Prefix Brand Product line Characteristics Description
10X SNR Spherical roller bearings Dimension Non-ISO dimensions
2- NTN Ball bearings Component Concerns inner ring & outer ring only
2LA NTN High precision angular contact ball bearings Material Special material with improved surface treatment
2TS2- NTN Tapered roller bearings Material Heat treatment for operation up to 160°C, for the cone and the cup
4T- NTN Tapered roller bearings Material Case hardened steel, a2 = 1.4 & interchangeability
5- NTN Ball bearings Component Concerns balls only
5S NTN High precision angular contact ball bearings Component Hybrid bearing, steel rings and ceramic balls
7E- NTN Needle roller bearings Material Case hardened outer ring
7MC3- NTN Ball bearings Others Ceramic coated outer ring
7MP- NTN Ball bearings Others Plastic molded outer ring
8E- NTN Needle roller bearings Component Case hardened rings (if massive rings) or cage (if needle and cage assembly)
8Q- NTN Needle roller bearings Component Nitrided cage
A- NTN Bearing units Assembly Bearing insert outer ring: opposite mounting to inner ring
AC- NTN Ball bearings Others Anti-creeping bearing
AH NTN Bearing units Others Bearing insert with hexagon bore. AH is basic number. e.g. 1AH03-9/16
AS NTN Bearing units Others Bearing insert with square bore. AS is basic number. e.g. 1AS08-7/8
B- NTN Bearing units Assembly Bearing insert: 180° mounting to housing
BNS NTN High precision angular contact ball bearings Others High precision angular contact bearings for high speeds, double sided non-contact seal
C SNR Bearing units Dimension Bearing insert with cylindrical outer ring matching JIS norm
C- NTN Bearing units Component Bearing unit with cast iron cover (open version)
CH SNR Tapered roller bearings Component Ceramic rolling elements
CH SNR High precision angular contact ball bearings Component Hybrid bearing, steel rings and ceramic balls
CM- NTN Bearing units Component Bearing unit with cast iron cover (closed version)
D- SNR Bearing units Material Ductile housing with standard dimensions (design optimized)
E- NTN Tapered roller bearings Material Bearing with carburized rings and rollers
EA- NTN Tapered roller bearings Material E- case hardened steel + carbonitriding
EC- NTN Ball bearings Others Expansion adjustment bearing for general purpose
EC1- NTN Ball bearings Others Expansion adjustment bearing for high temperature (maxi 150°C)
EC2- NTN Ball bearings Others Expansion adjustment bearing for ultra high temperature (maxi 180°C)
ECO- NTN Tapered roller bearings Material ECO Top bearing (ETA- steel + optimized internal design) & interchangeability
EH NTN Tapered roller bearings Dimension Extra heavy series
EL NTN Tapered roller bearings Dimension Extra light series
ET- NTN Tapered roller bearings Material High quality case hardened steel a2 = 1.9 & interchangeability
ETA- NTN Tapered roller bearings Material High quality case hardened steel with carbonitriding, a2=2.8 & interchangeability
F- NTN Ball bearings Material Stainless steel ball bearing
FXX SNR Tapered roller bearings Dimension Modified width for outer ring
H NTN Tapered roller bearings Dimension Heavy series
HH NTN Tapered roller bearings Dimension Heavier than heavy series
HL- NTN Tapered roller bearings Dimension HL treatment on the rollers
HL- NTN Needle roller bearings Material Special needles for better lubrication
HM NTN Tapered roller bearings Dimension Heavy medium series
HSE NTN High precision angular contact ball bearings Others High precision angular contact bearings for high speeds
HSF NTN High precision angular contact ball bearings Others High precision angular contact bearings for super high speed
J NTN Tapered roller bearings Dimension J-Line metric series Belong to ABMA norm. Can be associated with all other ABMA prefix (EL,EH,H,HH,HM,M,LM,L,LL)
L NTN Tapered roller bearings Dimension Light series
