stroke bush slide rotary bush - nipponbearing.com

E-1

STR

OK

E BU

SH

STROKE BUSHSLIDE ROTARY BUSH

STROKE BUSHSTRUCTURE AND ADVANTAGES E-2ALLOWABLE SPEED FOR COMBINED ROTATION AND STROKE MOTION E-2RATED LOAD AND RATED LIFE ・・ E-2FIT ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ E-3USE AND HANDLING PRECAUTIONS E-5DIMENSION TABLE ・・・・・・・・・・・・・・・ E-6〜

SLIDE ROTARY BUSH SRE SERIESSTRUCTURE AND ADVANTAGES E-10RATED LOAD AND RATED LIFE ・・ E-12APPLICATION EXAMPLES ・・・・・・・・ E-14USE AND HANDLING PRECAUTIONS E-15FELT SEAL ・・・・・・・・・・・・・・・・・・・・・・・ E-15DIMENSION TABLE ・・・・・・・・・・・・・・・ E-16〜

SLIDE ROTARY BUSH RK TYPESTRUCTURE AND ADVANTAGES E-26LIFE CALCULATION ・・・・・・・・・・・・・・ E-26DIMENSION TABLE ・・・・・・・・・・・・・・・ E-27

STROKE BUSHThe NB stroke bush is a linear and rotational motion mechanism utilizing the rotational motion of ball elements between an outer cylinder and a shaft. It is compact and can withstand high loading. The retainer is made of a light metal alloy with high wear resistance. Smooth motion is achieved under high-speed and high-acceleration conditions.Although the linear motion is limited to a specific stroke length, the combined rotation and stroke motion is achieved with very little frictional resistance. The NB stroke bush can be conveniently used in a variety of applications.

STRUCTURE AND ADVANTAGESThe retainer in the NB stroke bush positions the ball elements in a zigzag arrangement. The inner surface of the outer cylinder is finished by precision grinding, resulting in smooth motion of the ball elements. Each of the ball elements is held in a separate hole and smooth motion is achieved for both rotational motion and linear motion. The retainer moves half the length of the linear motion, therefore, the stroke length is limited to approximately twice the length the retainer can travel within the outer cylinder.

High PrecisionHigh-carbon chromium bearing steel is used for the outer cylinder. It is heat treated and ground to achieve high rigidity and accuracy.

Ease of Mounting and ReplacementThe highly accurate fabrication of the NB stroke bush results in uniform dimensions, facilitating parts replacement and housing fabrication.

Light Weight and Space SavingThe use of an aluminum alloy for the retainer and the thin-wall outer cylinder makes the NB stroke bush light weight and compact.

LubricationOne lubrication hole is provided on each oil groove of the outer cylinder, making it easy to lubricate the SR stroke bush.

Figure E-1 Structure of SR Stroke Bush

outer cylinder

seal

ball elements

retainer

stopper ring

linear motion

rotation

FIT

The fits generally used between the shaft and the housing are listed in Table E-2. The inner contact diameters of the SR stroke bush are listed in the dimension tables. The shaft diameter tolerance should be selected to achieve the desired amount of radial clearance (see Table E-3). Please pay attention that high-speed linear motion can cause the retainer to slip due to inertial force.In selecting a shaft, please take note of:Hardness: 58HRC or more (refer to hardness coefficient on page Eng-5) recommendedSurface Roughness: less than Ra0.4 recommended

RATED LOAD AND RATED LIFE

The relationship between the rated load and life of the stroke bush is expressed as follows:

L: rated life fH: hardness coefficientfT: temperature coefficient　fC: contact coefficient fW: applied load coefficientC: basic dynamic load rating (N) P: applied load (N)※Refer to page Eng-5 for the coefficients.

Table E-2

Table E-3 Radial Clearance Negative Limit

part number6

8〜1012〜1620〜3035〜5060〜80

100

limit (μm)− 2− 3− 4− 5− 6− 8−10

normal operating condition vertical use or highly accurate case

shaftk5,m5

housingH6,H7

shaftn5,p6

housingJ6,J7

The allowable speed for combined rotation and stroke motion is obtained from the following equation:The value of DN is given as follows depending on the lubrication method.

