Gdt Tolerance Zones: position_mmc_floating_fastener
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 | bonus tolerance formula | description | fastener dia mm (mm) | it grade | mmc hole mm (mm) | notes | process category | t position mm (mm) | tolerance value um (um) | tolerance zone shape |
|---|---|---|---|---|---|---|---|---|---|---|---|
| position_mmc_floating_fastener | pos_float_M10 | T = H - F | Floating fastener position M10 bolt | 10 | IT7 | 10.5 | M10 bolt MMC=10.0mm; clearance hole MMC=10.5mm | assembly_clearance | 0.5 | 0.5 | cylindrical |
| position_mmc_floating_fastener | pos_float_M12 | T = H - F | Floating fastener position M12 bolt | 12 | IT7 | 13 | M12 bolt MMC=12.0mm; clearance hole MMC=13.0mm (coarse medium fit) | assembly_clearance | 0.5 | 0.5 | cylindrical |
| position_mmc_floating_fastener | pos_float_M3 | T = H - F | Floating fastener position M3 bolt | 3 | IT7 | 3.3 | Floating fastener: both parts have clearance holes; T=(H-F) total diametral position tolerance per mating part; M3 bolt MMC=3.0mm clearance hole MMC=3.3mm | assembly_clearance | 0.3 | 0.3 | cylindrical |
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