Gdt Tolerance Zones: process_tolerance_typical
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) | notes | process category | tolerance value um (um) |
|---|---|---|---|---|---|---|---|---|
| process_tolerance_typical | proc_tol_die_casting | Die casting typical tolerance | IT12 | 0 | 50 | IT11-IT13 achievable by die casting; Ra 0.8-6.3 um as-cast; better than sand casting | die_casting | 250 |
| process_tolerance_typical | proc_tol_drilling | Drilling typical tolerance | IT10 | 0 | 50 | IT9-IT11 for drilling; Ra 1.6-12.5 um; clearance holes and non-precision bores | drilling | 100 |
| process_tolerance_typical | proc_tol_grinding | Grinding typical tolerance | IT6 | 0 | 50 | IT5-IT7 achievable by cylindrical grinding; Ra 0.1-1.6 um; typical for bearing journals and precision fits | grinding_cylindrical | 9 |
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