ALLOWABLE SPEED FOR COMBINED ROTATION AND STROKE MOTION

DN≧dm・n＋10・S・n1

note……n≦5,000　S・n1≦50,000

for oil lubricationfor grease lubrication

DN=600,000DN=300,000

●For combined rotation and stroke motion

●For stroke motion

Lh＝ L600・S・n1/（π・dm）

Lh: life time (hr) 　S: stroke length (mm)n: revolutions per min. (rpm)　n1: number of cycles per minute (cpm)　dm: ball pitch diameter (mm) ≒ 1.15 dr

Lh＝ L60（dm・n）2＋（10・S・n1）2/dmL＝（fH・fT・fC

fW ・CP ）3

×106

TYPE

Standard Type Double Retainer TypeSR TYPE

P.E-6

SR-B TYPE

P.E-8

Table E-1　Type

E-2 E-3

STROKE BUSHS

TRO

KE B

US

H

MOUNTING

Examples of mounting methods of Stroke Bush are shown in Figure E-2. To avoid deformation, do not fix outer cylinder by using set screw.

Figure E-2 Mounting Method

using retaining rings using holding plates using set screws

LUBRICATION

Appropriate lubrication is needed to ensure the accuracy of NB Stroke Bush and to maintain bearing life. Anti-rust oil is applied to NB Stroke Bush prior to shipment. The NB selected anti-rust oil has a little to no effect on lubricants, however, please apply lubricant only after cleaning Stroke Bush with kerosene, etc.

Grease LubricantPrior to usage, please apply grease, and re-lubricate periodically according to the operating conditions. (Lithium soap-based grease is recommended.) Relubrication can be done by directly applying grease inside the ball bush or by using oil hole as Figure E-3 shows.A special low dust generation grease is optional for clean room application. Please refer to page Eng-39.

Oil LubricantPrior to usage, please apply oil directly to the shaft surface or by using oil hole as Figure E-3 shows.Turbine oil (ISO standard VG32-68) is recommended.

Figure E-3 Oil hole

Oil groove

Oil hole

The accuracies of the SR stroke bush are stated in the dimension tables. Since the outer cylinder deforms due to tension from the retaining ring, the dimension of the outer cylinder is an average value at points P,where calculated using the following equation:

W: the distance from the end of the outer cylinder to measurement point PL: the length of the outer cylinder

W＝4＋L／8

USE AND HANDLING PRECAUTIONS

Maximum StrokeThe maximum stroke in the dimension table is the stroke limit.

Retainer SlippageThe retainer can slip under high-speed motion, vertical application, unbalanced-loading, and vibrating conditions.It is suggested that the stroke to be set as a 80% of the maximum stroke in the dimension table. It is also recommended that the bush be cycled to perform the maximum stroke several times, so that the retainer returns to its central position.

Accuracy

Operating Temperature RangeThe operating temperature is ranging from -20 ℃ to 110℃. In case of operation at temperature outside this range, please contact NB.

Dust PreventionDust and other contaminations affect the bush's lifetime and accuracy if dust or particle enter into inside of bush. Although seals work under a normal environment, in a harsh environment, it is necessary to attach protective covers.

