200 Bosch Rexroth Corp. Linear Motion and Assembly Technologies

Precision steel shafts

Linear Bushings

R310A 3100

Overview

Measurements

Shaft d [mm] Heat-treated steel h6 R00 R00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RhR1000 R1000 R1000 R1000 R1000 R1000 R1000 Part numbers Solid shafts X46Cr13 h30 X90CrMoV18 h6 R20
GoTo Program products are Rhighlighted below. 31
R1000 R1000 R1000 R1000 R1000 R31

R20 R21

R30 R30

R31 R31

R20 R21 R20 R21

R30 R30 R30 R30

R31 R31 R31 R31
R20 R21 R20 R21 R20 R21 R20 R21
Linear Motion and Assembly Technologies

Bosch Rexroth Corp.

Shaft d [mm] 100 110
Part numbers Solid Shaft Hard chromium plating h6 Tubular shaft h7 Heat-treated steel h6 h7 Hard chromium plating h7

R10 R10 R10

R60 R60

R61 R61

R10 R10 R11

R10 R10

R11 R11

R41 R41

R60 R60 R60 R60

R61 R61 R61 R61

R10 R10 R10 R10 R10

R11 R11 R11 R11 R11

R41 R41 R41 R41

RA (2008.06)

Bushings and Shafts Inch Series

Bosch Rexroth Coporation

Series R1700 0XX Precision Steel Shaft Specications

Materials:

--Ck55 or C55 carbon steel (similar to AISI C-1055), case hardened to min. Rc60 to 64 Case depth shown in table 66. --X46Cr13 stainless steel (similar to AISI 420C), case hardened to min. Rc53. Case depth shown in table 66. 8 to 13 RA microinches +/- 1/32 for shafts up to 1.25 in diameter +/- 1/16 for shafts up to 1.5 in diameter and over * closer tolerances are available at additional costs
Surface nish: Length tolerances:

Straightness tolerance:

.0015 per foot

End Conditions:

Shaft ends are chamfered approximately 1/32 X 45o up to 1.25 diameter shaft and 1/16 X 45o to 1.5 diameter and up. Other chamfers can be provided at additional costs.

Shaft Selection Table

Nominal Shaft Diameter (in.) 1/4 3/8 1/2 5/8 3/1 1/1/2 1/4 Part Numbers(1) Class L -08 Actual Diameter Class L Weight lb/in 0.014 0.031 0.056 0.087 0.125 0.223 0.348 0.501 0.890 1.391 2.003 3.560 *Random Length (Avg.) Case Depth (min.) 0.019 0.027 0.031 0.043 0.047 0.059 0.059 0.062 0.086 0.086 0.086 0.110
R08 R08 R08 R08 R08 R08 R08 R08 R08 R08 R08 R08
.2495/.2490.3745/.3740.4995/.4990.6245/.6240.7495/.7490.9995/.9990 1.2495/1.2490 1.4994/1.4989 1.9994/1.9987 2.4993/2.4985 2.9992/2.9983 3.9988/3.9976

(Table 66)

*Consult Bosch Rexroth for details on longer lengths
(1)Stainless Steel Shaft: For Stainless Steel Shaft Class L use sufx -28. For plated, use sufx - 68
Order Example: Part Number ---- R08,48 material ---- Standard carbon steel diameter ---- 1/4 nominal Tolerance ---- Class L diameter Length ---- 48 long

Bosch Rexroth AG

Linear Bushings R310EN 3100 (2004.09)

Precision steel shafts

The Advantages Induction hardened and ground Solid or tubular shafts Available in various tolerances Available in heat-treated steel, corrosion-resistant steel or hard chromium plated steel Cut to customer specified lengths With chamfers to protect the Linear Bushing seal Completed per customer design As a guidance shaft for Linear Bushings As rollers, pistons and axles
R310EN 3100 (2004.09) Linear Bushings

Overview

Measurements
Shaft d [mm] Heat-treated steel h6 R00 R00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RR00 RhR1000 R1000 R1000 R1000 R1000 R1000 R1000 Part numbers Solid shafts X46Cr13 h30 R1000 R1000 R1000 R1000 R1000 R1000 RX90CrMoV18 h6 R20

h31 31

R20 R21

R30 R30

R31 R31

R20 R21 R20 R21

R30 R30 R30 R30

R31 R31 R31 R31

R20 R21 R20 R21 R20 R21 R20 R21

Shaft d [mm] 100 110

Part numbers Solid Shaft Hard chromium plating h6 Tubular shaft h7 Heat-treated steel h6 h7 Hard chromium plating h7

