NTN Deep Groove Ball Bearings 6808ZZ, D=40

Description

NTN Deep Groove Ball Bearings  6808ZZ, D=40

Radial/Deep Groove Ball Bearing - Round Bore, 40 mm ID, 52 mm OD, 7 mm Width, Double Shielded, CN Internal Clearance

SPECIFICATIONS

Bore Type Round
Bore Diameter 40 mm
Outside Diameter 52 mm
Overall Width 7.000 mm, 0.2756 in
Closure Type Double Shielded
Row Type & Fill Slot Single Row Non-Fill Slot
Snap Ring Included Without Snap Ring
Internal Clearance CN
Operating Temperature Range -40 to 250 ºF
Cage Type Pressed
Dynamic Load Capacity 1270 lbf
Static Load Capacity 990 lbf
Precision Rating ISO Class 0
Seal Type None
Finish/Coating Uncoated
Bearing Material High Carbon Chrome Steel
Cage Material Steel
Inner Ring Width 7.000 mm, 0.2756 in
Outer Ring Width 0.2756 in; 7.000 mm
Maximum RPM (Grease) 12000 RPM
Fillet Radius 0.300 mm, 0.0118 in
Maximum RPM 12000 RPM
Series 68
Manufacturer UPC Number 4547359006223
Weight 0.07 lbs
Harmonization Code 8482.10.5048






1. Design features and characteristics

Deep groove ball bearings are very widely used. A deep groove is formed on the inner and outer ring of the bearing enabling the bearing to sustain radial and axial loads in either direction as well as the complex loads which result from the combination of these forces. Deep groove ball bearings are suitable for high speed applications. When two or more deep groove ball bearings are used in combination and mounted adjacent to each other a duplex set (D2) should be used. Duplex bearings (D2) utilize controlled tolerances to more evenly distribute the loading between the individual bearing rows which improves the overall performance of the assembly. In addition to unsealed and unlubricated “open” bearings, NTN provides deep groove ball bearings that are pre-lubricated with grease and enclosed by seals or shields. See section “11. Lubrication” for a list of some of the greases which can be used. Table 1 shows the construction and special characteristics of various sealed deep groove ball bearings. 

 

Types and codes N Shielded type Shielded type
Non-contact type ZZ Non-contact type LLB Contact type LLU Low torque type LLH
Construction
Metal shield plate is affixed to the outside ring; the inner ring incorporates a V-groove and labyrinth clearance. The outer ring incorporates synthetic rubber molded to a steel plate; seal edge is aligned with V-groove along inner ring surface with labyrinth clearance The outer ring incorporates synthetic rubber molded to a steel plate; seal edge contacts V-groove along inner ring surface Basic construction is the same as LLU type, but a specially designed lip on the edge of the seal prevents foreign matter penetration; low torque construction.
Torque Small Small Higher Medium
Dust proofing Good Better than ZZ-type Excellent Much better than LLB-type
Water proofing Poor Poor Very good Good
High speed capacity Same as open type Same as open type Limited by contact seals Much better than LLU-type
Allowable temp. range Depends on lubricant −25 to 120°C −25 to 110°C −25 to 120°C

Product form

NTN Deep Groove Ball Bearings  6808ZZ, D=40 Radial/Deep Groove Ball Bearing - Round Bore, 40 mm ID, 52 mm OD,... Read more

SKU: 6808ZZ

$12.83 Excl. VAT

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      Description

      NTN Deep Groove Ball Bearings  6808ZZ, D=40

      Radial/Deep Groove Ball Bearing - Round Bore, 40 mm ID, 52 mm OD, 7 mm Width, Double Shielded, CN Internal Clearance

      SPECIFICATIONS

      Bore Type Round
      Bore Diameter 40 mm
      Outside Diameter 52 mm
      Overall Width 7.000 mm, 0.2756 in
      Closure Type Double Shielded
      Row Type & Fill Slot Single Row Non-Fill Slot
      Snap Ring Included Without Snap Ring
      Internal Clearance CN
      Operating Temperature Range -40 to 250 ºF
      Cage Type Pressed
      Dynamic Load Capacity 1270 lbf
      Static Load Capacity 990 lbf
      Precision Rating ISO Class 0
      Seal Type None
      Finish/Coating Uncoated
      Bearing Material High Carbon Chrome Steel
      Cage Material Steel
      Inner Ring Width 7.000 mm, 0.2756 in
      Outer Ring Width 0.2756 in; 7.000 mm
      Maximum RPM (Grease) 12000 RPM
      Fillet Radius 0.300 mm, 0.0118 in
      Maximum RPM 12000 RPM
      Series 68
      Manufacturer UPC Number 4547359006223
      Weight 0.07 lbs
      Harmonization Code 8482.10.5048






      1. Design features and characteristics

      Deep groove ball bearings are very widely used. A deep groove is formed on the inner and outer ring of the bearing enabling the bearing to sustain radial and axial loads in either direction as well as the complex loads which result from the combination of these forces. Deep groove ball bearings are suitable for high speed applications. When two or more deep groove ball bearings are used in combination and mounted adjacent to each other a duplex set (D2) should be used. Duplex bearings (D2) utilize controlled tolerances to more evenly distribute the loading between the individual bearing rows which improves the overall performance of the assembly. In addition to unsealed and unlubricated “open” bearings, NTN provides deep groove ball bearings that are pre-lubricated with grease and enclosed by seals or shields. See section “11. Lubrication” for a list of some of the greases which can be used. Table 1 shows the construction and special characteristics of various sealed deep groove ball bearings. 

       

      Types and codes N Shielded type Shielded type
      Non-contact type ZZ Non-contact type LLB Contact type LLU Low torque type LLH
      Construction
      Metal shield plate is affixed to the outside ring; the inner ring incorporates a V-groove and labyrinth clearance. The outer ring incorporates synthetic rubber molded to a steel plate; seal edge is aligned with V-groove along inner ring surface with labyrinth clearance The outer ring incorporates synthetic rubber molded to a steel plate; seal edge contacts V-groove along inner ring surface Basic construction is the same as LLU type, but a specially designed lip on the edge of the seal prevents foreign matter penetration; low torque construction.
      Torque Small Small Higher Medium
      Dust proofing Good Better than ZZ-type Excellent Much better than LLB-type
      Water proofing Poor Poor Very good Good
      High speed capacity Same as open type Same as open type Limited by contact seals Much better than LLU-type
      Allowable temp. range Depends on lubricant −25 to 120°C −25 to 110°C −25 to 120°C

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