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Rexroth: Screw Assemblies. Catalog (R999001185/2018-10) - page 10

136

Screw Assemblies | Ball Screw Assemblies BASA

Accessories

Ball Nut with Front Lube Unit

Front lube unit

The front lube unit (VSE) has been designed for the long-term,

The front lube unit can be combined with the following nut types:

maintenance-free operation of the Ball Screw Assembly. It is

-–

FEM-E-S

-- FED-E-B

attached to the nut and delivers lube oil continuously to the rolling

-–

FEM-E-C

-- FDM-E-S

elements.

-–

SEM-E-S

-- FDM-E-C

For travel up to 300 million revolutions without relubrication.

SEM-E-C

Lifelong lubrication

300

Maintenance-free up to 300 x 10⁶ revolutions

Relubrication required

100

Normal operating load

10%

15%

20%

25 %

30 %

relative load (% C)

Results confirmed by our extensive tests:

For axial loads of 15-35% of the dynamic load rating C, the ball nut will

After 300 million revolutions, the ball nut should be relubricated as

be lubed for life.

usual. The front lube unit does not have to be removed from the nut.

For axial loads of < 15% of the dynamic load rating C, the Ball Screw

Assembly will require no maintenance for up to 300 million revolutions.

Lead (mm)

Travel s with Front Lube Units¹⁾ (km)

1,500

3,000

6,000

9,600

12,000

1) max. load up to 0.15C

137

Accessories

Technical data

Ball Screw Assembly with front lube unit

R151735020

max. 51

Front lube unit

max. L

Size of VSE

Part number

(mm)

Weight (kg)

Note: The front lube unit is delivered ready-

d₀ x P

mounted to the Ball Screw Assembly.

20 x 5 R

R151715000

32.60

51.00

0,021

Only installation by the manufacturer is

20 x 20 R

permitted.

25 x 5 R

R151725010

37.50

51.00

0,027

25 x 10 R

25 x 25 R

32 x 5 R

R151735020

47.50

51.00

0,042

32 x 10 R

32 x 20 R

32 x 32 R

40 x 5 R

R151745030

55.50

53.00

0,055

40 x 10 R

R151745040

62.30

51.00

0,070

40 x 20 R

40 x 40 R

138

Screw Assemblies | Ball Screw Assemblies BASA

Accessories

Ball Nut with Front Lube Unit

BASA

32 x 10R x 3,969

FEM-E-S - 5

81K203

31K200

1000

Ordering example for front lube unit with

illustration of mounting orientation

Front lube unit on left, nut with initial greasing

Nut Unit

Front lube unit

Centering diameter D₁

(VSE)

BASA

32 x 10R x 3,969

FEM-E-S - 5

81K203

31K200

1000

Front lube unit on right, nut with initial greasing

Nut unit

Centering diameter D₁

Front lube unit

(VSE)

BASA

40 x 20R x 6

FED-E-B - 8

81K250

31K300

1000

Front lube unit on two sides, nut with initial greasing

Nut unit

Centering diameter D₁

Front lube unit

(VSE)

Nut type

Mounting orientation

Mounting orientation of

FEM-E-S

2, 3

the front lube unit on nut types

FEM-E-C

2, 3

SEM-E-S

2, 3

SEM-E-C

2, 3

FED-E-B

FDM-E-S

2, 3

FDM-E-C

2, 3

139

Accessories

Measuring pads

Alignment of the Ball Screw Assembly

in the machine

A gauge with a self-aligning contact pad is available from

Rexroth for easy alignment of the Ball Screw Assembly.

Two pads of different lengths are available which can be used

depending on the screw lead:

Part number R3305 131 19, length 33 mm for leads < 20

-–

Part number R3305 131 21, length 50 mm for leads > 20

Dial gauge not supplied as standard with the

Ball Screw Assembly

Arrestor nut

Assembly/set-up/ features

Installation on flange with hexagon socket screws for fixing the arrestor nut

Centering diameter prevents radial displacement

-–

Wiper seal is not mounted on the nut, but on the arrestor nut.

