Solid shafts, hollow shafts

Features

Solid and hollow shafts are high precision shafts made from quenched and tempered steel to rolling bearing quality 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 of the shafts 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 and in the construction of equipment and automatic machinery.

They can be combined with linear ball bearings, yoke type, stud type, ball bearing and profiled track rollers 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 (material number 1.1213) are induction hardened and ground; the surface hardness is 670 HV + 165 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 10880

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 in the case of X46 is 520 HV + 115 HV (52 HRC + 4 HRC). The surface hardness in the case of X90 is 580 HV + 85 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, shafts made from the materials X46Cr13 and X90CrMoV18 have only limited corrosion resistance on 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 Ra 0,3.

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 link.

Coatings

Coatings and hard chromium coating 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 coating –
Anti-wear protection

Hard chromium coating is suitable for applications in which a high degree of anti-wear protection is required. The chromium coating also offers good corrosion resistance.

Chromium coated shafts are to tolerance h7. The thickness of the chromium coating is at least 5 μm, the hardness is 800 HV to 1 050 HV.

The suffix is CR.

Corrotect –
Anti-corrosion protection

Corrosion-resistant shafts are coated with the special coating 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.

ACHTUNG

Corrotect reduces the adhesion of weld spatter.

Corrotect can be worn away by contact seals.

The coating is not permitted for direct contact with foodstuffs and is not suitable in abrasive ambient media.

For application in the food industry, the Schaeffler Group also offers the special coating Corrotect Cr(VI)-free.

It thus complies with the requirements for RoHS in accordance with EU Directive 2002/95/EC. All other advantages are identical with the standard Corrotect coating.

The suffix is RROC.

Coatings

Feature	Coating
	Corrotect		Hard chromium
	Cr(VI)-containing^**	CR(VI)-free	Hard chromium
Suffix	RRF	RROC	‒
Colour	Black	Colourless, blue to iridescent	Chromium
Coating thickness in μm	0,5 – 5,0	0,5 – 5,0	5,0 – 15,0
Composition	Zinc alloyed with iron and cobalt	Zinc alloyed with iron	Chromium
Coating hardness in HV	300	300	800 – 1 050
Anti-corrosion protection^** in h	96	96	120
Anti-wear protection	‒	‒	yes
Maximum shaft length in mm	3 500	3 500	⌀ 6 – 8 = 3 900 ⌀ ≧ 10 = 5 900
Cr(VI)-free	no	yes	no

^**Cr(VI)-containing parts are not suitable for the food industry.

^**Salt spray test to DIN 50021.

ACHTUNG

Machined surfaces, end faces and bores may be uncoated.

Available materials, coatings, tolerances

Solid and hollow shafts

Shaft diameter	Solid shafts					Hollow shafts
	Material
	Quenched and tempered steel			X46Cr13	X90CrMoV18	Quenched and tempered steel
	Tolerance^**	CR^**	RRF RROC^**	X46Cr13	X90CrMoV18	Tolerance
mm	h6	h7	h6	h6	h6	h7
4	●	‒	■	‒	●	‒
5	●	‒	■	‒	‒	‒
6	●	●	■	●	●	‒
8	●	●	■	●	●	‒
10	●	●	■	●	●	‒
12	●	●	■	●	●	●
14	●	●	■	●	●	‒
15	●	●	■	●	●	‒
16	●	●	■	●	●	●
20	●	●	■	●	●	●
25	●	●	■	●	●	●
30	●	●	■	●	●	●
40	●	●	■	●	●	●
50	●	●	■	●	●	●
60	●	●	■	‒	‒	●
80	●	●	■	‒	‒	●

■

Available by agreement.

●

Available design.

^**Hard chromium coating, see link.

^**Corrotect coating, see link.

^**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 B01 to B05 in accordance with the table.

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

Codes for hole patterns

Code		Design of holes
B01		Axial threaded hole on one side
B02		Axial threaded holes on both sides
B03		Radial threaded holes
B04		Radial threaded holes and axial threaded hole on one side
B05		Radial threaded holes and axial threaded holes on both sides

Shafts according to customer requirements

In order to place enquiries for special shafts, please use your own drawing or copy our templates and complete using the required values, ➤ Figure to ➤ Figure.

Radial holes
with and without threads

Internal threaded hole,
on one or both sides

Diameter to
DIN 336 or DIN 13

Internal threaded hole with centring hole

For threaded hole with centring hole
DIN 332-D recommended

Undercut for retaining ring

Width across flats W

Journal

Undercut type F DIN 509 (both sides)

90° undercut

Threaded journal

Thread runout to DIN 76-1A,
with undercut to DIN 76-A ·

With undercut, DIN 76-A recommended

Journal and threaded journal

With undercut, DIN 76-A recommended ·

With undercut type F, DIN 509 recommended ·

Thread runout to DIN 76-1A

Slot

Keyway

Width across flats

Flattened area

Shaft machining, shaft specification

Soft annealed shafts

Additional machining (such as journals, flattened areas, external threads) may require soft annealing of the corresponding areas. In this case, slight changes may occur in the dimensional and geometrical tolerances as well as the surface quality of the soft annealed area, ➤ Figure. Material discolouration may occur in the annealed area and there may be residual hardness in the transitional zone.

ACHTUNG

In the case of corrosion-resistant steels, the X class materials, the anti-corrosion protection is restricted here.

Soft annealed shaft

x = soft annealed area

Standard chamfer

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

Chamfer,
as a function of shaft diameter

Shaft diameter d_LW				Chamfer x	Axial runout t₄
mm				mm	mm
		d_LW ≦	8	0,5 × 45°	0,2
8	＜	d_LW ≦	10	1+1	0,2
10	＜	d_LW ≦	30	1,5+1	0,3
30	＜	d_LW ≦	80	2,5+1	0,5

Standard chamfer

Parting cut

In the case of a parting cut, the shaft is only cut to length, ➤ Figure. There is no additional machining of the end faces. A burr may be present. The suffix is T.

Parting cut

t₄ = axial runout tolerance, table

Straightness

The standard straightness is shown in ➤ Figure.

Straightness

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 joined by means of mortice and tenon joints, ➤ Figure. The joints are marked accordingly. Shafts screwed together are available by agreement.

Shaft with mortice and tenon joint

Accuracy

Length tolerance

Length tolerances are dependent on the shaft length, see table and ➤ Figure.

Special tolerances are available by agreement.

Tolerance

Shaft length L		Tolerance
mm		mm
over	incl.	max.
‒	400	±0,5
400	1 000	±0,8
1 000	2 000	±1,2
2 000	4 000	±2
4 000	6 000	±3

Length tolerance

Straightness value to ISO 13012

The measurement points are separated by a distance of 1 000 mm. Shafts ＜ 1 000 mm have a maximum of two measurement points, ➤ Figure.

The straightness tolerance is half of the dial gauge value with a shaft revolution of 360°.