MRC QJ 321 Bearing_MRC QJ 321 Size and Details

MRC QJ 321 bearing

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MRC QJ 321 Bearing Details：

Bearing Name	QJ 321
New Model	QJ321
Old Model	176321 bearing
product Model	QJ321
Category	Angular Contact Ball Bearings
Brand	MRC Bearing
Inner Diameter d ( mm )	105
Outer Diameter D ( mm )	225
Thickness B ( mm )	49

MRC QJ 321 Bearing Bearing Size and Drawing：

MRC QJ 321 Bearing With size alternative model

Model	Inner Diameter d(mm)	Outer Diameter D(mm)	thickness B(mm)	Brand	Type
KOYO 7321AC Bearing	105	225	49	KOYO	Angular Contact Ball Bearings
FAG NJ 321 E Bearing	105	225	49	FAG	Cylindrical Roller Bearings
NSK 6321-Z Bearing	105	225	49	NSK	Deep Groove Ball Bearings
NTN 7321B Bearing	105	225	49	NTN	Angular Contact Ball Bearings
NACHI 1321 K Bearing	105	225	49	NACHI	Self-aligning Ball Bearings
TBS 7321BECBP* Bearing	105	225	49	TBS	Angular Contact Ball Bearings
NTN 6321-2RS Bearing	105	225	49	NTN	Deep Groove Ball Bearings
FLT NJ321 Bearing	105	225	49	FLT	Cylindrical Roller Bearings
TBS NUP 321 E Bearing	105	225	49	TBS	Cylindrical Roller Bearings
RHP NUP 321 Bearing	105	225	49	RHP	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 QJ 210
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