Types of bearings
Updated: Prior to 2007 Dec 11
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One way to categorize bearings is by the type of rolling element they use. Using this method,
there are five types of bearings:
Ball bearings
Cylindrical roller bearings
Needle roller bearings
Tapered roller bearings
Spherical roller bearings
Ball bearing cross-references
Updated: Prior to 2007 Dec 11
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Glossary
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
Interchange - Single Row Deep Groove Ball Bearings
Description
P/N
NSK
SKF
Torr / Faf
FAG
MRC
Inch
Rxx
Rxx
Sxx
Rxx
Rxx
Extra small
6xx
6xx
3x
6xx
3x
Extra light
60xx
60xx
91xxK
60xx
1xxK
Light
62xx
62xx
2xx
62xx
2xxS
Medium
63xx
63xx
3xx
63xx
3xxS
Extra thin section
68xx
618xx
--
618xx
--
Very thin section
69xx
619xx
93xxK
619xx
--
Thin section
16xxx
16xxx
--
16xxx
--
Maximum capacity, light
BL2xx
2xx
2xxW
2xx
2xxM
Maximum capacity, medium
BL3xx
3xx
3xxW
3xx
3xxM
Two seals (contact)
DDU
2RS
PP
2RSR
ZZ
One seal (contact)
DU
RS
RSR
Two shields
ZZ
2Z
DD
2ZR
FF
One shield
ZR
Snap ring
NR
NR
NR
Steel cage
BLANK J
BLANK
BLANK BLANK
MBR
BRZ
Heat stabilized 200C
X28
S1
--
S1
--
Tight clearance
C2
C2
C2
Tight
Normal clearance
BLANK BLANK R
BLANK Normal
Loose clearance
C3
EM(C3) P
C3
Loose
Extra loose clearance
C4
C4
C4
Extra Loose
Electric motor grade
QE6
--
--
--
Suffix Brass Cage
Interchange - Double Row Ball Bearings
Description
P/N
NSK
SKF
Torr / Faf
MRC
Self-aligning, extra narrow
12xx
12xx
--
--
Self-aligning, narrow
133xx
13xx
--
--
Self-aligning, wide
22xx
22xx
--
--
Self-aligning, extra wide
23xx
23xx
--
--
Double row, maximum compliment, light 32xx
52xxE
52xxW
52xxM (K)
Double row, max. compliment, medium
33xx
53xxE
53xxW
53xxM (K)
Double row, conrad, light
52xx
52xxA
52xxK
52xxC(SBK)
Double row, conrad, medium
53xx
53xxA
53xxK
53xxC (SB)
Two seals
2RS
2RS1
--
--
Two shields
ZZ
2Z
--
FF
Snap ring
NR
NR
polyamide cage
TNG
TN9
pRB
--
Steel cage
BLANK BLANK
BLANK
--
--
Extra capacity
--
--
Tight clearance
C2
C2
C2
Normal clearance
BLANK BLANK R
BLANK
Loose clearance
C3
C3
C3
Extra loose clearance
C4
C4
C4
Suffix Tapered bore
Interchange - Angular Contact (ABEC 1 & 3) Ball Bearings
Description
P/N
Suffix
NSK
SKF
Torr / Faf
FAG
MRC
Light
72xx
72xx
72xx
72xx
72xx
Medium
73xx
73xx
73xx
73xx
73xx
Heavy
74xx
74xx
74xx
74xx
74xx
40 deg. contact
WN
pJ
30 deg. contact
--
--
--
BLANK
25 deg. contact
A5
ACD
--
--
15 deg. contact
CD
--
Machined brass cage
MBR
Mp
BRZ
pressed brass cage
BLANK
Yp
--
polyamide cage
TY
pRC
TVp
BKE
Steel cage
--
Jp
BLANK
Flush ground faces
BLANK
UO,UA
DU
petrochemical
BMpC
BECBM
--
--
pumppac*
Roller bearing cross-references
Updated: Prior to 2007 Dec 11
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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.
Interchange - Cylindrical Roller Bearings
Description
Prefix
NSK
SKF
FAG
Single row, no flanges on outer ring
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
Suffix
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
Ployamide cage
TVP2
Composite high temp (200C) cage
T7
--
--
Machined brass cage
M,M1
Pressed steel cage
W,WS
JP1
High capacity design
EC
Full complement (no cage)
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.