(This keeps dirt out of the space between the arrestor nut and the screw)

Length of the safety nut determines the safety factor

(Standard: 2-fold safety as against the static load capacity)

Multiple-thread arrestor nuts are used for multiple-thread screws

Recommended installation

The force or mass must always lie on the arrestor nut so that there is no

tensile loading of the fastening screws.

Screw

The fixed bearing of the screw should be located at the top.

Inspection may only be carried out by trained service engineers.

Seal

Design

Please consult our staff

Ball nut

Balls

Arrestor nut with

negative profile

Mode of operation

The ball nut with arrestor nut comprises the ball nut (for example, FEM-E-C) and an additional arrestor nut whose negative profile locks into

the screw raceway. The ball nut with arrestor nut basically works in the same way as a normal ball nut. If the ball nut fails to work

(for example, owing to a loss of balls), the arrestor nut thread comes into contact with the screw. This prevents an uncontrolled dropping of

the nut.

Use

In critical applications in non-horizontal operation (for example, in order to prevent damage to property). The arrestor nut is fitted to the nut

from below in the direction of force.

Arrestor nuts are not safety components within the meaning of the European Machinery Directive 2006/42/EC. Responsibility for the

safety of the structural design / specific application therefore still lies with you and the manufacturer. Particular attention must be paid to

ensuring that there are no hazards to people. Therefore, in particular in the case of vertically loaded axes, the structure must incorporate an

additional safety catch/holding device which prevents a drive component failure! The falling of the nut must be prevented in all cases.

140

Screw Assemblies | Ball Screw Assemblies BASA

Technical data

Technical notes

ISO 3408-1 defines a Ball Screw

Assembly as follows:

120

A ball screw drive (BASA) is a unit consist-

ing of a ball screw shaft, ball nut, and balls

Ball Screw Assembly

that is able to convert rotary motion into

100

linear motion, and vice versa.

Advantages over the Acme screw drive

Planetary Screw Assembly

The maximum mechanical efficiency of

an Acme screw drive is 50%, whereas a

Planetary Screw Assembly can achieve

90%, and a Ball Screw Assembly 98%.

Higher life expectancy due to negligible

wear during operation

Less drive power required

-–

No stick-slip effect

Acme screw

More precise positioning

-–

Higher travel speed

-–

Less heat-up

Lead angle (°)

Due to the high level of effectivity (low

friction level between the screw and the

nut), ball screw drives are not self-locking.

Safety information

If installing in a non-horizontal position,

Selection criteria for ball screw drives

customers should check whether separate

protection against falling loads is necessary,

The factors below are significant when rating a ball screw drive:

e.g. an arrestor nut. With particularly critical

Degree of accuracy required

applications in vertical operation, we recom-

(lead deviation)

mend installing arrestor nuts.

Load

Please consult us.

Service life

-–

critical speed

-–

buckling load

-–

rigidity/permissible clearance or desired preload

-–

characteristic speed (max. permissible linear speed)

The following points should be taken into consideration when selecting a PLSA that is to be

both cost-efficient and optimally designed:

The lead is a crucial factor in the load-bearing capacity (conditional on the maximum

possible ball diameter) and the drive torque.

The calculation of the service life should be based on average loads and average

speeds, not on maximum values.

In order for us to provide you with a customized solution, installation drawings or

sketches of the nut environment should be enclosed.

Note

Radial and eccentric forces relative to the screw must be avoided, as they can negatively

affect the ball screw drive’s performance and shorten its service life.

Where special conditions of use are involved, please consult us.

