| | Reason / Action Required | |------------------------------------|------------------------------------------------------| | Threads, press fits, bearings | Needs separate tolerance classes (e.g., 6H, 6g) | | Weldments, castings, forgings | Use ISO 8062 (castings) or separate weld symbols | | Hole-to-hole center distances | Often require tighter control (use ±0.1 mm or GD&T) | | Flatness, straightness, runout | ISO 2768-2 covers form tolerances, but is not included in ISO 2768-1. Specify separately if needed. |
Linear and Angular Dimensions Standard: ISO 2768-1:1989 (and related updates) Applicability: This standard applies to linear and angular dimensions of parts that are produced by machining (metal removal) or forming processes.
| | Reason / Action Required | |------------------------------------|------------------------------------------------------| | Threads, press fits, bearings | Needs separate tolerance classes (e.g., 6H, 6g) | | Weldments, castings, forgings | Use ISO 8062 (castings) or separate weld symbols | | Hole-to-hole center distances | Often require tighter control (use ±0.1 mm or GD&T) | | Flatness, straightness, runout | ISO 2768-2 covers form tolerances, but is not included in ISO 2768-1. Specify separately if needed. |
Linear and Angular Dimensions Standard: ISO 2768-1:1989 (and related updates) Applicability: This standard applies to linear and angular dimensions of parts that are produced by machining (metal removal) or forming processes. iso 2768 medium tolerance