LL NTN Tapered roller bearings Dimension Lighter than light series
LM NTN Tapered roller bearings Dimension Light Medium series
M NTN Tapered roller bearings Dimension Medium series
M- NTN Bearing units Material Bearing insert inner ring: black oxide coating
ML SNR High precision angular contact ball bearings Others High precision angular contact bearings for high speeds
MLCH SNR High precision angular contact ball bearings Others High precision angular contact bearings with ceramic balls for high speeds
MLE SNR High precision angular contact ball bearings Others High precision angular contact bearings for high speeds, double sided non-contact seal
MLECH SNR High precision angular contact ball bearings Others High precision angular contact bearings with ceramic balls for high speeds, double sided non-contact seal
R- NTN Ball bearings Dimension Inch dimensions
S SNR Ball bearings Material Stainless steel ball bearing
S SNR Bearing units Material Stainless steel type
S- NTN Ball bearings Material Ceramic material
S- NTN Bearing units Component Bearing unit with steel cover (open version)
SM- NTN Bearing units Component Bearing unit with steel cover (closed version)
T7FC NTN Tapered roller bearings Others Steeper angle
TA- / TAB- NTN Ball bearings Material Made of nitride treated bearing steel
TM- / TMB- NTN Ball bearings Material Made of bearing steel with special thermal treatment
TS2- NTN Tapered roller bearings Material Heat treatment for operation up to 160°C, for all bearing elements
TS2- NTN Ball bearings Material Special thermal treatment up to 160°C
TS3- NTN Ball bearings Material Special thermal treatment up to 200°C
TS4- NTN Ball bearings Material Special thermal treatment up to 250°C
U-RSH NTN Ball bearings Others Sensor bearing
W- NTN Ball bearings Dimension Modified width
WA NTN Spherical roller bearings Dimension Non-ISO dimensions
X SNR Bearing units Others Bearing insert without shaft fixation
Z SNR Bearing units Others Bearing insert for food processing industry
Suffix Brand Product line Characteristics Description
/2AS NTN Needle roller bearings Component Grease Shell Alvania 2
/3AS NTN Needle roller bearings Component Grease Shell Alvania 3
/5K NTN Needle roller bearings Component Grease Multemp SRL
/8A NTN Needle roller bearings Component Grease Alvania EP2
/GH NTN Ball bearings Design Heavy preload
/GL NTN Ball bearings Design Light preload
/GM NTN Ball bearings Design Medium preload
/GN NTN Ball bearings Design Standard preload
/L588 NTN Needle roller bearings Component Pyronoc Universal N6C
/LP03 NTN Needle roller bearings Component Solid Lubrication
2AS NTN Ball bearings Component Standard grease for sealed and shielded bearings (-25°C up to +120°C)
2RS SNR Ball bearings Component Contact seal on both sides - Only for stainless steel deep groove ball bearings
5K NTN Ball bearings Component Universal grease for sealed and shielded bearings (-40°C up to +150°C)
A NTN Tapered roller bearings Design Internal design change (for inch items only)
A SNR Tapered roller bearings Dimension Conform to ISO and optimized capacity
A SNR Ball bearings Component 1 row angular contact ball bearings: Polyamide cage
A SNR Ball bearings Design Double row angular contact ball bearings : PA66 + flass fiber cage ; 25° contact angle ; no filling slot
Double row deep groove ball bearings: PA66 + flass fiber cage ; no filling slot
A SNR Ball bearings Design Double row angular contact ball bearings : PA66 + flass fiber cage ; 25° contact angle ; no filling slot
Double row deep groove ball bearings: PA66 + flass fiber cage ; no filling slot
A NTN Ball bearings Component Seal made of Polyacryl material
A, B, C NTN Needle roller bearings Design Internal design modified
A1 NTN Ball bearings Component Seal made of Fluorine material
A10 SNR Bearing units Design Standard housing without grease bore
A2 NTN Ball bearings Component Seal made of Silicon material
