Gdt Tolerance Zones: profile_tolerance_zone
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 | notes | process category | profile zone type |
|---|---|---|---|---|---|
| profile_tolerance_zone | profile_unequally_disposed | Profile unequally disposed zone | Unequally disposed: e.g. 0.8 (U) 0.2 means 0.6 inside and 0.2 outside true profile; requires UZ and U modifiers; used for casting allowances | profile_surface | unequally_disposed |
| profile_tolerance_zone | profile_unilateral_inside | Profile unilateral inside zone | Unilateral inside: all tolerance zone inside true profile; offset inward by full tolerance value | profile_surface | unilateral_inside |
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