Main technical parameters of precise piston rod and mechanical grinding rod

Specification

Ф4-Ф12

Ф16-Ф50

Ф50-Ф300

Length

500-2000mm

1000-5000mm

1500-8000mm

Surface roughness

Ra0.2～0.4

Ra0.4～0.8

Ra0.4～0.8

Hardness

HB220-260

Straightness

≤0.15/1000

Roundness

≤0.01mm

Dimension Difference of Full length

≤0.02mm

Thickness of Chromium

0.02～0.05mm

Materials

Good-quality medium carbon steel of 45#、40Cr、2Cr13、Sus304 or customized

Accuracy
The linear optical shaft can ensure high accuracy of OD tolerance, straightness, circular degree and surface roughness of shaft with accumulated techniques.

The allowable tolerance of OD tolerance of linear optical shaft to diameter line bearing incircle diameter has proper clearance. The tolerance of solid shaft must be adjusted under precise operation so as to prevent clearance or added with slight pressure.

If the straightness or circular degree of shaft is not proper, adding regular pressure on solid shaft or linear bearing can’t achieve smooth linear motion but will reduce lifetime, thus it is necessary to pay attention to selection of linear optical shaft.

Type

Nominal Diameter
ФD(mm)

Roundness Tolerance
μm

Linear Tolerance
μm/m

Index of Cylindricity
S/M

Surface Roughness

Standard
S

Accuracy
S

SF3

3

-2～-8

60～-100/m

Less than
0.6/m

0.8～ 1.6

0.4～ 0.8

SF4

4

-4～-12

SF5

5

SF6

6

SF8

8

-5～-14

SF10

10

100～-150/m

Less than
1.0/m

SF12

12

-6～-17

SF13

13

SF16

16

SF20

20

-7～-20

SF25

25

SF30

30

SF35

35

-9～-25

Less than
1.4/m

SF40

40

SF50

50

SF60

60

-10～-29

SF80

80

Type

Effective Case Depth
mm

Chamfer at both ends
mm

Countersink of Hole Pouching Shaft

Weight
kg/m

Max. Length
mm

Diameter
mm

Depth
mm

Thread
M

Tapping Depth
I

SF3

More than
1.0

0.3

───

───

───

───

0.06

300

SF4

0.10

400

SF5

0.15

500

SF6

0.23

600

SF8

0.5

0.40

1000

SF10

Specified size

Specified size

Specified size

Specified size

0.62

1500

SF12

0.89

2500

SF13

1.04

3000

SF16

More than
1.5

0.7

5.5

2.5

M5×0.8

7

1.58

3000

SF20

6.5

2.5

M6×1

9

2.47

3000

SF25

6.5

2.5

M6×1

12

3.85

3000

SF30

More than
2.0

1

8.5

3.0

M8×1.25

15

5.55

3000

SF35

8.5

3.0

M8×1.25

15

7.55

4000

SF40

More than
2.5

8.5

3.0

M8×1.25

18

9.87

4000

SF50

1～1.5

10

4.0

M10×1.5

25

15.4

5000

SF60

More than
3.0

10

4.0

M10×1.5

25

22.2

5000

SF80

12

4.5

M12×1.8

30

39.5

5000

OD Separation (mm)

Allowable Tolerance of Bearing (μm)

Circular Degree

Surface Roughness

Over

Below

g6

h6

h5

4

6

-4
-12

0
-8

0
-5

Below 4

Below 1.5μmRmax

6

10

-5
-14

0
-9

0
-6

10

16

-6
-17

0
-11

0
-8

Below 5

16

30

-7
-20

0
-13

0
-9

30

50

-9
-25

0
-16

0
-11

Below 6

50

80

-10
-29

0
-19

0
-13

Below 8

80

120

-12
-34

0
-22

0
-15

Straightness of shaft

(1) The straightness is less than 0.005mm when the shaft length is less than 100mm.
(2) When the shaft length is greater than 100mm, the following formula shall be obeyed:straightness=（shaft length×0.005）/100

Note:
Please select according to operating pressure, travel and material of piston material.Diameter tolerance: ISO f7 Tolerance Standard (other tolerance as per order)
Chromium thickness: air pressure from 0.015mm to 0.025mm
Oil pressure above 0.02mm
Undertake the processing of raw materials, took customers diameter ≥ 120 　 length ≥ 3000 Consultations processing