Schaeffler Product catalogue - medias
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Solid shafts, hollow shafts
Features
   
 

Solid and hollow shafts are high precision shafts made from quenched and tempered steel to rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
and are supplied in metric sizes.

 
 

Hollow shafts are particularly suitable for reduced-mass designs. For location, solid shafts can be provided with radial and axial threaded holes or can, by agreement, be produced completely in accordance with a customer drawing, see link to link.

 
   

High precision raceway
for economical
linear guidance systems

 

The material quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
guarantees high dimensional and geometrical accuracy (roundness, parallelism). Due to their high surface hardness and surface quality, the shafts are highly suitable as precision raceways for linear ball bearings.

 
 

High precision shafts are also suitable as guide rods for plain bushes, as stretch and levelling rollers
Barrel-shaped, tapered or cylindrical rolling elements
and in the construction of equipment and automatic machinery.

 
 

They can be combined with linear bearings, yoke and stud type track rollers, ball bearing track rollers
Barrel-shaped, tapered or cylindrical rolling elements
and profiled track rollers
Barrel-shaped, tapered or cylindrical rolling elements
to give linear guidance systems that are rigid, precise, economical and ready to fit, with high load carrying capacity and a long operating life.

 
   

Steels, hardness, surface, tolerances, lengths

 

Shafts made from Cf53 are induction hardened and ground; the surface hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
is 670 HV + 170 HV (59 HRC + 6 HRC).

 
 

Hollow shafts are only available made from quenched and tempered steel.

 
   

Shafts made from
corrosion-resistant steel
to ISO 683-17 and EN 10 880

 

As an alternative to quenched and tempered steel, solid shafts are also available in corrosion-resistant steels, for example X46Cr13 (material number 1.4034), or X90CrMoV18 (material number 1.4112). The surface hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
is 550 HV + 70 HV (54 HRC + 4 HRC).

 
 

These steels are particularly suitable for use in the foodstuffs industry, medical equipment and semiconductor technology.

 
 

The suffix is X46 or X90.

 
   
achtung  

Due to the hardness curve, the corrosion
Reaction of a metallic material with its environment.
resistance of shafts made from the materials X46Cr13 and X90CrMoV18 is restricted at the end faces. This also applies to any soft-annealed areas.

 
   

Hardness, surface,
tolerances, lengths

 

A uniform hardening depth will ensure a smooth transition from the hardened surface layer to the tough, normally annealed core, which can support bending stresses.

 
 

The standard surface is Ra0,3.

 
 

Solid shafts have the normal tolerance h6, while hollow shafts have h7.

 
 

High precision shafts are available in single piece lengths up to 6 000 mm. Longer shafts are available by agreement and are assembled (with mortice and tenon joints).

 
 

Available steels and tolerances see also link.

 
   

Coatings

 

Coatings and hard chromium plating
Thermo-chemical corrosion protection in which the surface layer of a material is enriched with chromium by up to 35%. Used instead of corrosion resistant materials.
provide optimum anti-wear and anti-corrosion protection for shafts and are optional. The characteristics of the coatings are also shown in the table.

 
   

Hard chromium plating
Thermo-chemical corrosion protection in which the surface layer of a material is enriched with chromium by up to 35%. Used instead of corrosion resistant materials.

Anti-wear protection

 

Hard chromium plating is suitable for applications in which a high degree of anti-wear protection
Coatings and layers on metallic materials to prevent damage from corrosion.
is required. The chromium coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
also offers good corrosion
Reaction of a metallic material with its environment.
resistance.

 
 

Chromium plated shafts are to tolerance h7. The thickness of the chromium coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
is at least 5 μm, the hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
is 800 HV to 1050 HV.

 
 

The suffix is CR.

 
   

Corrotect®
Anti-corrosion protection

 

Corrosion-resistant shafts are coated with the special coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
Corrotect® and, for production reasons, have centring or threaded holes in the end faces.

 
 

The inside diameter of hollow shafts is not coated.

 
 

Corrotect® is resistant to neutral, organic fluids such as oil, brake fluid and petrol. For applications where aqueous salt solutions in the pH range from 5 to 10 are present, Corrotect® is also suitable due to its good resistance.

 
 

The suffix is RRF.

 
 

The structure of the coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
is shown in Figure 1.

 
   
achtung  

Corrotect® reduces the adhesion of weld spatter.

 
 

Corrotect® can be worn away by contact seals.

 
 

The coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
is not permitted for direct contact with foodstuffs and is not suitable in abrasive ambient media.