R10 R10 R10

R60 R60

R61 R61

R10 R10 R11

R10 R10

R11 R11

R41 R41

R60 R60 R60 R60

R61 R61 R61 R61

R10 R10 R10 R10 R10

R11 R11 R11 R11 R11

R41 R41 R41 R41

Technical Data

Dimensional accuracy and tolerance zones
The diameters of Precision Steel Shafts are accurate to within the tolerance zones h6 and h7. Details on the dimensional accuracy of the shafts are compiled in the tables on the right. The tolerance for the diameter of softannealed shaft sections may go slightly beyond the tolerance zones quoted. By request: Precision Steel Shafts may also be supplied in tolerance zone h5 (standard diameters 30 to 80 only). For special diameter tolerances,please consult us.

t3/1000

Nominal diameter d [mm] Diameter tolerance [m]

over to h6 h7

Roundness t1 [m] Taper t21) [m] Straightness t32) [m/m] Surface roughness (Ra)3) [m]

h6 h7 h6 h7

150 0.32

0.32 0.32

100 0.32

100 0.32 0.32 0.32

Dial gauge reading during straightness measurement. For lengths of less than 1 m the lowest possible value is 40 m. This corresponds to a straightness tolerance of 20 m. 2) Applies to shafts made of heat-treatable or anti-friction bearing steel only. Please contact us for surface finish and surface roughness (Ra) tolerances for hard chrome plated and corrosion-resistant steel shafts.
Measurement of straightness per ISO 13012
Measurements are performed at points equidistant between the support points and the overhanging ends of the shaft. The measured values are half the gage measurement when the shaft is rotated by 360.

A 0,3L 0,4L L

B 0,3L
Measurement of roundness The drawing shows the roundness of a raw shaft in comparision to a precision steel shaft.
58 MADE IN ENGLAND 112/ 4

SPECIMEN

Nr. 1/3

M AG N F I LT E R

M AG N

F I LT E R

TA LY RO N D
ON RG ANI SA O BS TI ON, RANK TAY LO R H

IS DIV

Raw Shaft

Precision Shaft

Shaft hardness
The surface of the shaft is inductionhardened to a depth of at least 0.4 up to 3.2 mm. depending on the shaft diameter. Surface hardness and depth of hardness are extremely uniform. both in the axial and in the circumferential direction. This is the reason for the excellent dimensional consistency and the long service life of Precision Steel Shafts. The photographs opposite show a longitudinal and a transverse section through a hardened and ground Precision Steel Shaft. The hardened surface zone has been made visible by caustic etching.
Shaft d [mm] Hardness depth1) [mm]

over to min.

Please contact us to obtain the depth of hardness for corrosion-resistant steel shafts.
Minimum hardness Solid and tubular shafts HRC 60 Corrosion-resistant steel shafts to HRC 54 ISO 683-17/ EN 10088 The graphic shows the micro-structure in the surface zone of a shaft cross section (magnification approx. 10x). The hardened outer layer of martensite and the smooth transition to the tough inner core structure are clearly visible.
Induction hardened surface zone Structure: Martensite hardness > HRC 60 (Rockwell C) Transitional structure: Martensite Troostite Pearlite
Core structure: Pearlite and ferrite

Shaft deflection

When steel shafts are used as linear motion guideways for linear bushings it is important that the shaft deflection occurring ander load is kept within certain limits, as otherwise the proper functioning and the service life of the assembly could be impaired1). To facilitate the determination of shaft deflection by calculation, we have compiled the most common load cases together with the associated deflection equations in the table below. The equations for calculation of the inclination of the shaft in the linear bushing (tan a) can also be taken from this table.

Case No. 1

Loading conditions

a x F b F a

Deflection equation
Shaft inclination in linear bushings

F a3 3a (2 I 6EJ

tan (x=a) =

f1 fm1

F a2 (3I 4a) 24 E J

F a2 b 2EJI

f2 fm2

F I3 aa 2 (1 2EJ I 3 I

fm2 = f3 =
F I3 a 4 a2 (1 ) 8EJ I 3 I2

Fab 2EJ

f3 fm3

b x F a

F I3 a3 bE J I3 I3

F I3 a3 b2 I fm3 = ( ) 3 E J I I I + 2a

f4 fm4

tan (x=b) =

F a2 b2 2b (1 I 2 E J I2

F I3 a2 b2 3EJ I I I+b 3b I+b 3a

Fa (3b2 I2 + a2) 6EJI

fm4 = f4

5 F IE J

tan (x=0) =

F IE J

There will be no loss of load-carrying capacity or service life in Super Linear Bushings a, h and H provided the shaft deflection does not exceed 30 (tan 30 = 0.0087).
The table gives the values for the maximum permissible shaft inclination (tan amax) for each size of Standard Linear Bushing. At tan a = tan amax the permissible static load capacity is approx. 0.4 CO.