Figure E-4 Outer Cylinder Measurement Points

W WL

P P stopperring

E-4 E-5

STROKE BUSHS

TRO

KE B

US

H

SR TYPE−Standard Type−

part number structure

inner contact diameter (dr)SR type

SR

major dimensions

part number

SR 6SR 8SR 10SR 12SR 16SR 20SR 25SR 30SR 35SR 40SR 50SR 60SR 80SR100

19 24 30 32 40 50 50 82 92108138138132132

mm

mass

g

LfT T

tD dr

2-dr

dr dynamicCN

staticCoN

basic load ratingf

mmtoleranceμm

maximum stroke

mm33333333333333

6 8 10 12 16 20 25 30 35 40 50 60 80100

＋22＋13

＋27＋16

＋33＋20

＋41＋25

＋49＋30＋58/＋36

11.3 17.1 22.7 24.5 29.1 35.8 35.8 53.5 58.5 68.3 86.4 86.4 86 86

216343637

1,0701,1801,2601,3302,9903,1404,1205,5405,9807,8408,430

1N≒0.102kgf

20

number of rows

mm

Dtoleranceμm

12 15 19 23 28 32 37 45 52 60 72 85110130

0−11

0−13

0−16

0−19

0−220/−25

mm

Ltolerancemm

20 24 30 32 37 45 45 65 70 80100100100100

0 −0.2

0 −0.3

0 −0.4

T

mm 1.1 1.5 1.5 1.5 1.5 2 2 2.5 2.5 2.5 3 3 3 3

t

mm 0.5 0.5 0.5 0.5 0.7 0.7 0.7 1 1 1 1 1 1.5 1.5

d

mm 1 1.2 1.2 1.2 1.3 1.5 1.6 2 2 2 2.5 2.5 2.5 2.5

r

mm 0.5 0.5 0.5 0.5 0.5 0.5 1 1 1.5 1.5 1.5 2 2 2

147245461813990

1,1701,3303,1403,5304,8006,9108,230

12,20014,700

8.9 15.6 28.8 42 71 99 117 205 329 516 827 1,240 2,050 2,440

SR-UU TYPE−Standard Type with Seals−


major dimensions

part number

SR 8UUSR 10UUSR 12UUSR 16UUSR 20UUSR 25UUSR 30UUSR 35UUSR 40UUSR 50UUSR 60UUSR 80UUSR100UU

14 16 18 26 36 36 68 76 91116117110110

mm

mass

g

LfT T

tD dr

2-dr

dr dynamicCN

staticCoN

basic load ratingf

mmtoleranceμm

maximum stroke

mm3333333333333

8 10 12 16 20 25 30 35 40 50 60 80100

＋22＋13＋27＋16

＋33＋20

＋41＋25

＋49＋30＋58/＋36

12.3 15.5 17.1 21.1 26.8 26.8 45.1 50.1 59.9 77.4 77.4 77 77

343637

1,0701,1801,2601,3302,9903,1404,1205,5405,9807,8408,430

1N≒0.102kgf

number of rows

mm

Dtoleranceμm

15 19 23 28 32 37 45 52 60 72 85110130

0/−11

0−13

0−16

0−19

0−220/−25

mm

Ltolerancemm

24 30 32 37 45 45 65 70 80100100100100

0 −0.2

0 −0.3

0 −0.4

T

mm 1.5 1.5 1.5 1.5 2 2 2.5 2.5 2.5 3 3 3 3

t

mm 0.5 0.5 0.5 0.7 0.7 0.7 1 1 1 1 1 1.5 1.5

d

mm 1.2 1.2 1.2 1.3 1.5 1.6 2 2 2 2.5 2.5 2.5 2.5

r

mm 0.5 0.5 0.5 0.5 0.5 1 1 1.5 1.5 1.5 2 2 2

245461813990

1,170 1,330 3,140 3,530 4,800 6,910 8,23012,20014,700

15.6 28.8 42 71 99 117 205 329 516 827 1,240 2,050 2,440

inner contact diameter (dr)