Interchange - Spherical Roller Bearings
Description
NSK
SKF
Torr/FAF
FAG
Very Light
239xx
239xx
239xx
239xx
Light
230xx
230xx
230xx
230xx
Light, Wide
240xx
240xx
240xx
240xx
Medium
231xx
231xx
231xx
231xx
P/N Medium, Wide
241xx
241xx
241xx
241xx
Heavy
222xx
222xx
222xx
222xx
Heavy, Wide
232xx
232xx
232xx
232xx
Extra Heavy
213xx
213xx
213xx
213xx
Extra Heavy, Wide
223xx
223xx
223xx
223xx
CA,CAC
M
YM
MC
BR
MB
Suffi
CAM,A
Bronze case, one piece, guide ring
x
M
Bronze cage, two piece, guide
flange
Description
NSK
SKF
Torr/FAF
FAG
Steel cage, two piece, guide ring
C,CD
CJ,CC
CJ, VJ
BLANK
Polyamide cage, two piece
--
VCF
TVPB
Tapered bore 1:12
Tapered bore 1:30
K30
K30
K30
Carburized steel, complete bearing g
ECD
W40
W209
Carburized steel, inner ring only
g3
ECB
W401
W209B
Lube groove & holes outer ring
E4
W33
W33
Lube groove & holes outer ring,
holes inner ring
E7
W513
W33W94
Sheading0A
B
Holes only outer ring
E3
W20
W20
SY
Holes only inner ring
E5
W26
W94
heading0AB
No relube features
BLANK
BLANK
BLANK
--
Plugs provided for outer ring holes E42
W77
W84
heading0
Combination W33, W4, W31
E4P53
W507
W33W4W31 --
Combination W33, W31
E4U22
W506
W33W31
Combination W33, W26, W31
E7U22
W509
W33W94W3
Sheading0A
1
Outer ring w/extra close running
accuracy
P52
C04
C04
T52BN
Inner ring w/extra close running
accuracy
P53
C02
C02
T52BE
Inner & outer ring w/extra close
running accuracy
P55
C08
C08
T52BW
Special inspection measures
U22
W31
W31
--
Inner ring & outer ring heat
stabilized to 200C
S11
S1
--
--
Tight clearance
C2
C2
C2
C2
Normal clearance
BLANK
BLANK
BLANK
BLANK
Loose clearance
C3
C3
C3
C3
Extra loose clearance
C4
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.
Interchange - Inch Tapered Roller Bearings
NSK SKF
Timke
FAG
n
Extra heavy
EH
EH
EH
KEH
Heavier than heavy
HH
HH
HH
KHH
Heavy
KH
Heavy medium
HM
HM
HM
KHM
KM
Light medium
LM
LM
LM
KLM
Light
KL
Lighter than light
LL
LL
LL
KLL
Extra light
EL
EL
EL
KEL
Description
Prefix Medium
Description
Cup
Angle
NSK SKF
Timke
FAG
n
0 to 2359'59.99
1xxx 1xxx
1xxxx
x
x
1xxx
x
24 to 2529'59.99
2xxx 2xxx
2xxxx
x
x
2xxx
x
2530' to 2659'59.99
3xxx 3xxx
3xxxx
x
x
3xxx
x
27 to 2829'59.99
4xxx 4xxx
4xxxx
x
x
4xxx
x
2830' to 3029'59.99
5xxx 5xxx
5xxxx
x
x
5xxx
x
3030' to 3229'59.99
6xxx 6xxx
6xxxx
x
x
6xxx
x
3230' to 3559'59.99
7xxx 7xxx
7xxxx
x
x
7xxx
x
36 to 4459'59.99
8xxx 8xxx
8xxxx
x
x
8xxx
x
45 up, but not thrust only conforms to AFBMA
standard case carburized cup & cone
9xxx 9xxx
9xxxx
x
x
9xxx
x
R
G
Interchange - Metric Tapered Roller Bearings
Description
P/N
NSK
SKF
Timken
FAG
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
Description
Suffix
NSK
SKF
Timken
FAG
Medium, extra wide
HR332xx
332xx
332xx
332xx
Medium contact angle
Steep contact angle
--
--
--
Modified internal design
Conforms to ISO 355
--
--
Thrust bearing cross-references
Updated: Prior to 2007 Dec 11
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Glossary
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.
Interchange - Ball Thrust Bearings
Description
P/N
NSK
SKF
FAG
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
Steel cage
BLANK
FP
Brass cage
MP
--
With self-aligning seat washer
ABEC 5 precision class
P5
P5
P5
Suffix Boundary dimensions adopted to ISO
Interchange - Spherical Thrust Bearings
Description
P/N
NSK
SKF
FAG
Torrington
Light
292xx
292xx
292xx
292xx
Medium
293xx
293xx
293xx
293xx
Description
Suffix
NSK
SKF
FAG
Torrington
Heavy
294xx
294xx
294xx
294xx
Steel Cage
EJ
EJ
Brass Cage
EMB
EM
Mounted bearing unit cross-references
Updated: Prior to 2007 Dec 11
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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.