Shaft d [mm] 20 25

tan max
12.3 10.0 10.1 8.5 8.5 7.2

104 104

Shaft d [mm] 80

6.4 7.3 6.3 5.7 5.7

Values for E x J and mass for steel shafts

d [mm] 80

Solid Shafts ExJ [N x mm2] 8.2.6.4.1.2.3.6.1.4.8.2.6.1.4.22 1011
Mass [kg/m] 0.06 0.10 0.15 0.39 0.61 0.88 1.20 1.57 2.45 3.83 5.51 9.80 15.32 22.05 39.21
Tubular shafts Shaft diameter ExJ outer Inner [mm] [mm] [N x mm2] 4.1.12 3.4 2.6.1.3.7.40 26.5 2.50 29.6 5.60 36.5 1.80 57.4 3.10 1011
Mass [kg/m] 0.34 0.51 0.81 1.18 1.25 2.63 3.30 5.50 9.95 13.89 19.02

Calculation values:

Modulus of elasticity Seals

2.N/mm2 7.8 g/cm3

Mill-cut lengths
Type of shafts Solid Shafts2) Diameter [mm] to 8 ab and and up to 4 to 10 up to 12 Mill-cut length1) [m] 0.4 3.6 6.2 5.7 6.1 0.4 3.6 6.1

Tubular shafts

Corrosion-resistant steel shafts
The first 50 mm at each end of mill-cut lengths may deviate slightly from the nominal diameter. 2) Solid shafts of lenghts up to 8 m and 20 and over are available upon request.
Composite shafts Plug-and-socket joints
We can supply composite shafts for applications requiring a shaft longer than the mill-cut lengths available. The shaft sections are joined together by a spigot-andrecess arrangement, one section having a locating plug and the other a mating hole (see figure below). The joined shaft must rest on a full-length, continuous support rail or must at least be supported at regular intervals with one of the supports located at the joint between the shaft sections (see "Shaft Support Rails").

Shafts with threaded joints (does not apply to corrosionresistant steel shafts)
At the customers request, the plug can be threaded and the mating hole tapped (see figure below). Line-up markings are then provided at the ends of the mating shaft sections to facilitate vertical alignment of the radial holes for attachment of the coupled shaft assembly to the shaft support rail. All machining and marking operations are carried out on the shaft sections after they have been hardened and groand. Since it will not be possible to re-grind the finished joint, extreme care is taken in the machining of the centering arrangement to ensure precision mating of the shaft sections.

Line up markings here

Shaft Machining
Chamfers Steel shafts intended for use as linear motion guideways for Linear Bushings must be chamfered at the ends to prevent damage to the ball retainers or wipers when the linear bushing is being pushed onto the shaft. The figure and the table give the dimensions of the chamfers required. Linear bushings with seals must not be pushed over sharp edges in the shaft (e.g. retaining ring grooves), as this would damage the seal lips.
Shaft d Length of Chamfer L1 [mm] [mm] 3 1

1.5 1.5 1.5 2

Machining
Hardened and gound steel shafts in mill-cut lengths are always in stock. These can be cut to any desired length and machined to have any of the following characteristics: Reduced diameter ends Male or female threads Countersinks Radial or axial holes Recesses or other specialily machined features.
Annealing of machined sections
Machined shafts may have to be annealed due to the hardened outer zone (slight measurement change possible)
Length tolerances for cut-to-size shafts
Dimensions [mm] Length Tolerance to 400 0.5 over 400 0.8 to 1000 over 1000 1.2 to 2000 over 2000 2.0 to 4000 over 4000 3.0 to 6000 over 6000 3.5 to 8000
Steel shafts with closer length tolerance can also be supplied at a surcharge.
Round and flat run of the reduced diameter end
Customers can request a trial to accomplish these values as shown. Values xxx < 0.02 upon request. xxx CD

approx. 50

Advantages Many processing options Shorter delivery times Lower cost Ordering Inquiries with customer design or template Registered dimensions and tolerances