SR type

SR 20 UU

seals on both sides

exampleexample

E-6 E-7

STROKE BUSHS

TRO

KE B

US

H

SR-B TYPE−Double Retainer Type−


major dimensions

part number

SR 8BSR 10BSR 12BSR 16BSR 20BSR 25BSR 30BSR 35BSR 40BSR 50BSR 60BSR 80BSR100B

8 8 816202044546688887676

mm

mass

g

LfT T

tD dr

2-dr

dr dynamicCN

staticCoN

basic load ratingf

mmtoleranceμm

maximum stroke

mm6666666666666

8 10 12 16 20 25 30 35 40 50 60 80100

＋22＋13＋27＋16

＋33＋20

＋41＋25

＋49＋30＋58/＋36

17.1 22.7 24.5 29.1 35.8 35.8 53.5 58.5 68.3 86.4 86.4 86 86

5491,0301,7201,9102,0602,1704,8005,0506,7108,9709,700

12,70013,700

1N≒0.102kgf

number of rows

mm

Dtoleranceμm

15 19 23 28 32 37 45 52 60 72 85110130

0/−11

0−13

0−16

0−19

0−220/−25

mm

Ltolerancemm

24 30 32 37 45 45 65 70 80100100100100

0 −0.2

0 −0.3

0 −0.4

T

mm 1.5 1.5 1.5 1.5 2 2 2.5 2.5 2.5 3 3 3 3

t

mm 0.5 0.5 0.5 0.7 0.7 0.7 1 1 1 1 1 1.5 1.5

d

mm 1.2 1.2 1.2 1.3 1.5 1.6 2 2 2 2.5 2.5 2.5 2.5

r

mm 0.5 0.5 0.5 0.5 0.5 1 1 1.5 1.5 1.5 2 2 2

490931

1,6301,9802,3202,6706,2707,0609,560

13,80016,50024,30029,400

16.8 31.2 46 75 106 125 220 346 540 862 1,290 2,110 2,520

SR-BUU TYPE−Double Retainer Type with Seals−


major dimensions

part number

SR 30BUUSR 35BUUSR 40BUUSR 50BUUSR 60BUUSR 80BUUSR100BUU

30384966675454

mm

mass

g

LfT T

tD dr

2-dr

dr dynamicCN

staticCoN

basic load ratingf

mmtoleranceμm

maximum stroke

mm6666666

30 35 40 50 60 80100

＋33/＋20

＋41＋25

＋49＋30＋58/＋36

45.1 50.1 59.9 77.4 77.4 77 77

4,8005,0506,7108,9709,700

12,70013,700

1N≒0.102kgf

number of rows

mm

Dtoleranceμm

45 52 60 72 85110130

0/−16

0−19

0−220/−25

mm

Ltolerancemm

65 70 80100100100100

0 −0.3

0 −0.4

T

mm 2.5 2.5 2.5 3 3 3 3

t

mm 1 1 1 1 1 1.5 1.5

d

mm 2 2 2 2.5 2.5 2.5 2.5

r

mm 1 1.5 1.5 1.5 2 2 2

6,270 7,060 9,56013,80016,50024,30029,400

220346540862

1,2902,1102,520


SR type

SR 20 B

double retainer inner contact diameter (dr)

SR type

SR 30 B

double retainer

UU

seals on both sides

example example

E-8 E-9

STROKE BUSHS

TRO

KE B

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H

SLIDE ROTARY BUSH SRE SERIES

The NB Slide Rotary Bush SRE Series provides rotary and linear motion functions. Linear motion with unlimited stroke and rotary motion are merged into a single bush resulting in great space saving compared with a combination of any conventional bearings. There are three types; standard, flange, and unit type with sizes ranging from 6 to 40.

STRUCTURE AND ADVANTAGES

NB Slide Rotary Bush features a special retainer fitted into cylindrical steel outer cylinder and is designed to guide steel balls for smooth circulation in its retainer. The retainer is also designed to rotate freely towards radial direction and offers smooth linear and rotary motions.

Smooth OperationThe inner surface of the outer cylinder allows smooth operation of linear and rotary motions while maintaining a uniform load distribution.

High Load CapacityThe use of comparatively large diameter steel balls enhances the load capacity.

Smooth RotationThe positioning of the steel balls in a cylindrical formation inside the retainer enables a smooth rotational motion regardless of the installation direction.

Complete InterchangeabilityNB Slide Rotary series is completely interchangeable with SM type Slide Bush, SMK type Flanged Slide Bush and SMA(W) type, AK(W) type and SMP type.

Figure E-5 Structure of Slide Rotary Bush SRE type

retainer

outer cylinder

side ring

ball ellements

rotation

linear motion

TYPE

Standard Type

Block TypeUnit

Square Flange Type

Double-Wide Block Type

SRE TYPE

SMA-R TYPE

AK-R TYPE

SMP-R TYPE

P.E-16

P.E-20

P.E-22

P.E-24

SREK TYPE

SMA-RW TYPE

AK-RW TYPE

P.E-18

P.E-21

P.E-23

Table E-4　Type

E-10

SLIDE ROTARY BUSHS

LIDE R

OTA

RY

BU

SH

E-11

RATED LOAD AND RATED LIFE

Equation（1）gives the relation between the applied load and the rated life of the slide rotary bush.

L: rated life (rotations)　fH: hardness coefficient　fT: temperature coefficient　fC: contact coefficient　fW: applied load coefficient　C: basic dynamic load rating (N)P: applied load (N)　※Refer to page Eng-5 for the coefficients.

Since the slide rotary bush is used in applications with combined linear and rotary motions, the life time is obtained using Equations（2）and（3）.

●When only linear motion is involved

Lh＝ L600・S・n1/（π・dm）

Lh: life time (hr)　S: stroke length (mm)　n: revolutions per minute (rpm)　n1: number of cycles per minute (cpm)dm: ball pitch diameter (mm)≒1.15dr (dr is the inner contact diameter of the SRE series)

Lh＝ L60（dm・n）2＋（10・S・n1）2/dm

The rated life and load rating are defined as follows.

Rated LifeWhen a group of slide rotary bearings of the same type are used under the same conditions, the rated life is defined as the total number of rotations made without causing flaking by 90% of the bearings.