Interchange - Mounted Bearing Units
Description
Insert
NSK
SKF
Seal
Master
Torr/FAF
Bearing, tapered bore w/adaptor,
relube
UK
--
--
Bearing, set screw, wide ir, relube
UC
YAR2
GCxxxxKRR
2-xx
B
Bearing, set screw, narrow ir, nonrelube
UB
--
--
Bearing, ecc locking collar, narrow ir,
EN
non-relube
YET2
GRAxxxxRR
VxxE
B
Bearing, ecc locking collar, wide ir,
relube
EW
YEL2
GxxxxKRRB R-xxE
UCPA
--
--
TB
UCP
SYxxTM
RASC
NP
Block, eccentric locking collar,
narrow ir
ENP
SYxxFM
VAS
VPxxE
Block, eccentric locking collar
EWP
--
RAS
RPxxE
Block, low base with set screw
UCPLL --
YAK
NPL
Prefi Block, tapped-base with set screw
x Block, with set screw
Block, low base w/ecc locking collar,
ENLPL SYHxxFM VAK
narrow ir
--
VPLxxE
Block, low base w/ecc locking collar EWPLL
SYHxxW
M
RAK
RPL
Flange, square, with set screw
UCF
FYxxTM
RCJC
SF
Flange, square, with set screw
UCFX
FYMxxTM --
MSF
FYxxFM
VCJ
VFxxE
RCJ
RFxxE
Flange, square, w/ecc locking collar,
ENF
narrow ir
Flange, square, w/ecc locking collar
EWFH FYxxWM
Flange, oval, with set screw
UCFL
FYTxxTM RCJTC
SFT
Flange, oval, w/ecc locking collar,
narrow ir
ENFL
FYTxxFM VCJT
VFTxxE
Description
P/N
Suffix
SKF
Seal
Master
Torr/FAF
Flange, oval, w/ecc locking collar
EWFL
H
FYTxxWM RCJT
--
Flange, oval, w/ecc locking collar
EWFL
--
--
RFTxxE
Flange, pressed steel, oval w/set
screw
UBPFL --
--
SSFT
Flange, pressed steel, oval w/ecc
locking collar
ENPFL FTPxxFM
RAT
SSFTxxE
Flange, round, cartridge w/set screw
UCFC
--
--
SFC
Flange, round, cartridge w/ecc
locking collar
EWFC
--
--
SFCxxE
Flange, offset, 3 bolt w/set screw
UCFK
--
--
RB
Take-up type
TB
RTU
RT
Pressed steel cover
*Y
--
AVAIL
Cast iron cover
--
--
--
Standard series, metric
2XX
XX
XX
S-2xx
Medium series, metric
3XX
--
--
--
Medium series, metric
Xxx
Mxx
--
53xx
Standard series, inch (see shaft size
chart)
2xx-xxS x-x/x
x-x/x
-xx
Medium series, inch (see shaft size
chart)
3xx-xxS x-x/x
x-x/x
-xx
Spherical housing bore tolerance
class J7
Inch size set screw in locking device U
Improved set screw design
*Prefix
NSK
Bearing Data
Bearing codes need not be a puzzle
Here we will try & explain some of the bearing data that could help you have a better
understanding of what at first might just look like a bunch of numbers,
We will start with the most common asked questions,
Bearing Suffixes:
Suffixes are used to identify designs or variants which differ in some way from the original
design, or which differ from the current standard design, each bearing manufacture have there
own suffix & this is where it becomes a little confusing,
The most commonly used suffixes are listed below,
Suffix RS, LU, DU, RSR, E
Bearing with one rubber seal
Example 6205 LU
Suffix 2RS, 2RSH, 2RS1, LLU, DDU, 2RSR, EE
bearing with two rubber seals
Example 6205 LLU
Suffix Z, ZR
bearing with one metal shield
Example 6205 ZR
Suffix 2Z, 2ZR, ZZ
bearing with two metal shields
Example 6205 2Z
Suffix NR
bearing with snap ring groove & snap ring
Example 6205 NR
Suffix RSNR
bearing with one rubber seal & snap ring groove with snap ring
Example 6205 RSNR
Suffix 2RSNR, 2RS1NR, 2RSHNR, 2RSRNR, LLUNR, DDUNR, EENR
bearing with two rubber seals & snap ring groove with snap ring
Example 6205 2RS1NR
Suffix 2ZNR, ZZNR, 2ZRNR
bearing with two metal shields & snap ring groove with snap ring
Example 6205 2ZNR
Suffix ZNR
bearing with one metal shield & snap ring groove with snap ring
Example 6205 ZNR
Suffix M, MA, MB, ML, MP, BR
bearing with brass cage
Example 6318 MA
Suffix ETN9, TNH, TN, ETVP2, TN9, ETVP, TVP, ECP, E.G15, ET, ETN, ET2X
bearing with polymide plastic cage
Example N205 ETN9
Suffix C2, F3
bearing with internal clearance smaller than normal
Example 6205 C2
Suffix C3, J30, F4
bearing with internal clearance greater than normal
Example 6205 C3
Suffix C4
bearing with internal clearance greater than C3
Example 6205 C4
Suffix C5
bearing with internal clearance greater than C4
Example 6205 C5
Suffix GJN
bearing with high temp grease -30 to +150 C
Example 6205 GJN
Suffix HT
bearing with high temp grease -40 to +150 C
Example 6205 HT
Suffix WT
bearing with high temp grease -40 to +160 C
Example 6205 WT
Suffix VL0241
bearing with aluminium oxide coated outside surface of the outer ring for electrical resistance up
to 1000 V DC
Example 6317 MC3VL0241
Suffix VL2071
bearing with aluminium oxide coated outside surface of the inner ring for electrical resistance up
to 1000 V DC
Example 6324 C3VL2071
