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Solid Type Needle Roller Bearing (NK21/20R)

Solid Type Needle Roller Bearing NK21/20R
  • On Sale Till 31/03/2025

NTN

NTN

A solid needle roller bearing.
[Features]
·The solid (machined) outer race enables high rigidity.
·The bearing accuracy can also be increased, making it ideal for applications that require high speed, high load, and high rotational accuracy.
·In addition to the type with inner race, the type without inner race is also available in which the shaft can be used directly as a raceway instead of inner race.
[Application]
・ Heavy load, high speed, gearbox for automobiles, etc.
・ Steel equipment, mining / construction machinery, machine tools.

(i)Caution

  • The product images are representative only. Specifications may differ for each part number, including shape and color.
  • Only a part of the lineup is available at MISUMI. Please use the filtering criteria to confirm the details.
  • Product supply for some items in this series are unstable and may experience either longer delivery time or sales suspension

PDF

Japanese Only

Product Specifications

TypeCompatible shaft diameter (mm) Note
RNA49 type⌀7 to ⌀12Since the suffix T2 uses a polyamide resin molding retainer, the allowable temperature should be 120°C, and 100°C or less for continuous use.
The dimension series is in accordance with JIS B 1512 or ISO 15.
RNA49··R type
RNA49··L type
RNA49··LL type		RNA49··R type
⌀14 to ⌀490
With seal
RNA49··L type
RNA49··LL type
⌀14 to ⌀58		The seal type (suffix code: L or LL) that has a built-in synthetic rubber seal on one or both sides is filled with lithium soap-based grease.
For the seal type, the operating temperature should be -20 to 120°C, or below 100°C for continuous run, in order to prevent deterioration of the seal and grease.
The dimension series is in accordance with JIS B 1512 or ISO 15.
RNA59 type ⌀20 to ⌀160The dimension series is in accordance with JIS B 1512 or ISO 15.
NA59 type⌀15 to ⌀140
NK type
NKS type		NK
⌀5 to ⌀12 		The suffix code T2 indicates that a polyamide resin molded retainer is used and the allowable temperature is 120°C.
For continuous run, maintain 100°C or below.
NKS
⌀8 to ⌀40
NKS type⌀43 to ⌀110

Product features details

The solid needle roller bearing is ideal for applications that require high speed, high load, and high rotational accuracy.

Solid needle roller bearing, detailed product features

RNA49 type

Solid needle roller bearing, detailed product features

RNA49··R type
RNA49··L type
RNA49··LL type

Solid needle roller bearing, detailed product features

RNA59 type

Solid needle roller bearing, detailed product features

NA59 type

Solid needle roller bearing, detailed product features

NK type
NKS type

Solid needle roller bearing, detailed product features

NKS type

Features of solid needle roller bearings

The dimensional accuracy, shape accuracy and rotational accuracy of solid needle roller bearings are specified in JIS B 1514 (Accuracy of Roller Bearings).
Products with precision class JIS0 are manufactured as standard, however, products with class JIS6, 5, and 4 are also available for applications that require higher rotational accuracy.
The dimensional tolerance of the roller inscribed circle diameter (Fw) of the no-inner race NK, RNA, NKS, and MR types falls within the ISO tolerance class F6. For reference when selecting the shaft diameter dimensions and radial clearance.

 

The solid needle roller bearing has the structure in which the needle rollers and retainer are assembled to the solid (machined) outer race, and the outer race and needle rollers are kept together by the flange or side walls on both sides of the outer race. The solid (machined) outer race ensures
high rigidity and can increase the bearing accuracy, therefore, it is ideal for applications that require high speed, high load, and high rotational accuracy.
In addition to the type with inner race, the type without inner race is also available in which the shaft can be used directly as a raceway instead of inner race.

 

The allowable rotational speed is the rotational speed that is allowed to achieve under the following conditions. For the allowable rotational speed under usage conditions that are different from the following, please refer to the "Precision Roller Bearing Catalog" or contact the manufacturer.
·Use under conditions where an appropriate amount of grease recommended by NTN is sealed, a sufficient break-in operation is performed, and generated heat is eliminated by such as cooling the outer housing.
・ Use with constant pressure preload.

30
45
60
  1. 1
Part Number
NK21/20R
Part NumberStandard Unit PriceMinimum order quantityVolume DiscountDays to ShipRoHSInner Dia. d
(Ø) 		Outer Dia. D
(Ø) 		Width B
(mm) 		Precision (JIS) Number of Raceway Ring Rows Size Standards Retainer Type Basic Load Rating: Dynamic Load
(N) 		Sealing Structure Lubricant Internal Clearance Symbol Specifications Revolution Frequency
(rpm) 		Series

SGD 16.47

1 Piece(s) 8 Day(s) -212920Grade 0Single RowMetric System-17400Brim Type---13000No Inner Wheel

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  1. 1
 

Basic Information

Raceway Ring Shape Needle Roller Load Direction Radial Outer Ring With Outer Ring
Inner/Outer Ring Material Steel Specifications/Environment Standard Rolling Element Material Steel
Outer Ring Type Flat

Please check the type/dimensions/specifications of the part NK21/20R in the Solid Type Needle Roller Bearing series.

