Gdt Tolerance Zones: geometric_tolerance_zone_shape
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 | tolerance zone shape |
|---|---|---|---|---|---|
| geometric_tolerance_zone_shape | zone_cylindrical | Cylindrical tolerance zone | Cylindrical zone for position of coaxial features; zone diameter = tolerance value; axis must lie within zone; default for position on cylindrical features | position_coaxial | cylindrical |
| geometric_tolerance_zone_shape | zone_spherical | Spherical tolerance zone | Spherical zone for spherical features or true position in 3D; prefix S dia on callout; zone is sphere of diameter equal to tolerance | position_spherical_surface | spherical |
| geometric_tolerance_zone_shape | zone_total_width | Total width tolerance zone | Width zone for slots/non-circular features; zone is between two parallel planes distance = tolerance; or two parallel lines for line profile | position_slot | total_width |
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