5311 Series

Double-Row Angular Contact Ball Bearings

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Grouped product items
Parts Number
5311 Double-Row Angular Contact Ball Bearings			Add to Compare You can use this service by registering as a member.
5311C3 Double-Row Angular Contact Ball Bearings			Add to Compare You can use this service by registering as a member.
5311C2 Double-Row Angular Contact Ball Bearings			Add to Compare You can use this service by registering as a member.
5311C4 Double-Row Angular Contact Ball Bearings			Add to Compare You can use this service by registering as a member.

Product Information

Display units Metric Imperial

Designations

5311

Boundary Dimensions

d	55	mm	Bore diameter
D	120	mm	Outside diameter
B	49.2	mm	Width
r (min.)	2	mm	Chamfer dimension

Basic Load Ratings

C_r	105000	N	Basic dynamic load rating
C_0r	73000	N	Basic static load rating

Speeds

Grease	3800	min^-1	Grease lubrication
Oil (Oil-bath)	5000	min^-1	Oil-bath lubrication

Dimensions

60.6

Load center spacings

Abutment and Fillet Dimensions

da (min.)	65	mm	Diameter of shaft abutment
Da (max.)	110	mm	Diameter of housing abutment
ra (max.)	2	mm	Radius of shaft or housing fillet

Mass

(approx.)

2.3

Drawing for Reference

Designations	Boundary Dimensions			Basic Load Ratings		Tolerance Class	Limiting Speeds		Mass
Designations	d (mm)	D (mm)	B (mm)	C_r (N)	C_0r (N)	Tolerance Class	Grease (min^-1)	Oil (Oil-bath) (min^-1)	(kg)
5311	55	120	49.2	105000	73000		3800	5000	2.3

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Not to scale.
(*) The chamfer dimensions are minimum values.

CAD

FAQs (3)

Customer Questions

How can I distinguish angular contact ball bearings (ACBBs) from deep groove ball bearings (DGBBs)?

The thickness of the outer ring is different for the marked and unmarked sides of angular contact ball bearings. This is due to the contact angle between the outer ring and balls. Conversely, the thickness of the outer ring in deep groove ball bearings is equal on both sides.
Additionally, ACBBs have 7xxx designations, while DGBBs have 6xxx designations.

What are the differences when using an angular contact ball bearing arrangement, a double-row angular contact ball bearing, or two individual single-row angular contact ball bearings?

Double-row ACBBs can take axial loads in both directions, but they have limited contact angle options.
ACBB arrangements or multiple single-row ACBBs can only take axial load in one direction based on how they are combined. However, multiple-bearing options have no limits for contact angle, allowing for a custom selection to best match the ratio of radial load to axial load.
Additionally, the clearance and precision of ACBB arrangements is controlled as a set, creating a stable level of vibration/noise and rotational accuracy. However, using two single-row ACBBs that are controlled individually can cause significant variation in their resulting properties when combined.

What makes angular contact ball bearings unique?

As their name implies, the balls and outer ring in an ACBB make contact diagonally at the specifed contact angle. The contact angle affects the inclined contact made between the balls and outer ring, thereby affecting limiting speed and load capacity. The larger the contact angle, the higher the bearing's axial load capacity.

More Information

More Information
NSK Product Type2	ACBB_DR
NSK Product Type	Bearing
Designations	5311