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Specification/Dimensions

  • Retainer Type

    • Resin Forming

    Clear

  • Lubricant

    • 3AS: Albania
    • 3AS: Alvania
    • LP03: Heat-hardening grease

    Clear

  • Internal Clearance Symbol

    • CN (Normal Clearance)

    Clear

  • Specifications

    • Clearance adjusting shape

    Clear

  • type

    • 8Q
    • MR
    • NA
    • NK
    • NKS
    • RNA
    • RNAO

    Clear

  • Inner Dia. d(Ø)

    • 5
    • 6
    • 7
    • 8
    • 9
    • 10
    • 12
    • 14
    • 15
    • 16
    • 17
    • 18
    • 19
    • 20
    • 21
    • 22
    • 24
    • 25
    • 26
    • 28
    • 29
    • 30
    • 32
    • 34.925(1 3/8)
    • 35
    • 37
    • 38
    • 40
    • 42
    • 43
    • 45
    • 47
    • 48
    • 50
    • 52
    • 55
    • 58
    • 60
    • 63
    • 63.500(2 1/2)
    • 65
    • 68
    • 70
    • 72
    • 73
    • 75
    • 80
    • 85
    • 90
    • 95
    • 100
    • 105
    • 110
    • 115
    • 120
    • 130
    • 135
    • 145
    • 150
    • 155
    • 160
    • 165
    • 175
    • 195
    • 205
    • 245
    • 265
    • 285
    • 290
    • 330

    Clear

  • Outer Dia. D(Ø)

    • 10
    • 12
    • 13
    • 14
    • 15
    • 16
    • 17
    • 19
    • 20
    • 22
    • 23
    • 24
    • 25
    • 26
    • 27
    • 28
    • 29
    • 30
    • 32
    • 33
    • 34
    • 37
    • 38
    • 39
    • 40
    • 42
    • 45
    • 47
    • 47.625(1 7/8)
    • 48
    • 50
    • 52
    • 53
    • 55
    • 57
    • 58
    • 62
    • 68
    • 72
    • 78
    • 80
    • 82
    • 82.550(3 1/4)
    • 85
    • 90
    • 92
    • 95
    • 100
    • 105
    • 110
    • 115
    • 120
    • 125
    • 130
    • 140
    • 150
    • 165
    • 175
    • 180
    • 190
    • 200
    • 225
    • 250
    • 300
    • 320
    • 360
    • 380

    Clear

  • Width B(mm)

    • 8
    • 10
    • 11
    • 12
    • 13
    • 16
    • 17
    • 18
    • 20
    • 22
    • 23
    • 25
    • 25.40(1)
    • 26
    • 27
    • 30
    • 32
    • 34
    • 35
    • 36
    • 40
    • 44.45(1 3/4)
    • 45
    • 46
    • 50
    • 54
    • 60
    • 63
    • 67
    • 69
    • 80
    • 100

    Clear

  • Precision (JIS)

    • Grade 0
    • Grade 4

    Clear

  • Number of Raceway Ring Rows

    • Single Row
    • Double Row

    Clear

  • Size Standards

    • Metric System
    • Inch Base

    Clear

  • Sealing Structure

    • Brim Type
    • Double-sided Seal Type
    • Double-sided seal type
    • One-sided Seal Type

    Clear

  • Revolution Frequency(rpm)

    • 800
    • 950
    • 1000
    • 1100
    • 1300
    • 1400
    • 1500
    • 1600
    • 1700
    • 1800
    • 1900
    • 2000
    • 2100
    • 2200
    • 2300
    • 2400
    • 2500
    • 2700
    • 2800
    • 2900
    • 3100
    • 3300
    • 3400
    • 3600
    • 3700
    • 3800
    • 4000
    • 4300
    • 4400
    • 4700
    • 5000
    • 5500
    • 6000
    • 6500
    • 7000
    • 7500
    • 8500
    • 9000
    • 9500
    • 10000
    • 11000
    • 12000
    • 13000
    • 14000
    • 15000
    • 16000
    • 17000
    • 18000
    • 19000
    • 20000
    • 21000
    • 23000
    • 25000
    • 27000

    Clear

  • Series

    • No Inner Wheel
    • No Inner Wheel/Separated Type
    • With Inner Wheel

    Clear

  • CAD

    • 2D
    • 3D

    Clear

Days to Ship

    • All
    • Same day
    • 4 Day(s) or Less
    • 7 Day(s) or Less
    • 8 Day(s) or Less
    • 10 Day(s) or Less
    • 13 Day(s) or Less

    Clear

Specify Alterations

  • The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Similar Part Numbers

Part Number
NK10/12T2
NK10/16
NK100/26R
NK22/16R
NK22/20R
NK22/20R/LP03
Part NumberStandard Unit PriceMinimum order quantityVolume DiscountDays to ShipRoHSInner Dia. d
(Ø) 		Outer Dia. D
(Ø) 		Width B
(mm) 		Precision (JIS) Number of Raceway Ring Rows Size Standards Retainer Type Basic Load Rating: Dynamic Load
(N) 		Sealing Structure Lubricant Internal Clearance Symbol Specifications Revolution Frequency
(rpm) 		Series

SGD 10.47

1 Piece(s) Same day -101712Grade 0Single RowMetric SystemResin Forming4550----19000No Inner Wheel

SGD 11.26

1 Piece(s) Quote -101716Grade 0Single RowMetric System-5450----19000No Inner Wheel

SGD 156.04

1 Piece(s) 7 Day(s) or more -10012026Grade 0Single RowMetric System-73500Brim Type---2700No Inner Wheel

SGD 15.76

1 Piece(s) 8 Day(s) -223016Grade 0Single RowMetric System-14200Brim Type---12000No Inner Wheel

SGD 17.06

1 Piece(s) 8 Day(s) -223020Grade 0Single RowMetric System-18000Brim Type---12000No Inner Wheel

SGD 22.60

1 Piece(s) 7 Day(s) or more 10223020Grade 0Single RowMetric System-18000Brim TypeLP03: Heat-hardening grease--12000No Inner Wheel

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