KOYO Bearing 3321

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Specifications of KOYO Bearing 3321

KOYO Bearing 3321

(Boundary dimensions …etc)

105 mm
225 mm
87.3 mm
3 mm
Basic load ratings : Cr
331 kN
Basic load ratings : C0r
354 kN
Fatigue load limit : Cu
18.5 kN
Limiting speeds(Grease lub.)
1800 min-1
Limiting speeds(Oil lub.)
2300 min-1
Load center spread : a
148.1 mm

Mounting dimensions

119 mm
– mm
211 mm
2.5 mm


15.6 kg

Product description of KOYO Bearing 3321

KOYO Bearing 3321, Double-row Angular contact ball bearings-Open. Due to having contact angles, the angular contact ball bearing is suitable for applications demanding high accuracy and high rotational speed and is capable of withstanding combined radial and axial loads. And you may also like related type KOYO Bearing 3322.

Angular contact ball bearings are suitable for applications which require high accuracy and good high-speed Performance. This type of bearing is designed to carry a combined load.

■Single-row angular contact ball bearings and matched pair angular Contact angle contact ball bearings ●The standard contact angles are 15*, 30° and 40*. They are identified, respectively. By the supplementary codes ^C',"A" (omitted) and "B". Bearings with a smaller contact angle are more suitable for applications involving high-speed rotation.Those with a larger contact angle feature superior axial load resistance.

●Angular contact ball bearings are gotten preload-ed to enhance their rigidity and rotating performance.(refer to p. A 106.) For high-precision matched pair angular contact ball bear-rings or class 5 or higher, which are used in machine tools and other precision equipment, the standard preload is Specif-led in three levels: slight (S). light (L). medium (M)and heavy (H)(refer to Table 11-2 on p. A 108.) ●When this type of bearing is loaded radially, an axial component of force is produced. In this case, two bearings are used together facing one another, or two or more bearings are matched and used. (refer to p. A 34.)

●Tables 1 and 2 list the different types of single-row and matched pair/slack angular contact ball bearings and describe their characteristics.

■Double-row angular contact ball bearings, KOYO Bearing 3321, Double-row Angular contact ball bearings-Open.
Consist of two single-row angular contact ball bearings matched back-to-back, with inner and outer rings integrated. Table 3 shows major types and their characteristics.
■Four-point contact ball bearings
●Have a contact angle of 35° and an inner ring Divided into two annular pieces. They are suitable for applications that involve either axial loading or combined load . where the axial load makes up the major part of the load,
●Able to support both axial load and a certain degree of redial load. Each rolling element is in contact with each of the inner and outer rings at a single point, and both contact points lie on the contact angle line. The line runs to either the right or left depending on the direction of the axial lad.
●Accommodates radial load and axial load in both directions. Also able to accommodate moment load When initializing bearings withing slot (32 and 33 serie8), the face way side without fling slot must accommodate main load.
●The 32 and 33 series are provided with a cling slot while he 52 and 53 series are not32 and 33 series : contact angle 32°and 53 series : contact angle 24°
●Interior to single-row pair angular contact ball bearings in terms of high-speed and high accuracy perform-mace.
●Shielded or sealed 52 and 53 series bearings are also available

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