Basic Dynamic Load Rating The basic dynamic load rating is defined as the load with a constant magnitude and direction at which a rated life of 106 rotations can be achieved.

Basic Static Load Rating The basic static load rating is defined as the load with a constant direction that would result in a certain contact stress at the mid-point of the rolling element and tracking surface that are experiencing the maximum stress.

●When linear and rotary motions are combined

……………（3）

…（2）

Calculation ExampleThe life of SRE20 type NB slide rotary bush is calculated based on the following conditions.●Conditions　Motion: Linear and rotational combined　Load: P=30N　Stroke: S=200mm　Revolutions per minute: n=15rpm　Number of cycles per minute: n1=10cpm　　Shaft surface hardness: greater than 58 HRC　Operating temperature: room temperature　Other: single shaft with single bush●Calculation　Basic dynamic load rating: C=647 N　Based on the above conditions, the life is calculated using the following coefficient values.　Hardness coefficient fH=1, Temperature coefficient fT=1, Contact coefficient fC=1　Applied load coefficient, fW=1.5　　Rated life

　　Life (in hours)

L＝（fH・fT・fCfW ・C

P ）3………………（1）×106

L＝（fH・fT・fCfW

・CP）3

＝ 2,972 × 106（rotations）＝（ 1×1×11.5 ・647

30 ）3

Lh＝L

60（dm・n）2＋（10・S・n1）2/dm

＝2,972×106

60（1.15×20×15）2＋（10×200×10）2/（1.15×20）＝56,900（h）

×106

MOUNTING

Examples of mounting methods are shown in Figure E-6. Please do not fix outer cylinder by using set screw to avoid deformation.

Figure E-6 Mounting Method

using retaining rings using holding plates using set screws

FIT

ShaftIn order to ensure high accuracy motion of Slide Rotary Bush SRE type, it is essential to select a high quality shaft. In selecting a shaft, please take note of:

Outer diameter tolerance: g6 recommendedSurface hardness: 58HRC or higher

For a shaft with surface hardness le ss t han 5 8 H RC, make a correction in life calculation by adding hardness coefficient.

Surface roughness: lower than Ra0.4 or better

HousingInner diameter tolerance: H7 recommended

E-12

SLIDE ROTARY BUSHS

LIDE R

OTA

RY

BU

SH

E-13

APPLICATION EXAMPLES

Application Example 1　Vertical Shaft Robot Arm

Slide Rotary Flange BushSREK type

SPR typeRotary Ball Spline

Application Example 2　Multiple Gearing Idler

Slide Rotary BushSRE type

Application Example 4　Turntable

Slide Rotary UnitSMA-R type

Application Example 3　Tool Changer

Slide Rotary UnitSMP-R type

USE AND HANDLING PRECAUTIONS

LubricationLubrication is needed (1) to prevent heat fusing by reducing friction between the rolling elements and the tracking surface, (2) to reduce wear of the structural elements, and (3) to prevent rusting. Lubrication affects both the performance and life of the bush. A lubrication method and a lubrication agent appropriate to the operating conditions should be selected. For oil lubrication, turbine oil (ISO standard VG32-68) is recommended. For grease lubrication, lithium soap based grease No. 2 is recommended. The replenishment interval depends on the operating conditions.

Dust PreventionDust and other contaminants affect the bush's lifetime and accuracy. Appropriate prevention methods are thus important.

Operating Temperature RangeThe operating temperature is ranging from −20℃ to 110℃. In case of operation at a temperature outside this range, please contact NB.

Retainer MaterialThe standard material of SRE Retainer is stainless steel. When requiring other material, please contact NB.

FELT SEAL

A felt seal FLM strengthens lubrication characteristics and extends relubrication period of the slide rotary bush.

Figure E-7 Felt Seal

Table E-4 Felt Seal Dimensions

part number

FLM 6FLM 8FLM 10FLM 12FLM 13FLM 16FLM 20FLM 25FLM 30FLM 40

major dimensions（mm）

6 81012131620253040

applicableslide rotary bush

SRE 6SRE 8SRE 10SRE 12SRE 13SRE 16SRE 20SRE 25SRE 30SRE 40

d12151921232832404560

D2233344555

B

B

d D

steel

ｆelt

Figure E-8 Example of InstallationInstallationThe felt seal does not work as a retaining ring. Figure E-5 shows how to install the felt seal.