 
   

Figure 1
Structure of Corrotect® coating

Medias/00016410_mei_in_0k_0k.gif Chromate layer
Medias/00016411_mei_in_0k_0k.gif ZnFe layer
Medias/00016412_mei_in_0k_0k.gif Substrate

 

imageref_324760587_All.gif

 
   

Protect A –
Anti-corrosion and anti-wear protection

 

Protect A is a columnar thin layer chromium plating. The matt grey chromium layer with its pearl structure retains a certain amount of lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
between the pearls. As a result, effective anti-wear protection is achieved even under mixed friction
Friction condition where the lubricant film is not complete and the surface peaks of the friction partners may still come into contact
or slippage conditions. During running-in, the rolling elements and seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
burnish the surface. This leads to a reduced coefficient of friction.

 
 

The anti-wear coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
Protect A has no influence on the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity and has good thermal conductivity.

 
 

The inside diameter of hollow shafts is not coated.

 
 

The suffix is KD.

 
 

The structure of the coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
is shown in Figure 2.

 
   

Figure 2
Structure of
Protect A coating

Medias/00016410_mei_in_0k_0k.gif Cr layer
Medias/00016411_mei_in_0k_0k.gif Substrate

 

imageref_324762763_All.gif

 
   

Protect B
Anti-corrosion
and high anti-wear protection

 

A columnar thin layer chromium plating
Thermo-chemical corrosion protection in which the surface layer of a material is enriched with chromium by up to 35%. Used instead of corrosion resistant materials.
is covered by chromium mixed oxide. This gives a high level of anti-wear protection
Coatings and layers on metallic materials to prevent damage from corrosion.
and good corrosion resistance.

 
 

The chromium mixed oxide layer acts in a supportive capacity to the lubricant when used in aggressive atmospheres and at high temperatures.

 
 

The inside diameter of hollow shafts is not coated.

 
 

The suffix is KDC.

 
 

The structure of the coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
is shown in Figure 3.

 
   

Figure 3
Structure of
Protect B coating

Medias/00016410_mei_in_0k_0k.gif CrNi layer
Medias/00016411_mei_in_0k_0k.gif Cr layer
Medias/00016412_mei_in_0k_0k.gif Substrate

 

imageref_324764939_All.gif

 
   
Table 1
Coatings
 

Feature
Coating
Corrotect®
Protect A
Protect B
Hard chromium plating
Colour
Black
Matt grey
Black
Chromium
Layer thickness
in μm
0,55,0
2,05,0
2,05,0
5,015,0
Composition
Zinc alloyed with iron and cobalt
Pure chromium layer
Chromium layer. Galvanic coating by electrolysis.
with pearly surface
Protect A with chromium-nickel LC coating
Chromium
Coating hardness
in HV
300
9501300
950
8001050
Anti-corrosion protection
in h
96
8
96
120
Anti-wear protection
- Under mixed friction
Under inadequate lubrication
yes
Maximum shaft length
in mm
3 500
3 500
3 500
4 000

 
   
achtung  

Machined surfaces, end faces and bores may be uncoated.

 
   
   
Table 2
Solid and hollow shafts
 

Shaft diam‑
eter
Solid shafts
Hollow shafts
Material
Quenched and tempered steel
X46Cr13
X90CrMoV18
Quenched and tempered steel
Tolerance5)
CR1)
RRF2)
KD3)
KDC4)
Tolerance
mm
h6
j5
f7
h7
h7
h6
h6
h7
4

- - -


-
5

- - -
- - -
6

- -



-
8

- -



-
10

- -



-
12

- -



-
14

- -



-
15

-




-
16







-
18

-




-
20








24

- - -


-
25








30








32



-


-
40


-




50


-




60

- -




80

- -




 
 
______
______

Available by agreement.

Available design.
 
 
 1    Hard chromium plating see link.
 
 
 2    Corrotect® coating see link.
 
 
 3    Protect A coating see link.
 
 
 4    Protect B coating see link.
 
 
 5    Other tolerances available by agreement.
 
   

Solid shafts
with threaded holes

 

Where shafts are to be supported or connected to other elements, fixing holes are required.

 
 

The standard threaded holes for solid shafts are defined as hole patterns 01 to 05 in accordance with the table.

 
 

In addition, holes may be made in accordance with a customer drawing with or without threads, Figure 4 to Figure 16.