AD NTN High precision angular contact ball bearings Design Contact angle 25°
AGR SNR Bearing units Component Bearing insert with high performance seal for agriculture machines
B NTN Tapered roller bearings Design Internal modification (for inch items only)
B NTN Spherical roller bearings Design Non Ultage internal design, asymmetrical rollers
B SNR Tapered roller bearings Design Steeper angle serie
B SNR Ball bearings Design One row angular contact ball bearings : 40° contact angle
Double row angular contact ball bearings : Steel cage ; 32° contact angle ; with filling slot
B SNR Ball bearings Design One row angular contact ball bearings : 40° contact angle
Double row angular contact ball bearings : Steel cage ; 32° contact angle ; with filling slot
B NTN Ball bearings Design 40° contact angle
BG SNR Ball bearings Design 40° contact angle, universal design
BG NTN Ball bearings Design 40° contact angle, universal design
Bn SNR Bearing units Others Non-standard bearing insert with various features
C NTN Tapered roller bearings Design Steeper angle for 323xx serie (for metric items only)
C SNR Tapered roller bearings Dimension Conform to ISO
C NTN High precision angular contact ball bearings Design Contact angle 15°
C SNR High precision angular contact ball bearings Design Contact angle 15°
C NTN Needle roller bearings Design Special thread for European interchangeability (cam followers)
-C NTN Bearing units Design ntn-bearing_units-design--c-description to translate
C2 NTN & SNR Spherical roller bearings Design Internal radial clearance smaller than standard Cn clearance
C2 SNR Ball bearings Design Radial internal clearance, C2 class
C2 NTN Cylindrical roller bearings Design Radial internal clearance, C2 class
C2 NTN Bearing units Design Clearance < Normal
C2 NTN Ball bearings Design Radial internal clearance, C2 class
C3 NTN & SNR Spherical roller bearings Design Internal radial clearance higher than standard Cn clearance
C3 SNR Ball bearings Design Radial internal clearance, C3 class
C3 NTN Cylindrical roller bearings Design Radial internal clearance, C3 class
C3 NTN Bearing units Design Clearance > Normal
C3 NTN Ball bearings Design Radial internal clearance, C3 class
C4 NTN & SNR Spherical roller bearings Design Internal radial clearance higher than C3
C4 SNR Ball bearings Design Radial internal clearance, C4 class
C4 NTN Cylindrical roller bearings Design Radial internal clearance, C4 class
C4 NTN Bearing units Design Clearance > C3 ("C4" is standard for "HT2" type so not shown)
C4 NTN Ball bearings Design Radial internal clearance, C4 class
C5 NTN & SNR Spherical roller bearings Design Internal radial clearance higher than C4
C5 SNR Ball bearings Design Radial internal clearance, C5 class
C5 NTN Cylindrical roller bearings Design Radial internal clearance, C5 class
C5 NTN Bearing units Design Clearance > C4
C5 NTN Ball bearings Design Radial internal clearance, C5 class
CC SNR Bearing units Component Bearing unit with narrow steel cover (closed version)
CCE SNR Bearing units Component Bearing unit with wide steel cover (closed version)
CM NTN Ball bearings Design Special normal radial internal clearance with tighten tolerances
CN NTN Bearing units Design Normal (bearing unit standard clearance)
CO SNR Bearing units Component Bearing unit with narrow plate cover for metric shaft (open version)
COE SNR Bearing units Component Bearing unit with wide steel cover for metric shaft (open version)
COEU SNR Bearing units Component Bearing unit with wide steel cover for imperial shaft (open version)
COU SNR Bearing units Component Bearing unit with narrow steel cover for imperial shaft (open version)
CSnn-n NTN Ball bearings Design Special clearance
CT NTN Needle roller bearings Others Welded cage + special heat treament on outer ring to increase lifespan
CT1 NTN Bearing units Others Bearing insert for operating temperature up to -60°C
