Page 41 - NSK_CAT_E1102m_A7-141

FITS AND INTERNAL CLEARANCES

Table 9.6 Fits of Inch Design Tapered Roller Bearings with Shafts Table 9.7 Fits of Inch Design Tapered Roller Bearings with Housings

(1) Bearings of Precision Classes 4 and 2 Units : μm (1) Bearings of Precision Classes 4 and 2 Units : μ m
Remarks
Nominal Bore Diameters d Bore Diameter Shaft Diameter Outside Diameter Housing Bore
Tolerances Tolerances
Nominal Outside Diameters D Tolerances Diameter
& ds over incl.
Operating Conditions Operating Conditions & Ds Tolerances Remarks

over incl.

(mm) 1/25.4 (mm) 1/25.4 high low high low (mm) 1/25.4 (mm) 1/25.4 high low high low

⎯ 76.200 3.0000 +13 0 + 38 + 25 ⎯ 3.0000 76.200 3.0000 +25 0 + 76 + 51
304.800 12.0000 +25 0 + 64 + 38 For bearings with d≤152.4 mm, 76.200 5.0000 127.000
Rotating Inner Normal Loads 76.200 3.0000 609.600 24.0000 +51 0 +127 + 76 clearance is usually larger than CN. Used either 127.000 12.0000 304.800 5.0000 +25 0 + 76 + 51 The outer ring can be easily
Ring Loads 304.800 12.0000 914.400 36.0000 +76 0 +190 +114 on free-end or 304.800 24.0000 609.600 12.0000 +25 0 + 76 + 51 displaced axially.
fixed-end 609.600 914.400 24.0000 +51 0 +152 +102
609.600 24.0000 76.200 3.0000 Rotating Inner Ring Loads 3.0000
304.800 12.0000 5.0000 76.200
Heavy Loads ⎯ 609.600 24.0000 +13 0 + 64 + 38 In general, bearings with a clear- 12.0000 127.000 36.0000 +76 0 +229 +152
Shock Loads 76.200 914.400 36.0000 24.0000 304.800
High Speeds 304.800 3.0000 +25 0 g ance larger than CN are used. ⎯ 609.600 3.0000 +25 0 + 25 0
609.600 12.0000 76.200 3.0000 3.0000 914.400
24.0000 304.800 12.0000 +51 0 g g means that the average The outer ring 76.200 5.0000 5.0000 +25 0 + 25 0 The outer ring can be displaced
609.600 24.0000 position can be 127.000 12.0000 76.200 12.0000 +25 0 + 51
914.400 36.0000 +76 0 +381 +305 interference is about 0.0005 d. adjusted axially. 304.800 24.0000 127.000 24.0000 +51 0 + 76 0 axially.
304.800 25
⎯ 76.200 3.0000 +13 0 + 13 0 The inner ring cannot be displaced axially. 3.0000 609.600 +
304.800 12.0000 +25 0 + 25 5.0000 914.400
Rotating Outer 76.200 3.0000 609.600 24.0000 +51 0 + 51 0 When heavy or shock loads exist, the 609.600 12.0000 36.0000 +76 0 +127 + 51
Ring Loads 914.400 36.0000 +76 0 + 76 0 figures in the above (Rotating inner ring 24.0000 76.200
304.800 12.0000 0 loads, heavy or shock loads) apply. The outer ring ⎯ 127.000 3.0000 +25 0 − 13 − 38
position cannot 76.200 304.800
Normal Loads 609.600 24.0000 be adjusted 127.000 609.600 5.0000 +25 0 − 25 − 51 Generally, the outer ring is fixed
axially. 304.800 914.400 12.0000 +25 0 − 25 − 51 axially.
without Shocks ⎯ +13 0 0 − 13 609.600 24.0000 +51 0 − 25 − 76
+25 0 0 − 25 The inner ring can be displaced 36.0000 +76 0 − 25 −102
76.200 3.0000 +51 0 0 − 51 axially.
+76 0 0 − 76
304.800 12.0000 Rotating Outer Normal Loads ⎯ 3.0000 +25 0 − 13 − 38
609.600 24.0000 Ring Loads The outer ring 76.200
position cannot 127.000
be adjusted 304.800 5.0000 +25 0 − 25 − 51
axially. 609.600
12.0000 +25 0 − 25 − 51 The outer ring is fixed axially.
24.0000 +51 0 − 25 − 76