E-14

SLIDE ROTARY BUSHS

LIDE R

OTA

RY

BU

SH

E-15

19242930323742596480

mass

g

1N≒0.102kgf

dynamicCN

staticCoN

drmajor dimensions

part number

SRE 6SRE 8SRE10SRE12SRE13SRE16SRE20SRE25SRE30SRE40

6 81012131620253040

SRE TYPE− Standard type −


inner contact diameter (dr)SRE type

example SRE 25

mmtolerance

μm mmtolerance

μm

＋4−5

＋3−6

＋3−7

＋3/−8

12151921232832404560

0−11

0−13

0−16

0/−19

D

78137157274323451647882

1,1801,960

176314372588686882

1,1801,8602,6504,020

10 20 39 42 56 97133293371778

basic load ratingW

mm

D1

mm 11.5 14.3 18 20 22 27 30.5 38 43 57

D

W

dr

W

B

L

D1

13.5 17.5 22 23 23 26.5 30.5 41 44.5 60.5

0 −0.2

0 −0.3

0 −0.2

0 −0.3

mmtolerance

mm

L

mmtolerance

mm

Ballowablerevolutionsper minute

rpm300300300300300250250250200200

part number

SRE 6SRE 8SRE10SRE12SRE13SRE16SRE20SRE25SRE30SRE40

1.1 1.1 1.3 1.3 1.3 1.6 1.6 1.85 1.85 2.1

※If the inner contact diameter exceeds 40 mm, please contact NB.

E-16

SLIDE ROTARY BUSHS

LIDE R

OTA

RY

BU

SH

E-17

SREK TYPE− Square Flange type −


Dmajor dimensions

part number

SREK 6SREK 8SREK10SREK12SREK13SREK16SREK20SREK25SREK30

mmtolerance

μmmm0

−13

0−16

0−19

6 810121316202530

121519212328324045

L±0.3mm192429303237425964

283240424348546274

Dfmm

Kmm222530323437425058

5 5 6 6 6 6 8 810

tmm

flange

inner contact diameter (dr)SREK type

example SREK 25

toleranceμm

dr

＋4−5

＋3−6

＋3−7

Df

P.C.D.

