Radial ball bearings will accommodate moderate to heavy radial loads and low to moderate thrust loads in either direction.
Deep groove radial bearings are manufactured as open type bearings for oil or grease lubrication. They are also available with metal shields and/or seals for use where moderate contamination is present in the operation.
Angular contact bearings are single row types used where radial and thrust loads are combined in the same application. They provide sufficient internal clearances to assume a specific contact angle under thrust loading and are available with angles of 15, 30 and 40 degrees.
Double row bearings are manufactured both as filling slot and Conrad types, in light and medium series. The filling slot type has higher load capacity but the Conrad type provides a quieter operation and should be used when noise is a consideration.
Self-Aligning bearings are manufactured with two rows of balls and one continuous spherical raceway in the outer ring. This allows for limited misalignment of the shaft and housing.
Maximum capacity bearings are filling slot type bearings used in applications involving heavy radial loads and low speeds where thrust loads are comparatively low. The incorporated filling slots in the inner and outer rings so they can be loaded with additional balls for greater capacity.
Mast guide bearings are bearings with a high load capacity, specially designed for use in fork lift trucks. These bearings are similar to single row or double row deep groove bearings but the outer race has a very thick cross-section which performs as a wheel or tire. Mast guide bearings can withstand heavy radial loads and occasional thrust loads. Mounted on the fork carriage they provide smooth action as the forks are raised and lowered.
Integral shaft bearings include a shaft with bearing races machined on its OD The outer bearing ring, cage and rolling elements are mounted directly on the shaft and an inner ring is not required. These are commonly referred to as water pump bearings since that is a major application for them.
Special bearings include Inch Series bearings, bearings made specifically for automotive air compressor applications and bearings made with special bore, width, or OD
Description
NSK
SKF
FAG
P/N
Inch
Rxx
Rxx
Rxx
Extra small
6xx
6xx
6xx
Extra light
60xx
60xx
60xx
Light
62xx
62xx
62xx
Medium
63xx
63xx
63xx
Extra thin section
68xx
618xx
618xx
Very thin section
69xx
619xx
619xx
Thin section
16xxx
16xxx
16xxx
Maximum capacity, light
BL2xx
2xx
2xx
Maximum capacity, medium
BL3xx
3xx
3xx
Suffix
Two seals (contact)
DDU
2RS
2RSR
One seal (contact)
DU
RS
RSR
Two shields
ZZ
2Z
2ZR
One shield
Z
Z
ZR
Snap ring
NR
NR
NR
Steel cage
BLANK
J
BLANK
Brass Cage
M
M
M
Heat stabilized 200C
X28
S1
S1
Tight clearance
C2
C2
C2
Normal clearance
BLANK
BLANK
BLANK
Loose clearance
C3
EM(C3)
C3
Extra loose clearance
C4
C4
C4
Electric motor grade
E
QE6
--
Description
NSK
SKF
FAG
P/N
Light
72xx
72xx
72xx
Medium
73xx
73xx
73xx
Heavy
74xx
74xx
74xx
Suffix
40 deg. contact
B
B
B
30 deg. contact
A
--
--
25 deg. contact
A5
ACD
E
15 deg. contact
C
CD
C
Machined brass cage
M
M
Mp
pressed brass cage
Y
Y
Yp
polyamide cage
TY
p
TVp
Steel cage
W
J
Jp
Flush ground faces
G
G
UO,UA
petrochemical
BMpC
BECBM
--
Roller bearing cross-references
Glossary - Cylindrical Roller Bearings
NU style single row - NU style bearings have two machined flanges on the outer ring and no flanges on the inner ring.
N Style single row - N style bearings have two machined flanges on the inner ring and no flanges on the outer ring, with rollers and cage on the inner ring. Like the NU style, the N has no thrust load carrying capability.
NJ style single row - NJ style bearings have two machined flanges on the outer ring and a machined flange on one side of the inner ring. The roller and cage assembly is in the outer ring. The integral flange on the inner ring allows this bearing to carry an axial load.
NF style single row - NF style bearings have two machined flanges on the inner ring and one flange on the outer ring, with roller and cage on the inner ring. Like the NJ bearing, these bearings have some thrust load capability.
