NSK Angular Contact Ball Bearings ,A :Contact Angle of 30°, 7221A ,D=105

Description

NSK Angular Contact Ball Bearings ,A :Contact Angle of 30°, 7221A ,D=105

 

Bearing
Numbers
Boundary Dimensions
(mm)
Basic Load Ratings
(kN)
Limiting Speeds
(min-1)
Factor

f0
Mass
(kg)
approx.
d D B r
min.
r1
min.
Cr C0r Grease Oil
7221A 105 190 36 2.1 1.1 157 142 3000 4000 ?€ 3.84

 

 

DESIGN, TYPES, AND FEATURES

SINGLE-ROW ANGULAR CONTACT BALL BEARINGS

Single-row angular contact ball bearings have a contact angle allowing them to sustain significant axial loads in one direction together with radial loads. Because of their design, when a radial load is applied, an axial force component is produced; therefore, two or more opposed bearings must be used.
Since the rigidity of single-row angular contact ball bearings can be increased by preloading, they are often used in the main spindles of machine tools where high running accuracy is required (refer to Chapter 9 Preload on Page A192 for more information).
Usually, the cages for angular contact ball bearings with a contact angle of 30° (designation A) or 40°(designation B) are made in accordance with Table 1, but depending on the application, machined synthetic-resin cages or molded polyamide-resin cages may also be used. The basic load ratings given in the bearing tables are based on standard cages.
Though the figures in the bearing tables on Pages C086 to C101 for bearing bore diameters of 10 to 120 show bearings with single-shoulder inner rings, dual-shoulder bearings are also available. Please consult NSK for more detailed information.

 

MATCHED ANGULAR CONTACT BALL BEARINGS

The types and features of matched angular contact ball bearings are shown in Table 2.

 

Table 2  Types and Features of Matched Angular Contact Ball Bearings

Figure 

Arrangement 

Features

Back-to-Back
(DB)
(Example)
7208 A DB

   Radial loads and axial loads in both
directions can be sustained.

   Since the distance between the
effective load centers a0 is large,
this type is suitable if moments are applied.

Face-to-Face
(DF)
(Example)
7208 B DF

   Radial loads and axial loads in both
directions can be sustained.

   Compared with the DB Type, the distance
between the effective load centers is small,
so the capacity to sustain moments is inferior.

Tandem
(DT)
(Example)
7208 A DT

   Radial loads and axial loads in one
direction can be sustained.

   Since two bearings share the axial load,
this arrangement is used when the load in one direction is heavy.

 

 

?¡Formulation of Bearing Designations

Single-Row Matched Angular Contact Ball Bearings

? Bearing type

7 : Single-row angular contact ball bearings, matched angular contact ball bearings

?¡Dimension Series

2 : 02 Series, 3 : 03 Series, 9 : 19 Series, 0 : 10 Series

?¢Bore number 

Less than 03, Bearing bore 00 : 10mm, 01 : 12mm, 02 : 15mm, 03 : 17mm
Over 04, Bearing bore Bore number ×5 (mm) 

?£Contact angle

C : 15°, A5 : 25°, A : 30°, B : 40°

?¤Internal design

EA : High Load Capacity

?¥Cage

W : Pressed steel Cage, T85 : Machined brass cage (ball-guided),
No designation : Machined brass cage (inner ring guided), TYN : Polyamide resin cage,
T85 : Polyamide 46 resin cage, T7 : L-PPS resin cage

?¦Arrangement

SU: Universal arrangement (single-row), DU : Universal arrangement (double-row),
DB : Back-to-back arrangement, DF : Face-to-face arrangement, DT : Tandem arrangement

?§Preload / Axial

   internal clearance

EL : Extra light preload, L : Light preload, M : Medium preload, H : Heavy preload
Omitted : CN clearance, C3 : Clearance greater than CN, C4 : Clearance greater than C3,
CNB : CN Clearance equivalent (universal arrangement)

 

 DOUBLE-ROW ANGULAR CONTACT BALL BEARINGS

Double-row angular contact ball bearings are essentially a back- to-back mounting of two single-row angular contact ball bearings, but their inner and outer rings are each integrated into one. These bearings can sustain axial loads in both directions and offer good capacity for sustaining moment loads. They are often used as fixed- end bearings and contain cages made of pressed steel.

 

?¡Formulation of Bearing Designations

Double-Row Angular Contact Ball Bearings

 

? Bearing type

5 : Double-row angular contact ball bearings

?¡Dimension Series

2 : 02 Series   3: 03 Series

?¢Bore number 

03 and under: 00 : 10mm, 01 : 12mm, 02 : 15mm, 03 : 17mm
04 and over: Bore diameter bore number ×5 (mm)

?£Internal design

 ZZ: Steel shield on both sides, DDU: Rubber contact seal on
both sides VV: Rubber noncontact seal on both sides

?¤Seals/shields

 Z: Steel shield on one sides, DU: Rubber contact seal on one side,
V: Rubber non-contact seal on one side

?¥Grease*

NS7: NS HI-LUBE

Product form

NSK Angular Contact Ball Bearings ,A :Contact Angle of 30°, 7221A ,D=105   Bearing Numbers Boundary Dimensions (mm) Basic Load... Read more

