GMN 71921C/DF Bearing_GMN 71921C/DF Size and Details

GMN 71921C/DF bearing

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GMN 71921C/DF Bearing Details：

Bearing Name	71921C/DF
New Model	71921C/DF
Old Model	1336921 bearing
product Model	71921C/DF
Category	Angular Contact Ball Bearings
Brand	GMN Bearing
Inner Diameter d ( mm )	105
Outer Diameter D ( mm )	145
Thickness B ( mm )	40

GMN 71921C/DF Bearing Bearing Size and Drawing：

GMN 71921C/DF Bearing With size alternative model

Model	Inner Diameter d(mm)	Outer Diameter D(mm)	thickness B(mm)	Brand	Type
NSK NNU4921K Bearing	105	145	40	NSK	Cylindrical Roller Bearings
NTN 71921C/DF Bearing	105	145	40	NTN	Angular Contact Ball Bearings
NSK 71921C/DF Bearing	105	145	40	NSK	Angular Contact Ball Bearings
KOYO NNU 4921 K Bearing	105	145	40	KOYO	Cylindrical Roller Bearings
NSK 71921C/DT Bearing	105	145	40	NSK	Angular Contact Ball Bearings
NTN NNU4921 Bearing	105	145	40	NTN	Cylindrical Roller Bearings
MRC 71921C/DF Bearing	105	145	40	MRC	Angular Contact Ball Bearings
KOYO 7921CDF Bearing	105	145	40	KOYO	Angular Contact Ball Bearings
FAG 71921C/DT Bearing	105	145	40	FAG	Angular Contact Ball Bearings
NSK NNU 4921 Bearing	105	145	40	NSK	Cylindrical Roller 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.

Preview：MRC 71904C/DF
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