NH style single row - NH style bearings have two machined flanges on the outer ring and a machined flange on one side of the inner ring. A special-design inner ring allows use of a stabilizing ring on the non-flange side. As a result, these bearings can carry axial loads in both directions. The roller and cage assembly is mounted in the outer ring.
NUP style single row - NUP style bearings are similar to the NJ style and come with a special ring often called a thrust collar. Mounted on the non-flange side of the inner ring, the thrust collar allows the bearing to carry an axial load in both directions. The thrust collar extends out of the bearing on one side, so the dimension across the inner ring is slightly greater than that of the outer ring.
Double row styles (NN, NNU) - Double Row cylindrical roller bearings are denoted by two N's within the part number (e.g., NN or NNU). The dimensions for these can be found in the Super Precision section of this catalog and can be ordered with standard precision.
S-Type - Sealed-Clean Bearings for chain conveyors demonstrate a high efficiency under high temperatures and wet conditions for a longer period with an improved sealing system. These bearings are packed with a quality grease of high thermal resistance and durability.
Continuous Caster Roller Bearings - These are 2-split bearing units of a highly reliable design and feature a long service life. Cylindrical roller bearings with self-aligning rings having a proper alignment function.
Four Row Cylindrical Roller Bearings - Are also popular roll neck bearings providing several benefits. First, the inner ring is separable form the outer ring and rollers which allows the inner ring to remain with the roll during grinding processes. This assures precise concentricity and negligible run-out providing for high rolling accuracy. Secondly, this design allows for greater radial load carrying and higher operating speeds. Four row cylindricals must be used in combination with a thrust bearing which is usually a two row taper, angular contact ball bearings, or a deep groove ball bearing depending on the thrust load present.
Description
NSK
SKF
FAG
Prefix
Single row, no flanges on outer ring
N
N
N
Single row, no flanges on inner ring
NU
NU
NU
Single row, 1 flange inner
NJ
NJ
NJ
Single row, 1 flange outer
NF
NF
--
Single row, 1 flange inner, with retaining ring
NUP
NUP
NUP
Single row, 1 flange inner w/stabilizing ring
NH
NH
NH
Double row, flanges outer/flanges inner
HJ
HJ
HJ
NNU/NN
NNU/NN
NNU/NN
P/N
Light
2XX
2XX
2XX
Medium
3XX
3XX
3XX
Heavy
4XX
4XX
4XX
Extra Light
10XX
10XX
10XX
Light, Wide
22XX
22XX
22XX
Medium, Wide
23XX
23XX
23XX
Suffix
Ployamide cage
T
P
TVP2
Composite high temp (200°C) cage
T7
--
--
Machined brass cage
M
M
M,M1
Pressed steel cage
W,WS
J
JP1
High capacity design
E
EC
E
Full complement (no cage)
V
V
V
Tight clearance
C2
C2
C2
Normal clearance
BLANK
BLANK
BLANK
Loose clearance
C3
C3
C3
Extra loose clearance
C4
C4
C4
Glossary - Spherical Roller Bearings
Spherical Roller Bearings - Are double row self-aligning bearings capable of carrying heavy radial loads combined with moderate thrust loads in either direction. They are extremely resistant to shock loads and their self-aligning feature allows full capacity loading despite shaft deflection.
Continuous Caster Rollers - These are 2-split bearing units of a highly reliable design and feature a long service life. Cylindrical roller bearings with self-aligning rings having a proper alignment function.
Spherical Roller Bearings TL Series - Excellent performance with high temperature equipment. High strength to prevent inner ring fractures.
Shaker Screen Bearings - Are designed for vibrating applications such as screens, feeders and compactors. These are self-aligning spherical roller bearings designed to accommodate the high loads, static and dynamic misalignment characteristics, and severe environmental conditions inherent in these applications.
Triple Ring Bearings - Are specially designed for use with controlled crown rolls used extensively in the paper industry. These high load capacity bearings provide “shaft within shaft” operation, while simplifying the surrounding structure and installation.
