For 7300c series angular contact ball bearings, ISO 15 is one of the controlling documents. The sections below describe its scope, the properties it does NOT decide and which standard does decide them, the equivalent designations, and the full size range.
ISO 15 — Scope
ISO 15 fixes the boundary dimensions of metric radial rolling bearings: the bore d, the outside diameter D, the width B and the limiting corner radius r, arranged in diameter and width series so that a bore of 20 mm exists in several standard envelopes (6004, 6204, 6304, 6404). It is the reason a 6204 from any manufacturer drops into the same housing.
What ISO 15 Does Not Fix
It says nothing about how much load the bearing carries, how fast it may run, how accurately it is made or how much clearance it has. Load ratings are calculated to ISO 281, running accuracy is ISO 492 and radial internal clearance is ISO 5753-1.
This division of labour is the thing to carry away from any bearing standard. A boundary dimension standard makes bearings interchangeable; it does not make them equivalent. Two bearings of the same designation from different makers mount in the same seat and are not required to have the same load rating, the same internal design, the same cage or the same speed limit.
Dimensions Supplied to ISO 15
| Designation | Bore d (mm) | Outer diameter D (mm) | Width B (mm) | Chamfer r min (mm) | Contact angle a (deg) |
|---|---|---|---|---|---|
| 7300C | 10 | 35 | 11 | 0.6 | 15 |
| 7301C | 12 | 37 | 12 | 1 | 15 |
| 7302C | 15 | 42 | 13 | 1 | 15 |
| 7303C | 17 | 47 | 14 | 1 | 15 |
| 7304C | 20 | 52 | 15 | 1.1 | 15 |
| 7305C | 25 | 62 | 17 | 1.1 | 15 |
| 7306C | 30 | 72 | 19 | 1.1 | 15 |
| 7307C | 35 | 80 | 21 | 1.5 | 15 |
| 7308C | 40 | 90 | 23 | 1.5 | 15 |
| 7309C | 45 | 100 | 25 | 1.5 | 15 |
| 7310C | 50 | 110 | 27 | 2 | 15 |
| 7311C | 55 | 120 | 29 | 2 | 15 |
| 7312C | 60 | 130 | 31 | 2.1 | 15 |
| 7313C | 65 | 140 | 33 | 2.1 | 15 |
| 7314C | 70 | 150 | 35 | 2.1 | 15 |
| 7315C | 75 | 160 | 37 | 2.1 | 15 |
| 7316C | 80 | 170 | 39 | 2.1 | 15 |
| 7317C | 85 | 180 | 41 | 3 | 15 |
| 7318C | 90 | 190 | 43 | 3 | 15 |
| 7319C | 95 | 200 | 45 | 3 | 15 |
| 7320C | 100 | 215 | 47 | 3 | 15 |
National Equivalents
DIN 616 restates the dimension plan nationally, with the individual bearing types in DIN 625, DIN 628, DIN 630, DIN 635 and DIN 5412; GB/T 273.3 carries the same plan in China.
This product is supplied against ISO 15 / DIN 628-1 / GB/T 292, which names the documents it is made to.
When to Cite ISO 15
ISO 15 is the international reference and the right one to cite on a new drawing or a purchase specification. Adding the national equivalents alongside it costs nothing and makes the requirement legible to a supplier working to DIN or to GB/T.