141

Technical data

Load ratings and service life

Load rating:

Sealing

The calculations for the load capacities and

Short stroke applications will increase the

Ball screw drives need protection from

service lives are based on ISO 3408-5. The

number of times a rolling load passes over

contamination. Flat protective covers,

dynamic load capacities in the tables are

each point within the load zone.

bellows-type dust boots, or the AGK drive

above the ISO 3408-5 values. These values

This reduces the load rating.

unit are particularly suitable for this. Since

have been confirmed in tests.

there are many applications in which these

Critical speed and buckling load

methods do not provide sufficient protec-

Static load rating C₀

The critical speed and buckling load can be

tion, we have developed a gapless lip-type

The static load rating is an axial, concentri-

checked using the corresponding charts.

seal which ensures an optimal sealing

cally acting force that induces a permanent

For precise calculations

effect and maintains high efficiency due to

deformation of 0.0001 x the ball diameter

see formula 12

15 , in the section “Design

the low friction level. This means that the

between the ball and the ball track.

Calculations3.”

standard versions of our ball screw drives

are supplied with seals. At the customer’s

Dynamic load rating C

Characteristic speed d₀· n

request, the seals can be omitted entirely

The dynamic load rating is an axial, concen-

Due to their structural design, Rexroth Ball

or special seals are used. For applications

trically acting force of constant magnitude

Screw Assemblies can be operated at very

where it appears that it is not possible to

and direction under which 90% of a suffi-

high speeds. Characteristic speeds of up

avoid severe contamination of the screw,

ciently large number of identical BASAs can

to 150,000 are possible depending on the

we have developed a reinforced variant of

achieve a nominal service life of one million

nut type.

the standard seal. The sealing effect has

revolutions.

d₀ · n

≤

150,000

been enhanced even further by increasing

d₀

= nominal diameter

(mm)

the preload. You should note the consider-

Correction factor for tolerance grades

= speed

(rpm)

ably higher frictional torque (see the techni-

The static load rating C₀ and the dynamic

The theoretically possible maximum linear

cal data) compared to standard seals which

load rating C must be multiplied by the

speed v_max (m/min) is specified on the page

leads to greater heat generation. You can

correction factor f_ac as appropriate for the

featuring the relevant nut. Actually attain-

easily recognize the reinforced seal by its

specific tolerance grade of the screw.

able speeds are heavily dependent among

dark-green color.

other factors on preload and duty cycle.

Tolerance grade T

They are generally restricted by the critical

Permissible operating temperatures

f_ac

0,9

0,8

speed. (See “Design Calculations”).

Ball screw drives permit operation at

continuous temperatures of up to 80 °C

Service life

Material, hardness

with temporary peaks of 100 °C (measure-

The nominal service life is expressed by the

BASAs are made of high-quality, heat-

ments taken on the outer shell of the nut in

number of revolutions (or number of operat-

treatable steel, carbon chrome alloy steels

each case).

ing hours at constant speed) that will be

or case-hardened steels. The screw and

attained or exceeded by 90% of a repre-

nut raceways have a minimum Rockwell

sentative sample of identical BASAs before

hardness of HRC 58.

Permissible operating temperatures:

the first signs of material fatigue become

Ball screw drives made from stainless steel

-10 °C ≤ T_operation ≤ 80 °C

evident. The nominal life is designated as

(DIN EN 10088) are available on request.

L or L_h h, depending on whether it is speci-

Normally, the screw ends are not hardened.

Permissible storage temperature

fied in revolutions or hours.

-15 °C ≤ T_bearing ≤ 80 °C

Short stroke

Bearing

Short stroke applications = stroke ≤ nut

When calculating the life expectancy of the

length

overall system, the end bearings must be

Lubrication:

considered separately.

During a short stroke, the planets do not

make a real turn. It is therefore impossible

for an adequate lubricating film to form. This

may result in premature wear.

To avoid this, it is sufficient to perform

longer strokes at regular intervals with

simultaneous relubrication as “lubricating

strokes”.

Please consult our regional centers re-

garding short stroke applications.