Y

X

Z

L

dr

D

K

t

mounting hole X 4

1N≒0.102kgf

dynamicCN

staticCoN

basic load rating

part number

SREK 6SREK 8SREK10SREK12SREK13SREK16SREK20SREK25SREK30

P.C.D.mm

X×Y×Zmm

perpendicularity

μm

mass

g202429323338435160

3.5×6×3.13.5×6×3.1

4.5×7.5×4.14.5×7.5×4.14.5×7.5×4.14.5×7.5×4.15.5×9×5.15.5×9×5.16.6×11×6.1

12

15

78137157274323451647882

1,180

176314372588686882

1,1801,8602,650

21 33 61 67 83126178355483

300300300300300250250250200

allowable revolutionsper minute

rpm

E-18

SLIDE ROTARY BUSHS

LIDE R

OTA

RY

BU

SH

E-19

SMA-R TYPE−Block type−


major dimensions

part number

SMA 6RSMA 8RSMA10RSMA12RSMA13RSMA16RSMA20RSMA25RSMA30RSMA40R

mm

mass

g

L

C±0.2W

K B±0.2

E±0.02

T

G F

h±0.02

4-S2

f

4-S1

NB mark

inner contact diameter dynamicCN

staticCoN

basic load rating

toleranceμm

6 81012131620253040

＋4−5

＋3−6

＋3−7

＋3/−8

9111315151921263040

78137157274323451647882

1,1801,960

1N≒0.102kgf

176314372588686882

1,1801,8602,6504,020

335593

104128216286645824

1,719

SMA-RW TYPE−Double-Wide Block type−


L

C±0.2

W

K B±0.2

E±0.02

T

GF

h±0.02

4-S2

N4-S1

f

A-M6×1

NB mark

SMA-R type

example SMA 25 R

inner contact diameter

hmm

15172021222527383951

Emm

30 34 40 42 44 50 54 76 78102

Wmm

Lmm25303536394450677290

18 22 26 28 30 38.5 41 51.5 59.5 78

Fmm

Gmm 15 18 21 24 24.5 32.5 35 42 49 62

6 6 8 8 8 911121520

Tmm

Bmm 20 24 28 30.5 33 36 40 54 58 80

15182126263440505860

Cmm

Kmm

5 5 6 5.75 5.5 7 7 11 10 11

M4M4M5M5M5M5M6M8M8M10

S1 fmm 8 81212121212181825

3.4 3.4 4.3 4.3 4.3 4.3 5.2 7 7 8.7

S2

mm

allowable revolutions per minuterpm

outer dimensions mounting dimensions

SMA-R type

SMA 25 R


W

double type

major dimensions

part number

SMA 6RWSMA 8RWSMA10RWSMA12RWSMA13RWSMA16RWSMA20RWSMA25RWSMA30RWSMA40RW

mm

mass

g


staticCoN

basic load rating

toleranceμm

6 81012131620253040

＋4−5

＋3−6

＋3−7

＋3/−8

9111315151921263040

126222254444523731

1,0501,4301,9103,180

1N≒0.102kgf

352628744

1,1801,3701,7602,3603,7205,3008,040

68113188210254431568

1,2821,6383,419

hmm

15172021222527383951

Emm

30 34 40 42 44 50 54 76 78102

Wmm

Lmm 48 58 68 70 75 85 96130140175

18 22 26 28 30 38.5 41 51.5 59.5 78

Fmm

Gmm 15 18 21 24 24.5 32.5 35 42 49 62

7 7 7 6.5 6.5 6 7 4 5 5

Tmm

Bmm 20 24 28 30.5 33 36 40 54 58 80

36 42 46 50 50 60 70100110140

Cmm

Kmm

5 5 6 5.75 5.5 7 7 11 10 11

M4M4M5M5M5M5M6M8M8M10

S1 fmm 8 81212121212181825

3.4 3.4 4.3 4.3 4.3 4.3 5.2 7 7 8.7

S2

mm



6 6 8 8 8 911121520

Nmm

example

300300300300300250250250200200

300300300300300250250250200200

E-20

SLIDE ROTARY BUSHS

LIDE R

OTA

RY

BU

SH

E-21

AK-R TYPE−Compact Block type−


W LL2±0.2L1±0.2

E±0.02

tf d

F

h±0.02

2-S12-S2 Hpilot holeS3

NB mark

AK-RW TYPE−Double-Wide Compact Block type−


WLL1±0.2L2±0.2

E±0.02

tf d

F

h±0.02

2-S12-S2

Hpilot holeS3

NB mark

AK-R type

example AK 25 R


AK-R type

AK 25 R


W

double type

example

major dimensions

part number

AK 6RAK 8RAK10RAK12RAK13RAK16RAK20RAK25RAK30R

mm

mass

g


staticCoN

basic load rating

toleranceμm

6 810121316202530

＋4−5

＋3−6

＋3−7

141619202527313740

78137157274323451647882

1,1801N≒0.102kgf

176314372588686882

1,1801,8602,650

27 48 94105151238328669856

hmm

81013141518212629

Emm

162026283036425258

Wmm

Lmm273239404247526974

222632344349546571

Fmm

L2

mm182027272832364244

M4M5M6M6M6M6M8M10M10

S1 fmm 8 8.5 9.5 9.5 13.5 13 15 17 17.5

91015151618182222

L1

mmt

mm556677899

3.5 3.5 4.5 4.5 5.2 5.2 7 8.9 8.9


S3

mmS2 d

mm 6 6 8 8 9 9111414

5 5 6 6 7 7 81010

Hmm



300300300300300250250250200

major dimensions

part number

AK 6RWAK 8RWAK10RWAK12RWAK13RWAK16RWAK20RWAK25RWAK30RW

mm

mass

g


staticCoN

basic load rating

toleranceμm

6 810121316202530

＋4−5

＋3−6

＋3−7

141619202527313740

126222254444523731

1,0501,4301,910

1N≒0.102kgf

352628744

1,1801,3701,7602,3603,7205,300

4889

175196281450626

1,2991,662

hmm

81013141518212629

Emm

162026283036425258

Wmm

Lmm 46 56 68 70 74 84 94128138

222632344349546571

Fmm

L2

mm203036364252588090


