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IBC

IBC IBC 71903.E Angular Contact Ball Bearing

IBC

IBC 71903.E Angular Contact Ball Bearing 17 × 30 × 7 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: 17 mm
Outer Ø: 30 mm
Width: 7 mm

Overview

IBC 71903.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	5250 N	Basic dynamic load rating, radial
C_0r	2900 N	Basic static load rating, radial
C_u	107 N	Fatigue limit load
n_G	45000 1/min	Limiting speed (grease)
n_O	67500 1/min	Limiting speed (oil-air)
≈m	0.02 kg	Weight
α	25 °	Contact angle

Symbol	Value	Description
d	17 mm	Bore diameter
D	30 mm	Outside diameter
B	7 mm	Width
d_pi	21.8 mm	Injection diameter (oil-air lubrication)
a	9 mm	Effective load centre
d₁	20.4 mm	Shoulder diameter, inner ring
D₁	25.8 mm	Shoulder diameter, outer ring
r_{1,2 min}	0.3 mm	Minimum chamfer dimension
r_{3,4 min}	0.1 mm	Minimum chamfer dimension, side face

Symbol	Value	Description
d_{a min}	19.8 mm	Min. shoulder diameter for mounting, inner ring
D_{a max}	27.3 mm	Max. shoulder diameter for mounting, housing
D_{b max}	28.1 mm	Max. shoulder diameter, sealed side
r_{a max}	0.3 mm	Max. fillet radius
r_{b max}	0.1 mm	Max. fillet radius, side face

Symbol	Value	Description
F_{v X}	18 N	Preload force — class X (extra light)
S_{a X}	40 N/μm	Axial stiffness — class X (extra light)
S_{r X}	75 N/μm	Radial stiffness — class X (extra light)
F_{AK X}	50 N	Unloading force — class X (extra light)
F_{v L}	35 N	Preload force — class L (light)
S_{a L}	50 N/μm	Axial stiffness — class L (light)
S_{r L}	100 N/μm	Radial stiffness — class L (light)
F_{AK L}	100 N	Unloading force — class L (light)
F_{v M}	80 N	Preload force — class M (medium)
S_{a M}	65 N/μm	Axial stiffness — class M (medium)
S_{r M}	130 N/μm	Radial stiffness — class M (medium)
F_{AK M}	220 N	Unloading force — class M (medium)
F_{v H}	160 N	Preload force — class H (high)
S_{a H}	90 N/μm	Axial stiffness — class H (high)
S_{r H}	180 N/μm	Radial stiffness — class H (high)
F_{AK H}	440 N	Unloading force — class H (high)

Code	Description
100Cr6	Rolling element material
MMR 17	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:

71903E
71903 E
71903
IBC71903E
IBC 71903 E
IBC71903 E
IBC 71903E
IBC71903

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

5250 N

Basic dynamic load rating, radial

C_0r

2900 N

Basic static load rating, radial

C_u

107 N

Fatigue limit load

n_G

45000 1/min

Limiting speed (grease)

n_O

67500 1/min

Limiting speed (oil-air)

≈m

0.02 kg

Weight

25 °

Contact angle

Symbol

Value

Description

17 mm

Bore diameter

30 mm

Outside diameter

7 mm

Width

d_pi

21.8 mm

Injection diameter (oil-air lubrication)

9 mm

Effective load centre

d₁

20.4 mm

Shoulder diameter, inner ring

D₁

25.8 mm

Shoulder diameter, outer ring

r_{1,2 min}

0.3 mm

Minimum chamfer dimension

r_{3,4 min}

0.1 mm

Minimum chamfer dimension, side face

Symbol

Value

Description

d_{a min}

19.8 mm

Min. shoulder diameter for mounting, inner ring

D_{a max}

27.3 mm

Max. shoulder diameter for mounting, housing

D_{b max}

28.1 mm

Max. shoulder diameter, sealed side

r_{a max}

0.3 mm

Max. fillet radius

r_{b max}

0.1 mm

Max. fillet radius, side face

Symbol

Value

Description

F_{v X}

18 N

Preload force — class X (extra light)

S_{a X}

40 N/μm

Axial stiffness — class X (extra light)

S_{r X}

75 N/μm

Radial stiffness — class X (extra light)

F_{AK X}

50 N

Unloading force — class X (extra light)

F_{v L}

35 N

Preload force — class L (light)

S_{a L}

50 N/μm

Axial stiffness — class L (light)

S_{r L}

100 N/μm

Radial stiffness — class L (light)

F_{AK L}

100 N

Unloading force — class L (light)

F_{v M}

80 N

Preload force — class M (medium)

S_{a M}

65 N/μm

Axial stiffness — class M (medium)

S_{r M}

130 N/μm

Radial stiffness — class M (medium)

F_{AK M}

220 N

Unloading force — class M (medium)

F_{v H}

160 N

Preload force — class H (high)

S_{a H}

90 N/μm

Axial stiffness — class H (high)

S_{r H}

180 N/μm

Radial stiffness — class H (high)

F_{AK H}

440 N

Unloading force — class H (high)

Code

Description

100Cr6

Rolling element material

MMR 17

Recommended precision locknut

Single row high precision angular contact ball bearing

Product type

IBC 71903.E Angular Contact Ball Bearing 17 × 30 × 7 mm