You can find your local contact person

at: www.boschrexroth.com/contact

142

Screw Assemblies | Ball Screw Assemblies BASA

Technical data

Acceptance Conditions and Tolerance Grades

Permissible travel deviation

Ball Screw Assembly with precision screw

According to ISO 3408-3

l₁

l₀

Symbol definitions:

l_e

(excerpt)

l₀

= nominal travel

l₁

= thread length

300

∆l₀

= travel deviation

l_u

= Useful travel

l_e

= excess travel (the closer tolerances for

travel and hardness do not apply here)

= travel compensation

(target travel deviation)

(standard: c = 0)

e_p

= tolerance mean target travel deviation

ν_300p= permissible travel deviation within

300 mm travel

= actual

= permissible

c = 0

Tolerance grade

Tolerance grades of

precision screws

ν_300p(µm)

Permissible travel deviation

Tolerance grade

within 300 mm travel

130

Useful

Tolerance for target travel

Permissible target

travel l_u

e_p(µm)

travel deviation

Tolerance grade

≤

100

110

100

200

120

200

315

130

315

d₀

l_e

Non-usable length l_e

(mm)

(Excess travel)

6, 8

Modified compared to ISO 3408-3

12, 16

20, 25, 32, 40

50, 63, 80

143

Technical data

Lead P

Minimum number of measurements for tolerance grade

Minimum number of measurements within

(mm)

300 mm (measuring interval) and excess

travel to be taken into consideration.

2.5

144

Screw Assemblies | Ball Screw Assemblies BASA

Technical data

Acceptance Conditions and Tolerance Grades

d₀

l₅

t_5p in µm for l₅

Run-outs and location deviations

t5p

AA'

for tolerance grade

Based on DIN ISO 3408-3

Over

Up to

= 6

Radial run-out t₅ of the outer diameter of

160

the screw over the length l₅ used to deter-

315

mine the straightness relative to AA'.

100

630

2 d

2 d0

l₁/d₀

t_5max in µm

for l₁≥ 4 l₅

Tolerance grade

Over

Up to

120

180

125

160

200

300

100

200

256

320

480

Nominal

Reference

t_6p in µm for l₆ ≤ l

Coaxial deviation t₆

of the bearing journal in

t6p

AA'

diameter

length

Tolerance grade

relation to AA' where l₆ ≤ l.

d₀

Table value t_6p applies if I₆ ≤ reference

Over

Up to

length I.

= 6

125

l_6a

125

200

Where l₆ > l, then

t6a ≤t

2 d0

l₆

Nominal

Reference

t_7p in µm for l₇ ≤ l

Radial run-out t₇ of the journal diameter of

Bearing seat

t7p

diameter

length

Tolerance grade

the ball screw shaft relative to the bearing

d₀

diameter for l₇ ≤ l.

Over

Up to

Table value t_7p applies if I₇ ≤ reference

= 6

length I.

125

200

l_7a

Where l₇ > l, then

t7a ≤t

Nominal diameter

t_8p in µm

Axial run-out t₈

of the shaft (bearing) face of

t8p

d₀

for tolerance grade

the ball screw shaft relative to the bearing

Over

Up to

diameter.

= 6

125

Bearing seat

Flange diameter

t_9p in µm

Axial run-out t₉

of the ball nut location face

t9p

AA'

D₅

for tolerance grade

in relation to A and A' (for preloaded ball

Over

Up to

nuts only).

125

250

2 d0

145

Technical data

Outer diameter

t_10p in µm

Radial run-out t₁₀ of the outer diameter

t10p

AA'

D₁

for tolerance grade

D₁ of the ball nut relative to A and A' (for

fixed

Over

Up to

preloaded and rotating ball nuts only).

When measuring, fix the ball screw shaft to

prevent rotation.

125

250

2 d0

Please contact us for the permissible axial

and radial run-out with a driven nut

Limiting deviation ∆T_pp for the dynamic drag

torque T_p0 resulting from preloading (for

preloaded ball nuts only)

F, F

Symbol definitions:

X = travel

= Dynamic drag torque with preload

= Dynamometer

T_p = F · l without wiper

T_t

= F_t · l with wiper

l_n

= Length of ball nut

l_u - l_n

l_u / d₀

T_p0 (Nm)

