Gdt Tolerance Zones: it_grade_by_size
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 | tolerance value um (um) |
|---|---|---|---|---|---|---|---|
| it_grade_by_size | it_grade_0_3_IT10 | IT10 tolerance 0-3mm | IT10 | 0 | 3 | drilling | 40 |
| it_grade_by_size | it_grade_0_3_IT11 | IT11 tolerance 0-3mm | IT11 | 0 | 3 | rough_machining | 60 |
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