36.0000 +76 0 − 25 −102

(2) Bearings of Precision Classes 3 and 0 (1) Units : μm (2) Bearings of Precision Classes 3 and 0 (1) Units : μ m

Nominal Bore Diameters d Bore Diameter Shaft Diameter Outside Diameter Housing Bore
Tolerances Tolerances
over incl. Nominal Outside Diameters D Tolerances Diameter
over incl.
Operating Conditions & ds Remarks Operating Conditions & Ds Tolerances Remarks

(mm) 1/25.4 (mm) 1/25.4 high low high low (mm) 1/25.4 (mm) 1/25.4 high low high low

Rotating Inner Precision ⎯ 3.0000 76.200 3.0000 +13 0 + 30 +18 ⎯ Used on free- ⎯ 6.0000 152.400 6.0000 +13 0 +38 +25 The outer ring can be easily
Ring Loads Machine-Tool 76.200 12.0000 304.800 12.0000 +13 0 + 30 +18 A minimum interference of about end 152.400 12.0000 304.800 12.0000 +13 0 +38 +25 displaced axially.
Main Spindles 304.800 24.0000 609.600 304.800 24.0000 609.600 24.0000 +25 0 +64 +38
609.600 914.400 24.0000 +25 0 + 64 +38 0.00025 d is used. 609.600 914.400 36.0000 +38 0 +89 +51 The outer ring can be displaced
Heavy Loads 3.0000 6.0000 +13 axially.
Shock Loads ⎯ 12.0000 76.200 36.0000 +38 0 +102 +64 ⎯ Rotating Inner Ring Loads 12.0000 152.400 6.0000 +13 0 +25 +13
High Speeds 76.200 24.0000 304.800 24.0000 304.800 12.0000 +13 0 +25 +25 Generally, the outer ring is fixed
304.800 609.600 3.0000 +13 0 ⎯ Used on fixed- ⎯ 609.600 24.0000 +25 0 +51 +38 axially.
Precision 609.600 3.0000 914.400 12.0000 +13 0 ⎯ end 152.400 6.0000 914.400 36.0000 +38 0 +76
Machine-Tool 12.0000 304.800 12.0000 0 The outer ring is fixed axially.
Main Spindles ⎯ 24.0000 76.200 24.0000 +25 0 ⎯ 609.600 24.0000 152.400 6.0000 +13 0 +13
76.200 304.800 36.0000 +38 0 ⎯ 304.800 12.0000 +13 0 +25 0 The outer ring is fixed axially.
304.800 609.600 6.0000 609.600 24.0000 +25 0 +25
Rotating Outer 609.600 914.400 3.0000 +13 0 + 30 +18 The outer ring ⎯ 12.0000 914.400 36.0000 +38 0 +38 0
Ring Loads position can be 24.0000
12.0000 +13 0 + 30 +18 adjusted axially. 152.400 152.400 6.0000 +13 0 0 0
304.800 3.0000 304.800 12.0000 +13 0
24.0000 +25 0 + 64 +38 6.0000 609.600 24.0000 +25 0 0 −13
12.0000 914.400 36.0000 +38 0 −25
36.0000 +38 0 +102 +64 609.600 24.0000 0 −25
76.200 3.0000 +13 0 −38
Note (1) For bearings with d greater than 304.8 mm, Class 0 does not exist. The outer ring ⎯ 152.400 6.0000 +13 0 0
position cannot 152.400 304.800 12.0000 +13 0 −25
be adjusted 304.800 609.600 24.0000 +25 0 −13 −25
axially. 609.600 914.400 36.0000 +38 0 −38
−13 −38
Rotating Outer Normal Loads ⎯ −51
Ring Loads The outer ring 76.200 −13
position cannot 152.400
be adjusted 304.800 −13
axially. 609.600
−13

Note (1) For bearings with D greater than 304.8 mm, Class 0 does not exist.

A 86 A 87