D NTN Tapered roller bearings Design Steeper angle serie (313xx = 303xxD) (for metric items only)
D NTN Needle roller bearings Design Lubrication hole
D0 NTN Needle roller bearings Design No lubrication hole (cam followers)
D1 NTN Tapered roller bearings Design Lubrication holes & groove
D1 NTN Spherical roller bearings Design Lubrication groove and lubrication holes on outer ring
D1 NTN Bearing units Component Relubricatable type
D1 NTN Needle roller bearings Design Lubrication hole + lubrication groove
D2 NTN Bearing units Component Relubricatable type with anti-rotation ball. Outer diameter with minus tolerance
D3 NTN Bearing units Component Relubricatable type with anti-rotation ball. Outer diameter with normal tolerance
DB NTN Tapered roller bearings Assembly Face to face paired bearings
DB SNR Tapered roller bearings Assembly Back to back arrangement
DB NTN & SNR High precision angular contact ball bearings Assembly O layout
DC NTN Tapered roller bearings Assembly Double cup with one hole counter-bored for lockin pin
DF NTN Tapered roller bearings Assembly Face to face arrangement
DF SNR Tapered roller bearings Assembly Face to face arrangement
DF NTN & SNR High precision angular contact ball bearings Assembly X layout
DT NTN Tapered roller bearings Assembly Tandem arrangement
DT NTN & SNR High precision angular contact ball bearings Assembly Tandem layout
DU NTN Tapered roller bearings Design D for steeper angle serie (313xx = 303xxD), U for through hardening steel (for metric items only)
DU TU QU SNR High precision angular contact ball bearings Assembly Sets of 2, 3, 4 universal bearings
Dxxx SNR Ball bearings Component Grease type if non standard
E SNR Ball bearings Component Contact seal on one side
E1 NTN Tapered roller bearings Design Cut crowning profile (for metric items only)
EA NTN & SNR Spherical roller bearings Component Ultage design, steel cage
EA NTN Cylindrical roller bearings Design Ultage design
EE SNR Spherical roller bearings Component Sealed (2 NBR seals)
EE SNR Ball bearings Component Contact seals on both sides
EE3 SNR Spherical roller bearings Component Sealed (2 FKM seals)
EE4 SNR Spherical roller bearings Component Sealed (2 HNBR seals)
EG15 SNR Spherical roller bearings Component Ultage design, glass-fiber reinforced polyamide cage
-EL NTN Bearing units Design No eccentric locking collar for eccentric locking collar type
EM NTN & SNR Spherical roller bearings Component Ultage design, massive brass cage
EMTR SNR Ball bearings Others Electric motor product range
EW NTN Tapered roller bearings Design Optimized profile for raceways
F NTN Needle roller bearings Component Special strengthened cage (Cam and Roller Followers)
F1 NTN Ball bearings Component Machined carbon steel cage
F1 NTN Needle roller bearings Component Machined steel cage
F2 NTN Ball bearings Component Machined stainless steel cage
F600 SNR Ball bearings Others TOPLINE range for very high temperature - Maximum 350°C, 50 rpm - Open bearing with surface treatment
F604 SNR Ball bearings Others TOPLINE range for very high temperature - Maximum 350°C, 50 rpm - Shielded bearing with grease
F605 SNR Ball bearings Others TOPLINE range for very high temperature - Maximum 350°C, 50 rpm - Open bearing
F800 SNR Spherical roller bearings Others Bearing with massive brass cage for vibrating applications, special C4 clearance
F801 SNR Spherical roller bearings Others Bearing with massive brass cage for vibrating applications, special C3 clearance
F802 SNR Spherical roller bearings Others Bearing with massive brass cage for vibrating applications, special CN clearance
FD SNR Bearing units Others Bearing insert for food industry
FG1 SNR Bearing units Others Bearing insert for food industry
FM NTN Needle roller bearings Material Special heat treatment on outer ring to increase lifespan
FT150 SNR Ball bearings Others TOPLINE range for high temperature - Maximum 150°C with FKM seals on both sides
