If a bearing needs to be pressed into a housing, ISO 2768-m is usually too loose. You would need to specify a tighter, individual tolerance (e.g., H7/g6).
The term "medium" specifically refers to one of the tolerance classes defined in the standard, which provides a moderate level of tolerance. iso 2768 medium
For linear dimensions (lengths, external sizes, heights, etc.), the tolerance range increases as the size of the part increases. Here are the specific permissible deviations for ISO 2768-m: ±0.1 mm 3 to 6 mm: ±0.1 mm 6 to 30 mm: ±0.2 mm 30 to 120 mm: ±0.3 mm 120 to 400 mm: ±0.5 mm 400 to 1000 mm: ±0.8 mm 1000 to 2000 mm: ±1.2 mm 2000 to 4000 mm: ±2.0 mm External Radii and Chamfer Heights If a bearing needs to be pressed into
While "medium" is the industry standard, it is not a "one size fits all" solution. For linear dimensions (lengths, external sizes, heights, etc
The "Medium" class represents the sweet spot of modern machining—strict enough to ensure assembly, yet loose enough to maintain economic viability. Proper application of ISO 2768-m is a hallmark of efficient engineering design and professional drafting practice.