SKU: 7221A
Barcode: 7221A

$280.22 Excl. VAT

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      Description

      NSK Angular Contact Ball Bearings ,A :Contact Angle of 30°, 7221A ,D=105

       

      Bearing
      Numbers
      Boundary Dimensions
      (mm)
      Basic Load Ratings
      (kN)
      Limiting Speeds
      (min-1)
      Factor

      f0
      Mass
      (kg)
      approx.
      d D B r
      min.
      r1
      min.
      Cr C0r Grease Oil
      7221A 105 190 36 2.1 1.1 157 142 3000 4000 ?€ 3.84

       

       

      DESIGN, TYPES, AND FEATURES

      SINGLE-ROW ANGULAR CONTACT BALL BEARINGS

      Single-row angular contact ball bearings have a contact angle allowing them to sustain significant axial loads in one direction together with radial loads. Because of their design, when a radial load is applied, an axial force component is produced; therefore, two or more opposed bearings must be used.
      Since the rigidity of single-row angular contact ball bearings can be increased by preloading, they are often used in the main spindles of machine tools where high running accuracy is required (refer to Chapter 9 Preload on Page A192 for more information).
      Usually, the cages for angular contact ball bearings with a contact angle of 30° (designation A) or 40°(designation B) are made in accordance with Table 1, but depending on the application, machined synthetic-resin cages or molded polyamide-resin cages may also be used. The basic load ratings given in the bearing tables are based on standard cages.
      Though the figures in the bearing tables on Pages C086 to C101 for bearing bore diameters of 10 to 120 show bearings with single-shoulder inner rings, dual-shoulder bearings are also available. Please consult NSK for more detailed information.

       

      MATCHED ANGULAR CONTACT BALL BEARINGS

      The types and features of matched angular contact ball bearings are shown in Table 2.

       

      Table 2  Types and Features of Matched Angular Contact Ball Bearings

      Figure 

      Arrangement 

      Features

      Back-to-Back
      (DB)
      (Example)
      7208 A DB

         Radial loads and axial loads in both
      directions can be sustained.

         Since the distance between the
      effective load centers a0 is large,
      this type is suitable if moments are applied.

      Face-to-Face
      (DF)
      (Example)
      7208 B DF

         Radial loads and axial loads in both
      directions can be sustained.

         Compared with the DB Type, the distance
      between the effective load centers is small,
      so the capacity to sustain moments is inferior.

      Tandem
      (DT)
      (Example)
      7208 A DT

         Radial loads and axial loads in one
      direction can be sustained.

         Since two bearings share the axial load,
      this arrangement is used when the load in one direction is heavy.

       

       

      ?¡Formulation of Bearing Designations

      Single-Row Matched Angular Contact Ball Bearings

      ? Bearing type

      7 : Single-row angular contact ball bearings, matched angular contact ball bearings

      ?¡Dimension Series

      2 : 02 Series, 3 : 03 Series, 9 : 19 Series, 0 : 10 Series

      ?¢Bore number 

      Less than 03, Bearing bore 00 : 10mm, 01 : 12mm, 02 : 15mm, 03 : 17mm
      Over 04, Bearing bore Bore number ×5 (mm) 

      ?£Contact angle

      C : 15°, A5 : 25°, A : 30°, B : 40°

      ?¤Internal design

      EA : High Load Capacity

      ?¥Cage

      W : Pressed steel Cage, T85 : Machined brass cage (ball-guided),
      No designation : Machined brass cage (inner ring guided), TYN : Polyamide resin cage,
      T85 : Polyamide 46 resin cage, T7 : L-PPS resin cage

      ?¦Arrangement

      SU: Universal arrangement (single-row), DU : Universal arrangement (double-row),
      DB : Back-to-back arrangement, DF : Face-to-face arrangement, DT : Tandem arrangement

      ?§Preload / Axial

         internal clearance

      EL : Extra light preload, L : Light preload, M : Medium preload, H : Heavy preload
      Omitted : CN clearance, C3 : Clearance greater than CN, C4 : Clearance greater than C3,
      CNB : CN Clearance equivalent (universal arrangement)

       

       DOUBLE-ROW ANGULAR CONTACT BALL BEARINGS

      Double-row angular contact ball bearings are essentially a back- to-back mounting of two single-row angular contact ball bearings, but their inner and outer rings are each integrated into one. These bearings can sustain axial loads in both directions and offer good capacity for sustaining moment loads. They are often used as fixed- end bearings and contain cages made of pressed steel.

       

      ?¡Formulation of Bearing Designations

      Double-Row Angular Contact Ball Bearings

       

      ? Bearing type

      5 : Double-row angular contact ball bearings

      ?¡Dimension Series

      2 : 02 Series   3: 03 Series

      ?¢Bore number 

      03 and under: 00 : 10mm, 01 : 12mm, 02 : 15mm, 03 : 17mm
      04 and over: Bore diameter bore number ×5 (mm)

      ?£Internal design

       ZZ: Steel shield on both sides, DDU: Rubber contact seal on
      both sides VV: Rubber noncontact seal on both sides

      ?¤Seals/shields

       Z: Steel shield on one sides, DU: Rubber contact seal on one side,
      V: Rubber non-contact seal on one side

      ?¥Grease*

      NS7: NS HI-LUBE

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