Tolerance grade

applies

≤

∆T_pp (% of T_p0); l_u ≤ 4000 mm

∆T_pp (% of T_p0); l_u > 4000 mm

≤ 40

0.4

0.6

1.0

2.5

6.3

10.0

> 40

0.4

0.6

1.0

2.5

6.3

10.0

146

Screw Assemblies | Ball Screw Assemblies BASA

Technical data

Preload and rigidity

Nut system preload

Preloaded single nut

Double nut

Single nuts can be preloaded in an

Bracing two single nuts eliminates the axial

In addition to single nuts with reduced

optimum way with preload classes C1, C2

play due to production-related issues and

backlash, Rexroth supplies preloaded or

or C3 by means of ball size selection.

increases rigidity, which improves position-

adjustable-preload nut systems.

ing accuracy.

To prevent the service life from being short-

ened, the preload should not amount to

¹/₃ of the average operating load. Depend-

ing on the application, we preload the nut

Single nut with

system with preload classes C4 or C5.

backlash

Preloaded and adjustable-

preload nut systems

Adjustable-preload single nut

Using adjustable-preload single nuts, the

Axial load

design process can be more favorably

priced for many applications.

With the same preload, the rigidity

You set the zero backlash or the preloading

behavior of these different Rexroth nut

radially by means of a slot that is approxi-

systems is virtually identical. The reason:

mately 0.1 mm wide; refer to the section

Installation of adjustable-preload single

entitled “Installation”.

nuts and preloaded single nuts is much

Depending on the application, we preload

more compact. The screw is typically far

the nut system with preload classes C1,

Driven nut FAR

less rigid than the nut unit (for details

C2 or C3. The maximum preload is preload

You can preload Series HP driven nuts like

see “Overall axial rigidity...”).

class C3.

a single nut using

preload classes C1, C2 or C3 by means of

ball size selection.

Single nut with flange FED

The HP series single nut with flange is

preloaded in an optimum way with preload

classes C1 or C2 by means of ball size

selection.

147

Technical data

Rigidity

Rigidity of the screw R_S

The rigidity of a Ball Screw Assembly is

The rigidity of the screw R_S depends on the

also affected by all adjoining parts such as

type of bearing used.

bearings, housing bores, nut housings, etc.

See the corresponding tables for rigidity

values.

Overall axial rigidity R_bs of the Ball Screw

Assembly

1 Fixed bearing of the ball screw shaft on

2 Fixed bearing of the ball screw shaft on

The overall axial rigidity R_bs is made up of

one end.

both ends.

the component rigidity of the bearing R_fb,

the screw R_S and the nut unitR_nu.

l_S2

l_S1

S2 ≤

R_bs R_fb R_S R_nu

l_S

Note:

Please note that in most cases the rigid-

(d0-0,71·D

)

ity RS of the screw will be significantly lower

165

S S2

than the rigidity R_nu of the nut unit. With

size 40 x 10, for example, the rigidity R_nu

of the nut unit is two to three times greater

than the rigidity R_S of a 500 mm-long

The lowest screw rigidity occurs at the

screw.

center of the screw R_S2min

( l_S2 = l_S/2) and thus equals:

Rigidity of the bearing R_fb

The rigidity of the bearings corresponds to

the values in the bearing manufacturer’s

catalog.

-0,71·D

)

(d -0,71 D )

165

(N/ m)

See the dimension tables in this catalog

R_S2min

660

(N/µm)

for the rigidity values of the bearings that

Rexroth can provide.

R_S1 = rigidity of the screw

(N/mm)

R_S2 = rigidity of the screw

(N/mm)

Rigidity in the area of the nut unit R_nu

d₀

= nominal diameter

(mm)

d₀

= nominal diameter

(mm)

The rigidity in the area of the preloaded nut

D_w = ball diameter

(mm)

D_w = ball diameter

(mm)

unit is calculated on the basis of

l_S1

= Bearing - nut distance

(mm)

l_S

= distance between

ISO 3408-4.

bearing and bearing

(mm)

See the corresponding tables for rigidity

l_S2

= distance between

values.

bearing and nut

(mm)

