SKF 3311 DMA Angular Contact Ball Bearing 55 × 120 × 49.2 mm

Double row angular contact ball bearing with two-piece inner ring

Angular Contact Ball Bearing

RFQ

Estimated delivery: 10 Jul 2026 (overseas stock, ~4 weeks)

In stockEstimated delivery: 10 Jul 2026 (overseas stock, ~4 weeks)

EX-WORKS (Incoterms 2020) Seoul, Korea — Buyer arranges freight, duties, and insurance.

Category: Angular Contact Ball Bearing
Dimensions: 55x120x49.2mm

Overview

Double row angular contact ball bearing with two-piece inner ring

Double row angular contact ball bearings, with two-piece inner ring, correspond to a pair of single row angular contact ball bearings in a back-to-back arrangement, while requiring less axial space than the equivalent pair of single row angular contact ball bearings. The two-piece inner ring enables incorporation of a larger number of balls, with a larger contact angle, providing a high load carrying capacity, especially in the axial direction.

Key features

Accommodate very high axial loads in both directions, radial loads, and tilting moments
Suitable where a stiff bearing arrangement is required
Separable design means outer ring with ball and cage assemblies can be mounted independently of the inner ring halves

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
C	111 kN	Basic dynamic load rating
C0	100 kN	Basic static load rating
reference_speed_rpm	6 000 r/min	Reference speed
limiting_speed_rpm	5 000 r/min	Limiting speed

Symbol	Value	Description
d	55 mm	Bore diameter
D	120 mm	Outside diameter
B	49.2 mm	Width
α	45 °	Contact angle

Symbol	Value	Description
da	min. 66 mm	da
Da	max. 109 mm	Da
ra	max. 2 mm	ra

Accommodates very high axial loads, radial loads and tilting moments in both directions
Suitable where a strong bearing arrangement is required
Separable design allows mounting the outer ring with ball-and-cage assembly independently of the inner ring halves

Code	Description
접촉 유형	Normal contact (four-point contact)
열 개수	2
로케이팅 기능, 베어링 외륜	None
링 유형	Two-piece inner ring and one-piece outer ring
케이지	Machined brass
접촉각 배열(복열 베어링)	Back-to-back (O)
일치된 배열	No
유니버설 매칭 베어링	No
축방향 내부틈새	CN
소재, 베어링	Bearing steel
코팅	None
씰링	None
윤활유	None
재윤활 기능	None
제품 순 중량	2.8 kg
eClass 코드	23-05-08-03
UNSPSC 코드	31171531

datasheet pdf download

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