T d1 =

d 2 = d 1 +approx. 1mm
Avoid oversizing Machining on one or both sides
Shafts with radial holes, drilled or drilled and tapped Shafts that have to be supported require radial holes for attachment of the shaft supports. The radial holes are drilled into the steel shafts after hardening and grinding. The diameter, depth and spacing of the holes depend on the diameter of the shaft. Refer to the table in the sections "Shaft Support Rails for Standard and Super Linear Bushings" and "Shaft Support Rails for Radial Linear Bushings" for standard dimensions.

d h6/h7=

nx T =
Recommended values for boring of clearing holes in the hardened surface zone
Dimensions [mm] d1 M4 M5 M6 M8 M10 M10 M12
t2 2.5 2.5 3.0 3.0 3.5 4.0 4.5
Dimensions [mm] d1 M12 M14 M16 M14 M20 M16 M24
t2 4.0 4.5 5.0 5.5 6.5 5.5 6.5
Values for corrosion-resistant steel shafts upon request.
For matching Shaft Support Rails, see the related chapter.
Shaft ends with tapped hole

L= t2 =

d h6/h7=

to DIN 336 or DIN 13

Shaft ends with tapped hole and centering bore to DIN 332-D

L= t 2=

d h6/h7= d1 =
For a tapped hole with centering bore, we recommend DIN 332-D
Recommended dimension for shaft ends with tapped hole and centering bore.

Shaft d [mm] 60 80

Thread d1/d2 M4 M4 M5 M5 M6 M8 M10 M12 M12 M16 M20 M24
Depth t1/t2 [mm] 12.5 12.50
Shaft ends for retaining ring groove to DIN 471

L0 = L= L2 =

d h6/ h7=
Shaft ends with 90 cutout

L= L2 = L0 =

Shaft ends with 90 countersink

L= L2 =

Dimensional recommendation for shaft ends for retaining ring, 90 shaft ends, 90 countersink:

d 60 80

Dimension [mm] d1 3.8 -0.04 4.8 -0.04 7.6 -0.06 9.6 -0.11 11.5 -0.11 13.4 -0.11 15.2 -0.-0.13 23.9 -0.21 28.6 -0.21 37.5 -0.-0.-0.3 76.5 -0.3

b2.5 2.6

Retaining ring DIN 471Dimension [mm] Part number 4x0.4 5x0.6 8x0.8 10x1 12x1 14x1 16x1 20x1.2 25x1.2 30x1.5 40x1.75 50x2 60x2 80x2.5 R3410 R3410 R3410 R3410 R3410 R3410 R3410 R3410 R3410 R3410 R3410 R3410 R00
0.5 0.7 0.9 1.1 1.1 1.1 1.1 1.3 1.3 1.6 1.85 2.15 2.15 2.65
Shaft ends with spigot both ends

L= L1 = L2 =

R 0,4 +0,4
or undercut type F DIN 509 (both ends)
Shaft ends with threaded spigot (both ends)

L= L1 = d h6/h7= L2 =

= Thread runout to DIN 76-a1 (DIN 76-A for undercut)
We recommend DIN 76-A for undercut
Shaft ends with spigot and threaded spigot (both ends)
L= L2 = L7 = L8 = L1 = d h6/ h7= L2 = L8 = L7 =
R 0,4 +0,4 We recommend type F DIN 509 for undercut
Thread runout to DIN 76-a1
Shaft ends with single flat (both ends)
Shaft ends with outer flats (one end)
Shaft ends with grooves (both ends)

L5 = L4 = B=

L= L5 = B= L4 =
Shaft ends with inner flats (one end)

L4 = L5 =

Spring groove to DIN 6885-1

L1= L2 =

Dimensional recommendation:
Dimensions [mm] b2 P1.1.2.3.5.9
b2 = t +0.1 +0.1 +0.1 +0.1 +0.1 +0.1 +0.2 +0.2 +0.2 +0.2 +0.2 +0.2
Shaft ends with holes tapped to pitch circle (both ends)