FT150ZZ SNR Ball bearings Others TOPLINE range for high temperature - Maximum 150°C with shields on both sides
G NTN High precision angular contact ball bearings Assembly Universal bearing
G1 NTN Cylindrical roller bearings Component Massive brass cage
G14 SNR Ball bearings Component Polyamide 6.6 cage
G15 SNR Ball bearings Component Polyamide 6.6 cage with glass fibers
G15 SNR Cylindrical roller bearings Component Polyamide cage
G2 SNR Bearing units Component SNR 2 line regreasing system with 4 bores in the OR
GD2 GD3 GD4 NTN High precision angular contact ball bearings Assembly Sets of 2, 3, 4 universal bearings
GL GN GM GH NTN High precision angular contact ball bearings Design Preloads (Light, Normal, Medium, Heavy)
H SNR High precision angular contact ball bearings Design Contact angle 25°
H NTN Needle roller bearings Design Hexagonal socket (cam followers)
H SNR Bearing units Design UK bearing insert equipped with adapter sleeve
H7 SNR Bearing units Design Special tolerance of spherical bearing seat: H7
HT2 NTN Bearing units Others Bearing insert for operating temperature up to +180°C
HT200 SNR Ball bearings Others TOPLINE range for high temperature - Maximum 200°C with FKM seals on both sides
HT200ZZ SNR Ball bearings Others TOPLINE range for high temperature - Maximum 200°C with shields on both sides
HVZZ SNR Ball bearings Others TOPLINE range- High speed bearings with shields on both sides
I SNR Bearing units Dimension Thermoplastic housing TBL with mounting bores (imperial)
J NTN Tapered roller bearings Component Steel cage
J NTN Cylindrical roller bearings Component Pressed steel cage
J NTN Ball bearings Component Pressed steel cage
J, JW NTN Needle roller bearings Component Special stamped steel cage
J30 SNR Cylindrical roller bearings Design = C3 clearance
J40 SNR Cylindrical roller bearings Design = C4 clearance
J74, J84, J94 SNR High precision angular contact ball bearings Design Preloads (Light, Medium, Heavy) for standard range
J74S, J84S, J94S SNR High precision angular contact ball bearings Design Preloads (Light, Medium, Heavy) for high speed range
JR NTN Ball bearings Component Bearing with pressed rivet cage
JR2 NTN Ball bearings Component Cage with reinforced type of pressed steel
K NTN & SNR Spherical roller bearings Design Tapered bore, taper 1:12
K SNR Ball bearings Design Tapered bore, taper 1:12
K NTN Ball bearings Design Tapered bore (1:12)
K30 NTN & SNR Spherical roller bearings Design Tapered bore, taper 1:30
L NTN Tapered roller bearings Design Seal feature on cone
L SNR Spherical roller bearings Others Low Noise
L NTN Needle roller bearings Component One Seal
L NTN Bearing units Design Cylindrical outer ring width: matching to JIS
L1 NTN Spherical roller bearings Component Massive brass cage
L1 NTN Ball bearings Component Machined brass cage
L1 NTN Needle roller bearings Component Brass cage
L1B NTN Ball bearings Component Machined brass cage centered on balls
L3 NTN Needle roller bearings Component Aluminium cage
L3 SNR Bearing units Component Bearing insert with triple lip seal
L4 SNR Bearing units Component Bearing insert with multiple seal and reduced rotation torque
LB, LLB NTN Ball bearings Component Nitrile non-friction seal
LB, LLB NTN Bearing units Component Non-contact seal (LB: one side, LLB: both sides)
LH, LLH NTN Ball bearings Component Nitrile low torque seal
LJ, LLJ NTN Bearing units Component Triple lip seal (LJ: one side, LLJ: both sides)
LL NTN Needle roller bearings Component Two seals
LLB NTN High precision angular contact ball bearings Component Nitrile non-friction seal (-25 to +120°C)
LLS NTN Spherical roller bearings Component Sealed (2 NBR seals)
LP SNR Bearing units Design Bearing insert with anti rotation pin (opposite side of shaft fixation)
LP03 NTN Ball bearings Component Standard solid grease
LP09 NTN Ball bearings Component Food solid grease