Description
NSK
SKF
FAG
P/N
Very Light
239xx
239xx
239xx
Light
230xx
230xx
230xx
Light, Wide
240xx
240xx
240xx
Medium
231xx
231xx
231xx
Medium, Wide
241xx
241xx
241xx
Heavy
222xx
222xx
222xx
Heavy, Wide
232xx
232xx
232xx
Extra Heavy
213xx
213xx
213xx
Extra Heavy, Wide
223xx
223xx
223xx
Suffix
Bronze case, one piece, guide ring
CAM,AM
CA,CACM
M
Bronze cage, two piece, guide flange
M
MC
MB
Steel cage, two piece, guide ring
C,CD
CJ,CC
BLANK
Polyamide cage, two piece
H
--
TVPB
Tapered bore 1:12
K
K
K
Tapered bore 1:30
K30
K30
K30
Carburized steel, complete bearing
g
ECD
W209
Carburized steel, inner ring only
g3
ECB
W209B
Lube groove & holes outer ring
E4
W33
S
Lube groove & holes outer ring, holes inner ring
E7
W513
Sheading0AB
Holes only outer ring
E3
W20
SY
Holes only inner ring
E5
W26
heading0AB
No relube features
BLANK
BLANK
--
Plugs provided for outer ring holes
E42
W77
heading0
Combination W33, W4, W31
E4P53
W507
--
Combination W33, W31
E4U22
W506
--
Combination W33, W26, W31
E7U22
W509
Sheading0A
Outer ring w/extra close running accuracy
P52
C04
T52BN
Inner ring w/extra close running accuracy
P53
C02
T52BE
Inner & outer ring w/extra close running accuracy
P55
C08
T52BW
Special inspection measures
U22
W31
--
Inner ring & outer ring heat stabilized to 200°C
S11
S1
--
Tight clearance
C2
C2
C2
Normal clearance
BLANK
BLANK
BLANK
Loose clearance
C3
C3
C3
Extra loose clearance
C4
C4
C4
Glossary - Tapered Roller Bearings
Four Row Tapered Roller Bearings Are very popular for use on roll necks. Most of these bearings are composed of two double cones (four Inner ring raceways), a cone spacer, two single cups (one at each end), one double cup (the center two raceways in the outer rings), and two cup spacers. They are very effective at operating under heavy radial and axial loads at low to moderate speeds. NSK four row tapered bearings are standardly supplied with carburized rings and rollers and are compatible with industry standards. “Sealed-Clean” bearings are four row tapers with seals for the harshest of operating environments. NSK's patented design provides the optimum sealing efficiency with only a slight loss of capacity.
Two Row Tapered Roller Bearings Are very common as the back-up thrust bearing in a rolling mill or as the roll neck in lighter duty rolling mills. Two row tapers are designed in a variety of styles for different applications. Converging bearings (TDI, TDIE, TDIS) consist of one double cone and two single cups possibly with a cup spacer. Diverging bearings (TDO, TDOD, TDOC) consist of two single cones, a cone spacer, and one double cup.
Description
NSK
SKF
Timken
FAG
Prefix
Extra heavy
EH
EH
EH
KEH
Heavier than heavy
HH
HH
HH
KHH
Heavy
H
H
H
KH
Heavy medium
HM
HM
HM
KHM
Medium
M
M
M
KM
Light medium
LM
LM
LM
KLM
Light
L
L
L
KL
Lighter than light
LL
LL
LL
KLL
Extra light
EL
EL
EL
KEL
Cup Angle
0° to 23°59'59.99
1xxxx
1xxxx
1xxxx
1xxxx
24° to 25°29'59.99
2xxxx
2xxxx
2xxxx
2xxxx
25°30' to 26°59'59.99
3xxxx
3xxxx
3xxxx
3xxxx
27° to 28°29'59.99
4xxxx
4xxxx
4xxxx
4xxxx
28°30' to 30°29'59.99
5xxxx
5xxxx
5xxxx
5xxxx
30°30' to 32°29'59.99
6xxxx
6xxxx
6xxxx
6xxxx
32°30' to 35°59'59.99
7xxxx
7xxxx
7xxxx
7xxxx
36° to 44°59'59.99
8xxxx
8xxxx
8xxxx
8xxxx
45° up, but not thrust only conforms to AFBMA standard case carburized cup & cone
9xxxx
9xxxx
9xxxx
9xxxx
R
G
Description
NSK
SKF
Timken
FAG
P/N
High capacity design
HR
--
--
--
Light
HR302xx
302xx
302xx
302xx
Medium
HR303xx
303xx
303xx
303xx
Medium, steep angle
HR303xxD
313xx
313xx
313xx
Extra light, wide
HR329xx
329xx
329xx
329xx
very light, wide
HR320xx
320xx
320xx
320xx
Light, wide
HR322xx
322xx
322xx
322xx
Medium, wide
HR323xx
323xx
323xx
323xx
Very light, extra wide
HR330xx
330xx
330xx
330xx
Light, extra wide
HR331xx
331xx
331xx
331xx
Medium, extra wide
HR332xx
332xx
332xx
332xx
Suffix
Medium contact angle
C
B
B
B
Steep contact angle
D
--
--
--
Modified internal design
X
X
X
X
Conforms to ISO 355
J
--
--
A
Glossary-Thrust bearings
Cylindrical roller thrust bearings (TMP) - These are thrust bearings containing cylindrical rollers. They can sustain only axial loads, but they are suitable for heavy loads and have high axial rigidity. The cages are machined brass.