View X

t4 = t3 =
core hole to DIN 336 or DIN 13

d h6/h7= L=

Ordering data
Solid shafts made of heat-treated steel
When a shaft forms an integral part of an anti-friction bearing system, the materials used have to satisfy exacting requirements. Rexroth offers the optimum shaft material for each diameter range. The materials we use have a much higher carbon content compared to frequently used massproduced steels, which has a very positive influence on the achievable surface hardness and provides better resistance to aging. The exceptionally uniform surface hardness and hardening depth of Rexroth shafts, combined with an excellent degree of purity, homogeneous microstructure and defined grain sizes, ensure particularly long service life ander rolling loads.
Available diameters [mm] 3, 4, 5, 6, 8, 10, 12, 14, 15, 16, 18, 20, 22, 24, 25, 30, 32, 35, 38, 40, 45, 50, 55, 60, 70, 80, 100, 110 d [mm] 3 4-- 110 Lengths [m] 0.4 3.6 6.1
Solid shafts from 20 mm in diameter and up to 8 m in length are available upon request. Greater overall lengths are composed of sections joined end-to-end. Linear Bushing can roll over joints without any problems.
Materials Cf 53, Cf 60, Ck 67 Hardness min. 60 HRC
Part numbers Tolerance h6 R1000 xxx 00 Tolerance h7 R1000 xxx 01 xxx = Diameter in mm
Ordering example: Solid Shaft 25 h7 out of heat-treated steel. Length: 460 mm Part number: R01, 460 mm
Corrosion-resistant solid steel shafts to ISO 683-17 / EN 10088
The correct choice for applications requiring high corrosion resistance in a clean environment, e.g. in the food industry, semiconductor manufacturing and medical engineering. X 90 CrMoV 18 differs from X 46 Cr 13 in that it is additionally resistant to lactic acid.
Materials X 46 Cr 13 X 90 CrMoV 18 d [mm] 3 4-10 12-80 Materials X 46 Cr 13 X 90 CrMoV 18 Available diameters [mm] 4, 5, 6, 8, 10, 12, 14, 16, 20, 25, 30, 40, 50, 60, 80 3, 12, 16, 20, 25, 30, 40, 50, 60, 80 Lengths [m] 0.4 3.6 6.1 Hardness min. 54 HRC min. 55 HRC

Greater overall lengths are composed of sections joined end-to-end. Linear Bushing can roll over joints without any problems.
Part numbers X 46 Cr 13 Tolerance h6 R1000 0xx 30 Tolerance h7 R1000 0xx 31 Part numbers X 90 CrMoV 18 Tolerance h6 R1000 0xx 20 Tolerance h7 R1000 0xx 21 xx = Diameter in mm
Ordering example: Solid shaft 16 h6 our of corrosionresistant steel X 46 Cr 13. Length: 350 mm Part number: R30, 350 mm
Solid steel shafts with hardchromium plating
Optimum anti-corrosion protection for applications in chemically aggressive environments.
Available diameter [mm] 12, 16, 20, 25, 30, 40, 50, 60, 80 d [mm] 12 16, - 80 Materials Cf 53, Cf 60, Ck 67
Chrome plating (Thickness approx. 10 m)

Lengths [m] 5.5 6.5 7

Greater overall lengths are composed of sections joined end-to-end. Rexroth Linear Bushings can roll over joints without any problems.
Hardness min. 60 HRC (approx. 700 HV) approx. 1000 HV
Part numbers Tolerance h6 R1000 0xx 60 Tolerance h7 R1000 0xx 61 xx = Diameter in mm
Ordering example: Solidshaft 30 Hard chromium plating h7, Length 480 mm Part number: R61, 480 mm
Heat-treated tubular steel shafts
Tubular shafts are conductive and can transport liquids and gasses. Tubular shafts are also often used for weight reduction. The material is smoothly rolled. The interior diameters are rough.
Available diameter [mm] outer inner (approx.) 12 3.26.29.36.57.65 Part numbers Tolerance h6 R1001 xxx 10 Tolerance h7 R1001 xxx 11 xxx = Outer diameter in mm d [mm] 8. and 25 - 100 Lengths max. [m] 5.7 6.1

Materials Ck 60

Hardness min. 60 HRC
Ordering example: Tubular shaft 80 h7. Length 3600 mm Part number: R11. 3600 mm
Tubular shafts, hard chromium plating
The outer diameter of tubular shafts are hard-chromium plated. Available diameter [mm] Length : max 6.1 m
outer inner 26.5 29.6 36.5 57.4 Materials Ck 60 Chrome plating (Thickness approx.10 m) Hardness min. 60 HRC (approx. 700 HV) approx. 1000 HV
Part numbers Tolerance h7 R1001 0xx 41 xx = Outer diameter mm
Ordering example: Tubular shaft 40. Hard chromium plating h7. Length 2000 mm Part number: R41, 2000 mm