LPE SNR Bearing units Design Bearing insert with anti rotation pin (on side of shaft fixation)
LS, LLS NTN Bearing units Component High torque triple lip seal (LS:one side, LLS:both sides)
LT SNR Ball bearings Others TOPLINE range for Low Temperature - Minimum -40°C with seals on both sides
LTZZ SNR Ball bearings Others TOPLINE range for Low Temperature - Minimum -60°C with shields on both sides
LU, LLU NTN Ball bearings Component Nitrile double lip contact seal
LU, LLU NTN Bearing units Component Contact seal (LU:one side, LLU:both sides)
M SNR Ball bearings Component Massive brass cage, centered on balls
MA SNR Ball bearings Component Massive brass cage, centered on outer ring
MB SNR Ball bearings Component Massive brass cage, centered on inner ring
Mn SNR Bearing units Design Cast housings with metric mounting thread (size) instead of through bore
N SNR Spherical roller bearings Design Groove for snap ring on outer ring
N SNR Ball bearings Design Groove on outer ring
N SNR Bearing units Design Housing designed for steel cover installation (grooves)
N NTN Bearing units Material Material SC460(JIS)
N NTN Bearing units Design Bearing insert with snap ring groove
N NTN Ball bearings Design Groove on outer ring
N1 SNR Spherical roller bearings Design Anti rotation slot on outer ring
N1 NTN Bearing units Material Material FCD450(JIS)
N2 SNR Ball bearings Design Two snap rings on outer ring
NR SNR Ball bearings Design Groove and snap ring on outer ring
NR NTN Bearing units Design Bearing insert with snap ring groove and snap ring
NR NTN Ball bearings Design Groove and snap ring on outer ring
NRS NTN Bearing units Design Bearing insert with snap ring groove and snap ring on opposite side of standard
NS NTN Bearing units Design Bearing insert with snap ring groove on opposite side of standard
NX NTN Bearing units Material Material SS400(JIS)
P* SNR Tapered roller bearings Design Precision class
P* NTN Cylindrical roller bearings Design Precision class
P2 NTN Tapered roller bearings Design Tolerance class 2
P2 SNR Tapered roller bearings Design Tolerance class 2
P2 SNR Ball bearings Design P2 precision class
P2 NTN Cylindrical roller bearings Design Tolerance class 2
P2 NTN Ball bearings Design P2 precision class
P4 NTN Tapered roller bearings Design Tolerance class 4
P4 NTN Tapered roller bearings Design Tolerance class 4
P4 NTN Ball bearings Design P4 precision class
P4 NTN High precision angular contact ball bearings Design Precision class JIS 4/ ISO 4
P4 NTN Cylindrical roller bearings Design Tolerance class 4
P4 SNR Ball bearings Design P4 precision class
P42 NTN High precision angular contact ball bearings Design Precision class JIS 4 for the dimensions and JIS 2 for the run out in rotation
P5 NTN Tapered roller bearings Design Tolerance class 5
P5 SNR Tapered roller bearings Design Tolerance class 5
P5 SNR Ball bearings Design P5 precision class
P5 NTN Cylindrical roller bearings Design Tolerance class 5
P5 NTN Ball bearings Design P5 precision class
P6 NTN Tapered roller bearings Design Tolerance class 6
P6 SNR Ball bearings Design P6 precision class
P6 NTN Ball bearings Design P6 precision class
P63E NTN Ball bearings Design P6 precision class + C3 internal clearance + electric motor quality
P6X NTN Tapered roller bearings Design Tolerance class 6X
P6X SNR Tapered roller bearings Design Tolerance class 6X
P6X NTN Cylindrical roller bearings Design 6X precision tolerance class
PK NTN Tapered roller bearings Design Tolerance class K (ABMA, J series) (for inch items only)
PX1, PX2, ...PXn NTN Tapered roller bearings Design Special tolerance
QT NTN Ball bearings Component More than 50% grease filling rate
QT70 SNR Spherical roller bearings Component Bearing volume filled with 70% of grease
R NTN Tapered roller bearings Assembly Cone not be interchanged with other cup
S NTN Tapered roller bearings Dimension Outside dimensions modification (for inch items only)
