The main bearing dimensions conform to DIN 618/ISO 3 245. The thin-walled outer rings adopt the dimensional and geometrical accuracy of the housing bore.
In the case of bearings without inner ring, the enveloping circle dimension Fw is used instead of the radial internal clearance. The enveloping circle is the inner inscribed circle of the needle rollers in clearance-free contact with the outer raceway.
Once fitted, the enveloping circle diameter Fw is approximately in tolerance zone F8
The enveloping circle is determined in accordance with the inspection dimensions in the table; see table Inspection dimensions for drawn cup needle roller bearings.
Inspection dimensions for INA drawn cup needle roller bearings
|
Enveloping circle diameter |
Bearing outside diameter |
Ring gauge bore Actual dimension |
Enveloping circle diameter |
|
|---|---|---|---|---|
|
Fw mm |
D mm |
mm |
Upper deviation um |
Lower deviation um |
| 3 | 6,5 | 6,484 | +24 | +6 |
|
4 5 6 |
8 9 10 |
7,984 8,984 9,984 |
+28 +28 +28 |
+10 +10 +10 |
|
7 8 9 10 |
11 12 13 14 |
10,980 11,980 12,980 13,980 |
+31 +31 +31 +31 |
+13 +13 +13 +13 |
|
12 12 13 14 15 16 17 18 |
16 18 19 20 21 22 23 24 |
15,980 17,980 18,976 19,976 20,976 21,976 22,976 23,976 |
+34 +34 +34 +34 +34 +34 +34 +34 |
+16 +16 +16 +16 +16 +16 +16 +16 |
|
20 22 25 28 30 |
26 28 32 35 37 |
25,976 27,976 31,972 34,972 36,972 |
+41 +41 +41 +41 +41 |
+20 +20 +20 +20 +20 |
|
32 35 40 45 50 |
39 42 47 52 58 |
38,972 41,972 46,972 51,967 57,967 |
+50 +50 +50 +50 +50 |
+25 +25 +25 +25 +25 |
|
55 60 |
63 68 |
62,967 67,967 |
+60 +60 |
+30 +30 |
