KOYO 7904C Bearing_KOYO 7904C Size and Details

KOYO 7904C bearing

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KOYO 7904C Bearing Details：

Bearing Name	7904C
New Model	7904C
Old Model	1036904 bearing
product Model	7904C
Category	Angular Contact Ball Bearings
Brand	KOYO Bearing
Inner Diameter d ( mm )	20
Outer Diameter D ( mm )	37
Thickness B ( mm )	9

KOYO 7904C Bearing Bearing Size and Drawing：

KOYO 7904C Bearing With size alternative model

Model	Inner Diameter d(mm)	Outer Diameter D(mm)	thickness B(mm)	Brand	Type
NACHI 61904-ZN Bearing	20	37	9	NACHI	Deep Groove Ball Bearings
NTN 61904-ZN Bearing	20	37	9	NTN	Deep Groove Ball Bearings
TBS 61904-2RZ Bearing	20	37	9	TBS	Deep Groove Ball Bearings
NSK 61904-2RZ Bearing	20	37	9	NSK	Deep Groove Ball Bearings
KOYO 6904 RU Bearing	20	37	9	KOYO	Deep Groove Ball Bearings
NSK 61904 Bearing	20	37	9	NSK	Deep Groove Ball Bearings
NSK 71904 AC Bearing	20	37	9	NSK	Angular Contact Ball Bearings
NACHI 61904-Z Bearing	20	37	9	NACHI	Deep Groove Ball Bearings
NACHI 61904 N Bearing	20	37	9	NACHI	Deep Groove Ball Bearings
NACHI 61904-2Z Bearing	20	37	9	NACHI	Deep Groove Ball Bearings

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What are the structural components and design advantages of angular contact ball bearings?

Angular contact ball bearings consist of an inner ring, outer ring, steel balls, and a cage. The raceways of the raceways are designed with a contact angle (typically 15°, 25°, or 40°) between the bearing rings and the steel balls. They offer advantages such as the ability to simultaneously withstand radial and unidirectional axial loads, high limiting speed, high precision, good rigidity, and the ability to withstand bidirectional axial loads when installed in pairs.

What are the advantages of angular contact ball bearings compared to other similar bearings?

Compared to deep groove ball bearings, angular contact ball bearings have a higher axial load capacity and higher rigidity, making them suitable for precision positioning applications. Compared to tapered roller bearings, they have a higher limiting speed and lower friction, making them more suitable for high-speed operation. Compared to thrust ball bearings, they can simultaneously withstand combined radial and axial loads, and when used in pairs, they maintain high rigidity under bidirectional axial loads without the need for additional radial bearings.

What are the applicable applications and typical uses of angular contact ball bearings?

These bearings are suitable for high-speed, high-rigidity mechanical applications requiring precise positioning and subjected to combined loads. Typical applications include machine tool spindles, automobile wheel hubs, centrifugal pumps, high-speed electric spindles, industrial robot joints, aero-engine spindles, and precision instrument turntables.

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