NTN - Bearing units catalog a-21000-i

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5.2 Tolerances of housings
APPENDICES
TOLERANCES
Table 5.5 Spherical Units bore diameter of housings
Metric μ m
Nominal spherical bore diameter
Standard 0.0001 inch
Da
Da
Deviations ΔDam
Unit: μm/0.0001 inch
Spherical over Bore Diameter of Housings incl.
mm
30
50
Nominal Spherical Bore Diameter
Da Deviations ∆Dam
inch Da mm inch high low high low high low
Tolerance Class H7 Tolerance Class J7 Tolerance Class K7
Over Includes High +25 Low 0 High +14 -11 Low + 7 -18 High Low
1.1811 50 1.9685
30 50 +25 +10 0 0 +14 + 6 - 4 -11 + 3 - +77
-18
1.1811 1.9685 +10 0 +6 -4 +3 -7
50 80 +30 +30 0 0 +18 +18 -12 -12 + 9 -21
1.9685 80 3.1496
+9 -21
1.9685 3.1496 +12 +12 0 0 +7 + 7 - 5 -5 + 4 - +48
-8
80 120 +35 0 +22 -13
+35 0 +22 -13
– –
80 3.1496 3.1496 4.7244120
+14 4.7244
0 +9 -5 - -
+14 0 + 9 - 5
120 180 +40 0 +26 -14
– –
4.7244 7.0866 +16 +40 0 0 +10 +26 -14 -6
120 180 4.7244
- -
250180
+46 7.0866
0 +30 -16
+16 0 +10 - 6
– –
7.0866 9.8425 +18 0 +12 -6
180
250 315 +52 +46 0 0 +36 +30 -16 -16
7.0866 250 9.8425
9.8425 12.4016 +20 +18 0 0 +14 +12 - 6 -6
- -– –
Note: Symbols ∆Dam: Mean spherical bore diameter deviation. Dimensional tolerances for spherical bore diameter of housing are classified as H7 for clearance fit, and J7 for
intermediate fit. The housing bore diameter for a spherical OD bearing +52insert would 0use the following +36fit;
-16
250 9.8425 315 12.4016
- -
Housing bore diameter ≤ 52mm
: K7 fit +20 0 +14 - 6
52mm < Housing bore diameter ≤180mm : J7 fit
Note: 1) Symbols Housing ΔDam: bore diameter Mean spherical > 180mm bore diameter : H7 deviation fit
2) Dimensional tolerances for spherical bore diameter of housing are classified as H7 for clearance fit, and J7 for intermediate fit.
3) The housing bore diameter for a spherical OD bearing insert would use the following fit;
Housing bore diameter ≦ 52mm
: K7 fit
52mm < Units Housing bore diameter ≦180mm : J7 fit
Housing Metric bore diameter mm > 180mm
: H7 fit
Standard inches
Table 5.6 (1) Pillow block housings
Pillow Block Housing Housings numbers
Unit: mm/inch
P, IP, HP, UP
H Deviations
Housing Numbers
P, IP
ΔHs H
PB, PM, PL
P
P, IP, HP, UP, PB, PG, IPG
Deviations
PE, PG, P, IP, PG, IPG P
PM, PL, IPGPE, PG, IPG
∆Hs
201 201 - – - –
203 203 - – - –
204 204 - – - –
205 205 305 305 X05 X05
±0.15
206 306 X06
±0.006
206
306
X06 ±0.15
207 307 X07
207
307
X07
±0.006
208 308 X08
208
308
X08
209 309 X09
209
309
X09
210 310 X10
210
310
X10
211 311 X11
212 312 X12
211
311
X11
213 313 X13
212
312
X12
±0.2
214 314 X14
213
313
X13
±0.008
215 315 X15
214 216 314 316 X14 ±0.2
X16
215 217 315 317 X15 ±0.008
X17
216 218 316 318 X16 X18
217 – 317 319 X17 –
218 – 318 320 X18 X20
– 321 –
-
±0.3
– 319 322 - –
±0.012
- – 320 324 X20 –
- – 321 326 - –
±0.3
- – 322 328 - –
±0.012
Note: - H is height of the 324 shaft center line. This table - can be applied for bearing units
- with dust covers. 326
-
-
328
-
Note: 1) H is height of the shaft center line.
2) This table can be applied for bearing units with dust covers.
Tolerance
class H7
Tolerance
class J7
Pillow Housing Block numbers Resin Housings
PR204
Housing Numbers
PR205
PR206
PR204
PR207
PR205
PR208 PR206
PR207
PR208
Tolerance
class K7
Table 5.6 (2) Pillow block resin housings
H Deviations ΔHs
H
Deviations
±0.25 ∆Hs
±0.010
SφDa
H
Unit: mm/inch
±0.25
±0.010
299