance 3-6mm | IT9 | 3 | 6 | drilling | ISO 286-1:2010 Table 1 | 30 |
| it grade by size | it grade 400 500 IT7 | IT7 tolerance 400-500mm | IT7 | 400 | 500 | precision machining | ISO 286-1:2010 Table 1 | 63 |
| it grade by size | it grade 50 80 IT6 | IT6 tolerance 50-80mm | IT6 | 50 | 80 | lapping honing | ISO 286-1:2010 Table 1 | 19 |
| it grade by size | it grade 50 80 IT7 | IT7 tolerance 50-80mm | IT7 | 50 | 80 | precision machining | ISO 286-1:2010 Table 1 | 30 |
| it grade by size | it grade 50 80 IT8 | IT8 tolerance 50-80mm | IT8 | 50 | 80 | milling turning | ISO 286-1:2010 Table 1 | 46 |
| it grade by size | it grade 50 80 IT9 | IT9 tolerance 50-80mm | IT9 | 50 | 80 | drilling | ISO 286-1:2010 Table 1 | 74 |
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