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NEEDLE ROLLER BEARINGS K SERIES

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NEEDLE ROLLER BEARINGS K SERIES

 

What are K series needle roller bearings?

 

 

K series needle roller bearings are full complement needle roller bearings without inner ring, which are a type of radial needle roller bearings. Their naming follows the standard code of German INA (Schaeffler Group).

 

                                 productcate-526-327

Core structure and features

 

 

No inner ring design

 

 Directly use the journal surface as the raceway (the shaft needs to be hardened and ground to Ra≤0.2μm).

 

 Save axial space and is suitable for scenarios with extremely limited radial installation dimensions

01

Full complement of needle rollers

 No cage, the needle rollers fill the raceway, providing the maximum number of rolling elements.

 Advantages: extremely high radial load capacity (30%~50% higher than the same size bearing with cage).

 Disadvantages: lower limit speed (due to increased friction of rolling elements).

02

Outer ring with double ribs

 The outer ring has rigid ribs (flanges) on both sides for axial positioning of the needle rollers.

 The rib height is usually ≤ the needle roller diameter, ensuring a compact design

03

Typical code analysis (taking INA K series as an example)

K AB×CD×EF
 AB: Inner diameter code (actual inner diameter d = AB mm)
 CD: Outer diameter D (mm)
 EF: Width B (mm)
*Example: K 20×26×20 → d=20mm, D=26mm, B=20mm*

04

 

Core Advantages

 

 

Characteristic

 

Illustrate

 
Ultra-high load capacity Full complement needle roller + small diameter roller design, the load capacity per unit area far exceeds that of deep groove ball bearings
Ultra-thin radial section The wall thickness is only 1~3mm, suitable for narrow space (such as the small end of the connecting rod, gear box housing)
High rigidity

Line contact force transmission, small deformation and good support stability.

 
Economical

No inner ring reduces manufacturing costs, and using the shaft as a raceway saves material.

 

 

 

Typical application scenarios

 

1752652140391

Automobile engine

 Piston pin bearing, connecting rod small end, transmission gear support

1752652458720

Industrial reducer

 Planetary gear support, floating end of output shaft (such as robot joint reducer)

1752652601783

Hydraulic pump/motor

 Crankshaft or eccentric shaft support (such as plunger pump

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Household appliances

 Power tool gearboxes, compressor crankshafts.

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Aerospace

 Actuator hinges, flap mechanisms (special materials/coatings required)

 
 
 

 

 

Selection and installation points

 

1. Axis Requirements (Critical!)

Hardness: ≥58 HRC (hardened steel).

Roughness: Ra ≤ 0.2 μm (mirror ground).

Tolerance: k5/m6 recommended (interference fit ensures that the shaft as a raceway does not fretting).

2. Installation Notes

The coaxiality of the shaft and the bearing seat hole must be ensured (error ≤ 0.05mm).

Clean the raceway before installation to avoid particles from pressing in and causing early failure.

Use the cold installation method (heat the bearing seat to 80~100℃), and do not hammer the outer ring

3. Lubrication requirements

The preferred lubrication is extreme pressure lithium grease (NLGI Grade 2) or circulating oil.

The initial filling volume accounts for 30%~50% of the internal space and is replenished regularly.

 

Common failure modes and prevention

Failure phenomenon

 

Cause Analysis

 

Precautions

 

Shaft wear and tear

 

Shaft hardness is insufficient/roughness exceeds the standard

 

Strictly control the shaft processing quality

 

Roller fracture

 

Installation tilt or overload impact

 

Ensure coaxiality and avoid overloading

 

Flange cracking

 

Excessive axial force (design taboo!)

 

Only bear radial load, axial retaining ring is required

 

Lubrication failure sintering

 

Grease drying or contamination

 

Regular maintenance, sealed and dustproof

 

 

 

K series needle roller bearing parameter table

 

 

 NEEDLE ROLLER BEARINGS K SERIES                                                                                productcate-456-334

 

 