 
   
Table 3
Codes for hole patterns
 

Code
Design of holes
01
imageref_324767115_All.gif   Axial threaded hole on one side
02
imageref_324769291_All.gif   Axial threaded holes on both sides
03
imageref_324771467_All.gif   Radial threaded hole
04
imageref_324773643_All.gif   Radial threaded holes and
axial threaded hole on one side
05
imageref_324775819_All.gif   Radial threaded holes and
axial threaded holes on both sides

 
   

Shafts according to customer requirements

 

When placing enquiries for special shafts, please use a customer drawing or copy our templates and add the required values, see Figure 4 to Figure 16.

 
   

Figure 4
Radial holes
with and without threads


 

imageref_383247627_All.gif

 
   

Figure 5
Internal threaded hole,
on one or both sides

Medias/00016410_mei_in_0k_0k.gif Diameter to
DIN 336 or DIN 13

 

imageref_383249803_All.gif

 
   

Figure 6
Internal threaded hole with centring hole

Medias/00016410_mei_in_0k_0k.gif For threaded hole with centring hole
DIN 332-D recommended

 

imageref_396688779_All.gif

 
   

Figure 7
Undercut for retaining ring


 

imageref_383343755_All.gif

 
   

Figure 8
Width across flats W


 

imageref_383345931_All.gif

 
   

Figure 9
Journal

Medias/00016410_mei_in_0k_0k.gif Or undercut type F
DIN 509 (both sides)

 

imageref_383348107_All.gif

 
   

Figure 10
90° undercut


 

imageref_383350283_All.gif

 
   

Figure 11
Threaded journal

Medias/00016410_mei_in_0k_0k.gif Thread runout to DIN 76-a1,
with undercut to DIN 76-A
Medias/00016411_mei_in_0k_0k.gif With undercut DIN 76-A recommended

 

imageref_383352459_All.gif

 
   

Figure 12
Journal and threaded journal

Medias/00016410_mei_in_0k_0k.gif With undercut DIN 76-A recommended
Medias/00016411_mei_in_0k_0k.gif With undercut type F DIN 509 recommended
Medias/00016412_mei_in_0k_0k.gif Thread runout to DIN 76-a1

 

imageref_383354635_All.gif

 
   

Figure 13
Slot


 

imageref_383358987_All.gif

 
   

Figure 14
Keyway


 

imageref_383361163_All.gif

 
   

Figure 15
Width across flats


 

imageref_383363339_All.gif

 
   

Figure 16
Flattened area


 

imageref_383365515_All.gif

 
   
   

Shaft machining, shaft specification

Soft annealed shafts

 

Additional machining (such as journals, flattened areas, external threads) may require soft annealing
Heat treatment intended to give a hardened and relatively brittle material a higher strength.
of the corresponding areas. Slight changes may occur in the dimensional and geometrical tolerances as well as the surface quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
of the soft annealed area, Figure 17. Material discolouration may occur in the annealed area and there may be residual hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
in the transitional zone.

 
   
achtung  

In the case of corrosion-resistant steels, the X class materials, the anti-corrosion protection
Coatings and layers on metallic materials to prevent damage from corrosion.
is restricted here.

 
   

Figure 17
Soft annealed shaft

x = soft annealed area

 

imageref_324808459_All.gif

 
   

Standard chamfer

 

After cutting to length, both ends of the shaft are chamfered, Figure 18 and table. However, they can also be supplied without chamfers as a parting cut, Figure 19.

 
   
Table 4
Chamfer,
as a function of shaft diameter
 

Shaft diameter
dLW
Chamfer
x
Runout
t4
mm
mm
mm

   
dLW ≦ 10
1+1
0,2
10 <
dLW ≦ 30
1,5+1
0,3
30 <
dLW ≦ 80
2,5+1
0,5

 
   

Figure 18
Standard chamfer


 

imageref_324810635_All.gif

 
   

Parting cut

 

In the case of a parting cut, the shaft is only cut to length, Figure 19. There is no additional machining of the end faces. A burr may be present. The suffix
Addition to the designation, consisting of letters and/or numbers, for example, it may indicate variants of a series
is T.

 
   

Figure 19
Parting cut

t4 = runout tolerance, table

 

imageref_324812811_All.gif

 
   

Straightness

 

The standard straightness
Description of the shortest line between two points, often confused with parallelism
is shown in Figure 20.

 
   

Figure 20
Straightness


 

imageref_324814987_All.gif

 
   

Shafts with mortice and tenon joint

 

If the shaft length is in excess of the stock length, the shafts are joined together.

 
 

The individual sections of shafts are jonied by means of mortice and tenon joints, Figure 21. The joints are marked accordingly. Shafts screwed together are available by agreement.

 
   

Figure 21
Shaft with mortice and tenon joint


 

imageref_324817163_All.gif

 
   
  
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