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IBC

IBC CB71856.E IBC CB71856.E Angular Contact Ball Bearing

IBC

IBC CB71856.E Angular Contact Ball Bearing 280 × 350 × 33 mm

Angular Contact Ball Bearing

RFQ

In stock

EX-WORKS (Incoterms 2020) Seoul, Korea — Buyer arranges freight, duties, and insurance.

Category: Angular Contact Ball Bearing
Bore: 280 mm
Outer Ø: 350 mm
Width: 33 mm

Overview

IBC CB71856.E Angular Contact Ball Bearing supports combined radial and one-direction axial load through a defined contact angle. It is a high-speed, high-precision choice for pumps, compressors, machine tools, and spindle-related positions where axial rigidity and rotational accuracy matter.

The inner and outer ring raceways are offset to create a contact angle. Single-row, double-row, or matched arrangements can be used to meet axial load direction, preload, and rigidity requirements.

Key features

Supports combined radial and one-direction axial load
High-speed and high-accuracy operation
Preload and rigidity adjustable through matched mounting
Suitable for precision rotating assemblies

Typical applications

Machine tool spindles and support shafts
Pumps and compressors
High-speed motors
Precision gearboxes and robot drives

Selection guidance

Select by contact angle, arrangement, preload, precision class, axial load direction, and operating speed.

Symbol	Value	Description
Cr	128000 N	Basic dynamic load rating, radial
C_0r	133700 N	Basic static load rating, radial
C_u	4952 N	Fatigue limit load
n_G	3500 1/min	Limiting speed (grease)
n_O	5200 1/min	Limiting speed (oil-air)
≈m	4.876 kg	Weight
α	25 °	Contact angle

Symbol	Value	Description
d	280 mm	Bore diameter
D	350 mm	Outside diameter
B	33 mm	Width
d_pi	310.8 mm	Injection diameter (oil-air lubrication)
a	100 mm	Effective load centre
d₁	305.2 mm	Shoulder diameter, inner ring
D₁	325.5 mm	Shoulder diameter, outer ring
r_{1,2 min}	1.5 mm	Minimum chamfer dimension
r_{3,4 min}	0.6 mm	Minimum chamfer dimension, side face

Symbol	Value	Description
d_{a min}	297 mm	Min. shoulder diameter for mounting, inner ring
D_{a max}	329 mm	Max. shoulder diameter for mounting, housing
D_{b max}	332 mm	Max. shoulder diameter, sealed side
r_{a max}	1.5 mm	Max. fillet radius
r_{b max}	0.6 mm	Max. fillet radius, side face

Symbol	Value	Description
F_{v X}	250 N	Preload force — class X (extra light)
S_{a X}	260 N/μm	Axial stiffness — class X (extra light)
S_{r X}	1710 N/μm	Radial stiffness — class X (extra light)
F_{AK X}	710 N	Unloading force — class X (extra light)
F_{v L}	510 N	Preload force — class L (light)
S_{a L}	360 N/μm	Axial stiffness — class L (light)
S_{r L}	2130 N/μm	Radial stiffness — class L (light)
F_{AK L}	1430 N	Unloading force — class L (light)
F_{v M}	1140 N	Preload force — class M (medium)
S_{a M}	490 N/μm	Axial stiffness — class M (medium)
S_{r M}	2460 N/μm	Radial stiffness — class M (medium)
F_{AK M}	3220 N	Unloading force — class M (medium)
F_{v H}	2270 N	Preload force — class H (high)
S_{a H}	680 N/μm	Axial stiffness — class H (high)
S_{r H}	3070 N/μm	Radial stiffness — class H (high)
F_{AK H}	6430 N	Unloading force — class H (high)

Code	Description
Si3N4 ceramic (hybrid)	Rolling element material
MBA 280	Recommended precision locknut
Single row high precision angular contact ball bearing	Product type

datasheet pdf download

Also searched as

The same part number can be written with or without separators, or in progressive prefix form. We index these common variants so your search reaches this page:

CB71856E
CB71856 E
CB71856
IBCCB71856E
IBC CB 71856 E
IBCCB 71856 E
IBCCB71856 E
IBC CB71856E
IBC CB 71856E
IBCCB71856

Overview

The inner and outer ring raceways are offset to create a contact angle. Single-row, double-row, or matched arrangements can be used to meet axial load direction, preload, and rigidity requirements.

Symbol

Value

Description

128000 N

Basic dynamic load rating, radial

C_0r

133700 N

Basic static load rating, radial

C_u

4952 N

Fatigue limit load

n_G

3500 1/min

Limiting speed (grease)

n_O

5200 1/min

Limiting speed (oil-air)

≈m

4.876 kg

Weight

25 °

Contact angle

Symbol

Value

Description

280 mm

Bore diameter

350 mm

Outside diameter

33 mm

Width

d_pi

310.8 mm

Injection diameter (oil-air lubrication)

100 mm

Effective load centre

d₁

305.2 mm

Shoulder diameter, inner ring

D₁

325.5 mm

Shoulder diameter, outer ring

r_{1,2 min}

1.5 mm

Minimum chamfer dimension

r_{3,4 min}

0.6 mm

Minimum chamfer dimension, side face

Symbol

Value

Description

d_{a min}

297 mm

Min. shoulder diameter for mounting, inner ring

D_{a max}

329 mm

Max. shoulder diameter for mounting, housing

D_{b max}

332 mm

Max. shoulder diameter, sealed side

r_{a max}

1.5 mm

Max. fillet radius

r_{b max}

0.6 mm

Max. fillet radius, side face

Symbol

Value

Description

F_{v X}

250 N

Preload force — class X (extra light)

S_{a X}

260 N/μm

Axial stiffness — class X (extra light)

S_{r X}

1710 N/μm

Radial stiffness — class X (extra light)

F_{AK X}

710 N

Unloading force — class X (extra light)

F_{v L}

510 N

Preload force — class L (light)

S_{a L}

360 N/μm

Axial stiffness — class L (light)

S_{r L}

2130 N/μm

Radial stiffness — class L (light)

F_{AK L}

1430 N

Unloading force — class L (light)

F_{v M}

1140 N

Preload force — class M (medium)

S_{a M}

490 N/μm

Axial stiffness — class M (medium)

S_{r M}

2460 N/μm

Radial stiffness — class M (medium)

F_{AK M}

3220 N

Unloading force — class M (medium)

F_{v H}

2270 N

Preload force — class H (high)

S_{a H}

680 N/μm

Axial stiffness — class H (high)

S_{r H}

3070 N/μm

Radial stiffness — class H (high)

F_{AK H}

6430 N

Unloading force — class H (high)

Code

Description

Si3N4 ceramic (hybrid)

Rolling element material

MBA 280

Recommended precision locknut

Single row high precision angular contact ball bearing

Product type

IBC CB71856.E Angular Contact Ball Bearing 280 × 350 × 33 mm