Tapered roller thrust bearings (TT, TTF or V-Flat) - These are thrust bearings containing tapered rollers. TT-type bearings, which have a rib on the housing washer, can accurately guide the shaft in the radial direction. TTF-type bearings, which have no rib on the housing washer, can tolerate some eccentricity during operation.
The ball thrust bearings are designed to handle thrust loads while operating at high speeds. These bearings can be ordered with an aligning seat and aligning washer if misalignment or deflection can not be avoided.
The spherical thrust bearings are designed to handle very heavy thrust loads in one direction while operating at low to moderate speeds. The design of the spherical thrust will also allow for some radial load while thrust load is imposed. The spherical shape of the outer ring raceway makes these bearings excellent for handling misalignment.
Description
NSK
SKF
FAG
P/N
Single direction
511xx
511xx
511xx
Single direction
512xx
512xx
512xx
Single direction
513xx
513xx
513xx
Single direction
514xx
514xx
514xx
Single direction with aligning seat
532xx
532xx
532xx
Single direction with aligning seat
533xx
533xx
533xx
Single direction with aligning seat
534xx
534xx
534xx
Double direction
522xx
522xx
522xx
Double direction
523xx
523xx
523xx
Double direction
524xx
524xx
524xx
Double direction with aligning seat
542xx
542xx
542xx
Double direction with aligning seat
543xx
543xx
543xx
Double direction with aligning seat
544xx
544xx
544xx
Suffix
Steel cage
BLANK
J
FP
Brass cage
M
M
MP
Boundary dimensions adopted to ISO
X
--
X
With self-aligning seat washer
U
U
U
ABEC 5 precision class
P5
P5
P5
Description
NSK
SKF
FAG
Torrington
P/N
Light
292xx
292xx
292xx
292xx
Medium
293xx
293xx
293xx
293xx
Heavy
294xx
294xx
294xx
294xx
Suffix
Steel Cage
H
EJ
E
EJ
Brass Cage
M
M
EMB
EM
Mounted bearing unit cross-references
Glossary
Standard Duty Pillow Blocks bearings are mounted in rigid housings of simple construction. These are the most common pillow blocks and are used extensively for various kinds of power transmission in stationary equipment and machinery.
Standard Duty, Low Base Pillow Blocks are basically the same design as standard pillow blocks, however the lower base provides a lower center of operation. This makes the unit particularly suitable when space between the center and the mounting base is limited.
Cylindrical Cartridge Bearings are designed to provide shaft support where the shaft axis is perpendicular to and passing through a solid support, in a location where the cartridges can be mounted with a press rather than bolt flanges.
Standard Duty, 4-bolt Flange units have square flanges which can be easily attached to a mounting surface with four bolts. This simple method of installation makes this unit convenient for applications where frequent disassembly may be required.
Standard Duty, 4-bolt Flange have the same design as the set-screw type, however the distance between bearing center and flange back face is longer, to provide sufficient clearance to use a bearing with an eccentric locking collar.
Standard Duty 2-bolt Flange units have a housing with an oval flange with two bolt holes for mounting. This type of unit is easily installed and is suitable where mounting space is limited or where it is necessary to minimize the distance between shafts.
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