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Position Tolerance Spec Table
Position Tolerance KS Specifications — 4 sizes
KS A ISO 1101
Tolerances specifying position accuracy relative to a datum: position, concentricity, and symmetry.
Selection Guide
Controls feature location relative to datums: position, concentricity, symmetry. Applied to bolt hole patterns (PCD), mold guide pins, connector pin arrays. MMC bonus tolerance reduces manufacturing cost.
KSPosition Tolerance
4 sizes| Name | Type | Symbol | Datum | Definition | Application |
|---|---|---|---|---|---|
| Position | Location Tolerance | ⌖ | Required | Spot, , Surface | Bore , Bolt |
| Concentricity | Location Tolerance | ◎ | Required | Shaft Shaft SeamSpot | Shaft Bore, |
| Concentricity | Location Tolerance | ◎ | Required | Shaft Shaft | Shaft, Pin |
| Symmetry | Location Tolerance | ⌯ | Required | SeamSurface/Shaft | , Slot, Type |
Key Features
- Allowable deviation from True Position of a feature in the datum coordinate system
- Three types: position, concentricity, symmetry; compound datum (A|B|C) for 3-axis control
- MMC bonus tolerance: position tolerance increases as actual size departs from maximum material
Key Applications
Bolt hole patterns (PCD), bearing housing concentricity, dovetail symmetry, connector pin arrays, mold guide pins
FAQ
What does position tolerance ø0.2 mean?
Hole center must lie within a ø0.2mm diameter circle from True Position. With MMC, larger actual hole size allows greater position tolerance (bonus tolerance).