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At TFL Bearings, we can offer a full selection of NACHI bearing equivalents, including ball bearings, self-aligning bearings, angular contact bearings, cylindrical bearings, needle roller bearings, and spherical bearings. Our prices are competitive with the original brand, and the bearing types are interchangeable. If you are considering changing brands to reduce costs, please feel free to contact our online engineers or send us an email!

Types of NACHI Bearings

NACHI  thrust angular contact ball bearings: thrust angular contact ball bearings contact angle is generally 60 ° Commonly used thrust angular contact ball bearings are generally two-way thrust angular contact ball bearings, mainly used in precision machine tool spindle, used with double row cylindrical roller bearings, can bear two-way axial load, with high precision, good rigidity, low-temperature rise, high speed, easy to install and disassemble and other advantages.

NACHI deep groove ball bearings: in the structure of deep groove ball bearings, each ring has a cross-section of about one-third of the equatorial circumference of the ball continuous groove type raceway. Deep groove ball bearings are mainly used to bear radial load but also can bear a certain axial load. When the radial clearance of the bearing increases, with the nature of angular contact ball bearing, it can withstand two directions of alternating axial load. Compared with other types of bearings of the same size, this type of bearing friction coefficient is small, has high limit speed and high precision, and is the user selection preferred NACHI bearing type. The deep groove ball bearing structure is simple, easy to use, is the largest production batch, and has the widest range of applications of a class of NACHI bearings.

NACHI thrust tapered roller bearings: As the thrust tapered roller bearings in the rolling body for the tapered roller, in the structure of the rolling bus and gasket raceway bus are intersected in the axis of the bearing at a point that the rolling surface can form a pure rolling, limit speed higher than the thrust cylindrical roller bearings. Features: thrust tapered roller bearings can withstand one-way axial load. The type code of thrust tapered roller bearing is 90000 type.  

NACHI double row tapered roller bearings: structure of a wide range, the largest number is 35000 type, there is a double raceway outer ring and two inner rings, a spacer between the two inner rings, change the thickness of the spacer can be adjusted clearance. This bearing in radial load simultaneously can bear a two-way axial load. It can be in the NACHI bearing axial clearance range to limit the axial displacement of the shaft and shell. Structural characteristics of tapered roller bearings. Tapered roller bearings type code 30000, tapered roller bearings for the separation type bearings.

NACHI tapered roller bearings: are mainly used to bear the radial and axial combined load. Compared with angular contact ball NACHI bearings, the bearing capacity is large, and the limit speed is low. Tapered roller bearings can withstand the axial load in one direction, limiting the axial displacement of the shaft or shell in one direction.

Nachi Bearing Designator Description

Material Designator

B- Carburized steel
C- Carburized steel
D- Carburized steel
H- High-speed steel
S- Stainless steel

Suffix Description Of Nachi Bearing Designator

Contact Angle Designation:
C: Single row angular contact ball bearings Nominal contact angle 100-220 (standard 150)
A: Single row angular contact ball bearings Nominal contact angle 220-320 (standard 300)
B: Single row angular contact ball bearings Nominal contact angle 320-450 (standard 400)
D: Cylindrical roller bearings Nominal contact angle 240-320
C: Tapered roller bearings Nominal contact angle 170-240

Special Design

A: Tapered roller bearing inner ring, bearing width has changed
E: Roller bearing design change
J: Tapered roller-bearing rings are interchangeable
S26: Heat stabilized
S28: Thermally stabilized
W20: Oil hole on the outer ring
W33: Oil hole and oil groove on the outer ring
E2: Spherical roller bearings with turned cages
EX: Spherical roller bearings with high load-carrying capacity
A2X: High-speed spherical roller bearings
AEX: Spherical roller bearings with high speed and high load-carrying capacity
V: Special for vibrating machinery

Cage Code

F: Turned mild steel cage
G: Non-metallic cage
L: Turned light alloy cage
MY: Turned brass cage
V: Cage without a cage
Y: Turned non-ferrous alloy cage

Seals Or Dust Caps

ZE Z: single-sided dust cover
ZZE ZZ: Double-sided dust cap
NKE NK: Single-sided labyrinth seal
-2NKE -2NK: Double-sided labyrinth seal
NSE NSL: Single-sided contact seal
-2NSE -2NSL: Single-sided contact seal

Collar Change

K: Taper: 1/12 tapered hole
K30: Taper: 1/30 tapered hole
N: outer ring with stop groove without stop ring
NR: Stop ring on the outer ring

Duplex Installation

DB: Back-to-back installation
DF: Face-to-face mounting
DT: Tandem mounting
KB: Back-to-back installation with outer spacer
+a: Spacer (a is nominal width in mm)
UDU: Angular contact ball bearing with equal height grinding


+H: Retaining sleeve
+AH: Retracting sleeve


C1: Radial clearance C1
C2: Radial clearance C2
(CN): Normal radial clearance
C3: Radial clearance C3
C4: Radial clearance C4
C5: Radial clearance C5
C1P: Radial and clearance C1P
C2P: Radial clearance C2P
C6P: Radial clearance C6P
C9na: Cylindrical roller bearing (C9)
C1na: Cylindrical roller bearing (C1)
C2na: Cylindrical roller bearing (C2)
Cna: Cylindrical roller bearings (nominal)
C3na: Cylindrical roller bearing (C3)
C4na: Cylindrical roller bearings (C4)
C5na: cylindrical roller bearing (C5)
CM: motor bearing radial clearance (deep groove ball bearings and non-interchangeable cylindrical roller bearings)
C: motor bearing radial clearance (interchangeable cylindrical roller bearings)


(0): JIS grade 0 (ISO ordinary grade)
P6: JIS grade 6 (ISO grade 6)
P6X: JIS grade 6X
P5: JIS grade 5 (ISO grade 5)
P4: JIS Class 4 (ISO Class 4)
P2: JIS Grade 2 (ISO Grade 2)
UP: NACHI UP grade


ADC: Shell Andoc C
AV: Shell Alvania No. 2 Grease
BC325: Japan Standard Oil 325
MTSRL: Multemp SRL

Features of NACHI Bearings

NACHI can produce products to cover almost all mechanical industries, including robot systems, lathes, tools, automobiles, large equipment, etc. In the mutual contact part of the collar, rolling body and cage that constitute the bearing, metal contact is prevented from reducing friction and wear. The rolling fatigue life of the bearing is prolonged when the rolling contact surface is well-lubricated during rotation. On the contrary, low oil viscosity and poor lubricating film thickness shorten it.

Applications NACHI Bearings

NACHI bearing thrust ball bearings are widely used, NACHI bearing thrust ball bearings are mainly used in transmission devices, engineering machinery, vibrating screens, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, motors, fans, railroads and other industries.

NACHI Bearings Equivalent

In addition, considering the higher price of famous international bearing brands, if you want to find a suitable bearing replacement with guaranteed quality, choosing TFL bearings are a good choice. Over the years, TFL bearings have been recognized by domestic and international customers as a quality alternative to SKF, FAG, INA, NSK, NTN, KO, NMB, FYH, NNCHI and TIMKEN bearings.TFL bearings are committed to precision manufacturing and strict quality control processes that have proven their reliability and efficiency in a variety of industrial applications. We offer performance and durability comparable to real bearings, meeting international standards and using advanced technology and materials.

A key advantage of TFL bearings is their competitive price without sacrificing quality, making them an attractive alternative to more expensive bearings. We can offer a full range of bearings to meet the needs of different customers. We are always happy to offer advice and answer any questions. Please see our product range or contact us for more information.