SKF 3306 A-2Z Angular Contact Ball Bearing 30 × 72 × 30.2 mm

Double row angular contact ball bearing with seals or shields

Angular Contact Ball Bearing

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Category: Angular Contact Ball Bearing
Dimensions: 30x72x30.2mm

Overview

Double row angular contact ball bearing with seals or shields

Double row angular contact ball bearings, with seals or shields, correspond to a pair of single row angular contact ball bearings in a back-to-back arrangement, while requiring less axial space. Depending on the sealing execution, they can operate at high speeds and are more suitable than deep groove ball bearings for supporting large axial forces in both directions.

Key features

High-speed capability
Accommodate relatively high radial loads, high axial loads in both directions and tilting moments
Suitable where a stiff bearing arrangement is required
Require less axial space than equivalent pair of single row angular contact ball bearings
Integral sealing prolongs bearing service life

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	42.5 kN	Basic dynamic load rating
C0	30 kN	Basic static load rating
reference_speed_rpm	10 000 r/min	Reference speed
limiting_speed_rpm	9 000 r/min	Limiting speed
performance_class	SKF Explorer	SKF performance class

Symbol	Value	Description
d	30 mm	Bore diameter
D	72 mm	Outside diameter
B	30.2 mm	Width
α	30 °	Contact angle

Symbol	Value	Description
da	max. 39.5 mm	da
Da	max. 65 mm	Da
ra	max. 1 mm	ra

High-speed performance
Accommodates relatively high radial loads, large axial loads in both directions and tilting moments
Suitable where a strong bearing arrangement is required
Requires less axial space than a corresponding pair of single-row angular contact ball bearings
Integrated sealing extends bearing service life

Code	Description
접촉 유형	Normal contact (four-point contact)
열 개수	2
로케이팅 기능, 베어링 외륜	None
링 유형	One-piece inner and outer ring
케이지	Sheet metal
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	Shield on both sides
씰링 유형	Non-contact
윤활유	Grease
재윤활 기능	None
제품 순 중량	0.53 kg
eClass 코드	23-05-08-03
UNSPSC 코드	31171531

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