S SNR Ball bearings Design Spherical outer diameter
S NTN Needle roller bearings Component Welded steel cage
-S NTN Bearing units Design Housing designed for steel cover installation (grooves)
SA NTN Tapered roller bearings Assembly Specification for quick assembly of the bearing
SGn SNR Bearing units Component Bearing insert filled with special grease
SRS SNR Bearing units Others Bearing insert for rubber damping ring use
ST NTN Tapered roller bearings Design Low torque specification
T04 SNR Bearing units Others Bearing insert for operating temp up to -40°C
T1 NTN High precision angular contact ball bearings Component Phenolic machined cage
T2 NTN High precision angular contact ball bearings Component Plastic, nylon or Teflon cage
T2 NTN Cylindrical roller bearings Component Polyamide cage PA66 + GF
T2 NTN Ball bearings Component Polyamide resin molded cage
T2 NTN Needle roller bearings Component Polyamide cage
T20 SNR Bearing units Others Bearing insert for operating temp up to +200°C
T2X NTN Cylindrical roller bearings Component Polyamide cage PA46 + GF
T2X NTN Ball bearings Component Polyamide 6.6 + Glass fiber 25%
TD NTN Tapered roller bearings Design Cone with tapered bore
U NTN Tapered roller bearings Material Through hardening steel SUJ2 & interchangeability (for metric items only)
U SNR High precision angular contact ball bearings Assembly Universal bearing
U NTN Ball bearings Component Open bearing with existing groove to put seal afterwards
U NTN Bearing units Component Non-contact shield ("U" is standard for "HT2" and "CT1" types so not shown)
U1 NTN Bearing units Component Non-contact seal
U2 NTN Bearing units Component Non-contact stainless shield
UA NTN Spherical roller bearings Component Ultage design, massive brass cage centered on outer ring for vibrating applications
UP NTN High precision angular contact ball bearings Design Ultra precision
UTG NTN Tapered roller bearings Design Ultage design
V1, V2, ...Vn NTN Tapered roller bearings Design Particular specification
W SNR Bearing units Design Thermoplastic housing without grease bore
W, W-1 NTN Ball bearings Design Raceway with slot or knock hole or/and tapping hole
W2 NTN Bearing units Component Bearing insert with knurled cup point set screws
W3 NTN Bearing units Component Bearing insert with cup point set screws
W33 SNR Spherical roller bearings Design Lubrication groove and lubrication holes on outer ring
W34 SNR Spherical roller bearings Design Lubrication holes on outer ring (no lubrication groove)
W4 NTN Bearing units Component Bearing insert with double point set screws
W5, W55 NTN Bearing units Component Bearing insert with dog point set screws (W5: 1 piece, W55: 2 pieces)
W6, W66 NTN Bearing units Component Bearing insert with key bolt set screws (W6: 1 piece, W66: 2 pieces)
W7-n NTN Bearing units Component Bearing insert with special set screws (2 pieces)
W8 NTN Bearing units Design Bearing insert with American Standard (ANSI) unified thread system (2 pieces)
X NTN Tapered roller bearings Design Width of cone B = total width T (for metric items only)
X1, X2, …Xn NTN Tapered roller bearings Design Special corner radii (n = number)
X1, X2, Xn… NTN Ball bearings Design Chamfer modification
X1, X2, Xn… NTN Needle roller bearings Design Chamfer modification
XU NTN Tapered roller bearings Material X + Through Hardened Steel + interchangeability (for metric items only)
Y NTN Ball bearings Component Pressed brass cage
Y SNR Bearing units Material Design optimized cast housings with standard dimensions and zinc plating
Z SNR Ball bearings Component Shield on one side
Z NTN Needle roller bearings Component One shield
Z, ZZ NTN Ball bearings Component Steel shield
Z1, ZZ1 NTN Ball bearings Component Stainless steel shield
ZW NTN Needle roller bearings Component Two row cage
ZZ SNR Ball bearings Component Shields on both sides
ZZ NTN Needle roller bearings Component Shields on both sides