S1 fmm 8 8.5 9.5 9.5 13.5 13 15 17 17.5

30 42 50 50 55 65 70100110

L1

mmt

mm556677899


3.5 3.5 4.5 4.5 5.2 5.2 7 8.9 8.9

S2 S3

mmd

mm 6 6 8 8 9 9111414

5 5 6 6 7 7 81010

Hmm



300300300300300250250250200

E-22

SLIDE ROTARY BUSHS

LIDE R

OTA

RY

BU

SH

E-23

SMP-R TYPE−Pillow Block type−


W

B

L

C

M

E±0.1 P

G

F

h±0.02

4-S1

S2

1N≒0.102kgf

dynamicCN

staticCoN

major dimensions

part number

SMP13RSMP16RSMP20RSMP25RSMP30RSMP40R

mm131620253040

basic load rating

252934404560

hmm

Emm

25 27.5 32.5 38 42.5 62

50 55 65 76 85124

Wmm

outer dimensions part number

SMP13RSMP16RSMP20RSMP25RSMP30RSMP40R

Cmm

S1

mm

adjustment screw size

S2

mass

g262935404664

7（M5） 7（M5） 8（M6） 8（M6）10（M8）12（M10）

M5M5M6M6M8M10

323451647882

1,1801,960

686882

1,1801,8602,6504,020

266369690970

1,4203,585

toleranceμm


＋3−6

＋3−7

＋3/−8

allowable revolutions per minute

rpm

SMP-R type

example SMP 25 R


323742596480

Lmm

46 53 62 73 84112

Fmm

Gmm 81012121518

364048596986

Mmm

Bmm303540505876

Pmm303237434968

mounting dimensions

300250250250200200

E-24

SLIDE ROTARY BUSHS

LIDE R

OTA

RY

BU

SH

E-25

SLIDE ROTARY BUSH RK TYPE

NB's RK type slide rotary bush is a highly accurate and high load capacity bearing providing smooth continuous linear and rotational motions. Its structure imposes no constraints on linear and rotational motions. It is much more compact than a standard slide bush with separate rotational bearing.

STRUCTURE AND ADVANTAGES

The RK type slide rotary bush uses a retainer similar to that used in the SR type stroke bush. This retainer gives a smooth motion in a high rotational application. SM type slide bush is incorporated, providing the stable and smooth linear motion. Relatively large ball elements are used for high load capacity.

Figure E-9 Structure of RK Slide Rotary Bush

outer cylinder

retainerslide bush

linear motion

rotation

1．A smooth unlimited linear and rotational motion is obtained.

2．There is no need to machine separate housing.

3．High accuracy is ensured for extended period of usage.

4．Its high compatibility eliminates replacement problems.

5．High r ig id i t y enab les i t to withstand an unbalanced load and large load.

※For best performance, please select tolerance of h5 for the shaft.

L: rated life (km)　fH: hardness coefficientfT: temperature coefficient　fC: contact coefficientfW: applied load coefficientC: basic dynamic load rating (N)　P: applied load (N)※Refer to page Eng-5 for the coefficients.

RK TYPE


mounting hole x 4

（45°）

Ad（oil hole）

K

P.C.D. Y

Ddr

LtZ

X

Df

major dimensions

part number

RK12GUURK16GUURK20GUURK25GUURK30GUU

mm

mass

g

dr dynamicCN

staticCoN

basic load rating

toleranceμm

1216202530

0− 9

0−10

510774882980

1,5701N≒0.102kgf

7841,1801,3701,5702,740

Dfmm5462748296

Kmm

allowable revolutions per minute rpm

flange


RK type

example RK 25 G

resin retainer

UU

seals on both sides

mm

Dtoleranceμm

3240455260

0−25

0−30

mm

Ltolerancemm

3645506774

±0.3

4250586475

tmm 8 8101013

P.C.D.mm4351606778

5.5×9×5.15.5×9×5.16.6×11×6.16.6×11×6.19×14×8.1

X×Y×Zmm

500500400400400

180280420680990

A

mm

d

mm1519.521.528.531

22333

OH

oil holeblank: without oil holeOH: with oil hole *

-

＊Oil hole is for rotary-portion lubrication.

FITShaftIn order to ensure high accuracy motion of Slide Rotary Bush RK type, it is essential to select a high quality shaft. In selecting a shaft, please take note of:

Outer diameter tolerance: h5 recommendedSurface hardness: 58HRC or higher

For a shaft with surface hardness le ss t han 5 8 H RC, make a correction in life calculation by adding hardness coefficient.

Surface roughness: lower than Ra0.4 or better

HousingInner diameter tolerance is not requested. Please insert into an installation bore which is slightly larger than the outer cyliner.

Calculation of Life:

L＝（fH・fT・fCfW ・C

P ）3×50

E-26

SLIDE ROTARY BUSHS

LIDE R

OTA

RY

BU

SH

E-27

stroke bush slide rotary bush - nipponbearing.com

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