Bearing NO. Dimensions  (mm) Weight (g)   Bearing NO. Dimensions (mm) Weight (g)
d D B d D B
K10*13*10 10 13 10 1.60   K18*25*22 18 25 22 23.00
K10*13*13 10 13 13 2.30 K18*23*13 19 23 13 8.00
K10*13"16 10 13 16 2.90 K19*23*17 19 23 17 11.00
K10*14*10 10 14 10 2.50 K20*24*10 20 24 10 6.50
K10*14*13 10 14 13 4.60 K20*24*13 Z0 24 13 9.00
K10*16*12 10 16 12 5.50 K20*24"17 20 24 17 12.00
K12*15*10 12 15 10 1.90 K20*26'12 20 26 12 11.00
K12*15*13 12 15 13 2.30 K20*26*13 20 26 13 12.00
K12*16*13 12 16 13 3.40 K20*26*17 20 26 17 16.00
K12*17*13 12 17 13 4.90 K20*26*20 20 26 20 19.00
K12*18*12 12 18 12 5.00 K20*28*16 20 28 16 20.00
K14*18"10 14 18 10 4.00 K20*28*20 20 28 20 27.00
K14*18*13 14 18 13 6.50 K20*28*25 20 28 25 32.00
K14*18*15 14 18 15 7.30 K20*30*30 20 30 30 49.00
K14*18*17 14 18 17 8.00 K21*25*13 21 2S 13 9.00
K14*20*12 14 20 12 8.50 K22*26*10 22 26 10 7.50
K15*18*17 15 18 17 4.60 K22*26*13 22 26 13 9.50
K15*19"10 15 19 10 5.00 K22*26*17 22 26 17 12.00
K15*19*13 15 19 13 7.00 K22*28*17 22 28 17 18.00
K15*19*17 15 19 17 8.80 K22*29*16 22 29 16 16.00
K15*20*13 15 20 13 8.90 K22*30*15 22 30 IS 18.00
K15*21"15 15 21 15 11.00 K22*32*24 22 32 24 43.00
K15*21*21 IS 21 21 17.00 K23*35*16 23 3S 16 29.00
K16*20*10 16 20 10 5.50 K24*28*10 24 26 10 8.50
K16*20*13 16 20 13 7.50 K24*28*13 24 28 13 10.00
K16*20*17 16 20 17 10.00 K24*28*17 24 28 17 13.00
K16*22*12 16 22 12 10.00 K24*30*17 24 30 17 19.00
K16*22*16 16 22 16 12.00 K25*29*10 25 29 10 8.50
K16*22*20 16 22 20 17.00 K25*23*13 2S 29 13 11.00
K16*24*20 16 24 20 22.00 K25*29*17 25 29 17 14.00
K17*21*10 17 21 10 5.50 K25*30*17 25 30 17 16.00
K17*21*13 17 21 13 6.50 K25*30*20 25 30 20 18.00
K17*21*17 17 21 17 9.50 K25*31*17 25 31 17 19.00
K18*22*10 18 22 10 6.00 K25*31*21 25 31 21 20.00
K18*22*13 18 22 13 8.00 K25*32*16 25 32 16 21.oo
K18*2Z*17 18 22 17 11.00 K25*33*20 25 33 20 33.00
K18*24*12 18 24 12 12.00 K25*33*24 25 33 24 39.00
K18*24*13 18 24 13 13.00 K25*35*30 25 35 30 65.00
K18*24*20 18 24 20 18.00 K26*30*13 26 30 13 11.00
                     
Bearing NO. Dimensions(mm) Weight (g)   Bearing NO. Dimensions(mm) Weight (g)
d D B d D B
K26"30*17 26 30 17 15.00 K40*45*17 40 45 17 31.00
K28*33*13 28 33 13 13.00 K40*45*27 40 45 27 36.00
K28*33*17 28 33 17 17.00 K40*47*18 40 47 18 39.00
K28*34*17 28 34 17 24.00 K40*47*20 40 47 20 42.00
K28*35*16 28 35 16 24.00 K40*48*20 40 48 20 49.00
K28*35*18 28 35 18 27.00 K42*47*13 42 47 13 18.00
K28*40*25 28 40 25 70.00 K42*47*17 42 47 17 32.00
K30*34*13 30 34 13 14.00 K42*50*20 42 50 20 53.00
K30*35*13 30 35 13 14.00 K43*48*17 43 48 17 30.00
K30*35*17 30 35 17 19.00 K43*48*27 43 48 27 50.00
K30*35*27 30 35 27 30.00 K45*50*17 45 50 17 34.00
K30*37*16 30 37 16 37.00 K45*50*27 45 50 27 41.00
K30*37*18 30 37 18 30.00 K45*52*18 45 52 18 42.00
K30*40*18 30 40 18 48.00 K45*53*20 45 53 20 55.00
K30*40*30 30 40 30 73.00 K4S*53*21 45 53 21 60.00
K32*38*13 32 37 13 18.00 K45*53*28 45 53 28 81.00
K32*37*17 32 37 17 19.00 K45*59*18 45 59 18 72.00
K32*37*27 32 37 27 30.00 K45*59*32 45 59 32 148.00
K32*38*20 32 38 20 30.00 K47*52*17 47 52 17 35.00
K32*39*16 32 39 16 37.00 K47*52*27 47 52 27 51.00
K32*39*18 32 39 18 45.00 K50*55*13.5 50 55 13.5 30.00
K32*40*25 32 40 25 49.00 K50*55*17 50 55 17 35.00
K32*46*32 32 46 32 119.00 K50*55*20 50 55 20 43.00
K35*40*13 35 40 13 19.00 K50*55*30 50 55 30 65.00
K35*40*17 35 40 17 21.00 K50*57*18 50 57 18 47.00
K35*40*25 35 40 25 31.00 K50*58*20 50 58 20 75.00
K35*40*27 35 40 27 39.00 K50*58*25 50 58 25 90.00
K3S*42"16 35 42 16 34.00 K52*57*12 52 57 12 24.00
K35*42*18 35 42 18 34.00 K55*60*20 55 60 20 40.00
K35*42*'20 35 42 20 37.00 K55*60*27 55 60 27 60.00
K35*42*30 35 42 30 67.00 K55*60*30 55 60 30 71.00
K35*45*30 35 45 20 56.00 K55*62*18 55 62 18 52.00
K35*45*30 35 45 30 80.00 K55*63*20 55 63 20 67.00
K37*42*17 37 42 17 22.00 K55*63*25 55 63 25 80.00
K38*43*17 38 43 17 29.00 K55*63*32 55 63 32 102.00
K38*43*27 38 43 27 43.00 K58*65*18 58 65 18 52.00
K38*46*20 38 46 20 47.00 K60*65*20 60 65 20 52.00
K38*46*32 38 46 32 76.00 K60*65*30 60 65 30 77.00
K40*45*13 40 45 13 22.00 K60*68*20 60 68 20 71.00
 
 

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