148

Screw Assemblies | Ball Screw Assemblies BASA

Technical data

Preload and rigidity of single nuts

Size

Load ratings

Backlash of single nut

Rigidity of the screw

Dynamic drag torque, preload, and

rigidity for screws of tolerance grades 3,

dyn. C

stat. C₀

Standard

Reduced

5, 7 with single nuts ZEV-E-S,

(C0)

(C00)

N·m

d₀ x P x D_w - i

(N)

(mm)

(

µm

)

FEP-E-S (C1 only),

6 x 1R x 0.8 - 3

1 080

1 030

0.01

0.005

FEM-E-S, FEM-E-C,

6 x 2R x 0.8 - 3

1 070

1 020

0.01

0.005

SEM-E-S and SEM-E-C

8 x 1R x 0.8 - 4

1 310

1 850

0.01

0.005

(pay attention to the centering diameter

8 x 2R x 1.2 - 4

2 360

2 950

0.01

0.005

8 x 2.5R x 1.588 - 3

2 640

2 800

0.02

0.010

D₁ that is to be set)

8 x 5R x 1.588 - 3

2 500

2 650

0.02

0.010

ZEM-E-S, ZEM-E-K, ZEM-E-A,

12 x 2R x 1.2 - 4

2 690

4 160

0.01

0.005

FED-E-B, FAR-B-S

12 x 5R x 2 - 3

4 560

5 800

0.02

0.010

12 x 10R x 2 - 2

3 000

3 600

0.02

0.010

16 x 5R x 3 - 3

11 300

11 800

0.04

0.020

T₀

= overall dynamic drag torque

16 x 5R/L x 3 - 4

14 800

16 100

0.04

0.020

T₀

= T_p0+ T_RD

16 x 10R x 3 - 3

11 500

12 300

0.04

0.020

= dynamic axial load capacity

16 x 16R x 3 - 2

7 560

7 600

0.04

0.020

16 x 16R x 3 - 3

11 200

12 000

0.04

0.020

C₀

= static load rating

16 x 16R x 3 - 6

17 800

24 200

0.04

0.020

F_PR = pre-tensioning force

20 x 5R/L x 3 - 4

17 200

21 500

0.04

0.020

T_RD = dynamic drag torque of the 2 seals

20 x 5R x 3 - 5

21 000

27 300

0.04

0.020

20 x 10R x 3 - 4

16 900

21 300

0.04

0.020

R_S

= rigidity of the screw

20 x 20R x 3.5 - 2

10 900

12 100

0.04

0.020

R_nu = rigidity of the nut

20 x 20R x 3.5 - 3

16 000

18 800

0.04

0.020

T_p0 = dynamic drag torque without seals

20 x 20R x 3.5 - 6

25 700

38 100

0.04

0.020

d₀

= nominal diameter

20 x 40R x 3.5 - 4

14 000

26 200

0.04

0.020

25 x 5R/L x 3 - 4

19 100

27 200

0.04

0.020

= lead

25 x 5R x 3 - 7

31 400

48 700

0.04

0.020

D_w = ball diameter

25 x 10R x 3 - 4

18 800

27 000

0.04

0.020

= Number of load-bearing gears

25 x 10R x 3 - 5

23 200

34 200

0.04

0.020

25 x 25R 3.5 - 2

12 100

15 100

0.04

0.020

25 x 25R x 3.5 - 3

17 600

23 300

0.04

0.020

25 x 25R x 3.5 - 4.8

19 700

39 400

0.04

0.020

25 x 25R x 3.5 - 6

28 500

47 100

0.04

0.020

32 x 5R/L x 3.5 - 4

25 900

40 000

0.04

0.020

144

32 x 5R x 3.5 - 5

31 700

50 600

0.04

0.020

144

The values given for dynamic drag torque

32 x 10R x 3.969 - 5

38 000

58 300

0.04

0.020

141

are proven practical indicators for the nut

32 x 20R x 3.969 - 2

16 200

21 800

0.04

0.020

141

preloading.

32 x 20R x 3.969 - 3

23 600

33 700

0.04

0.020

141

32 x 20R x 3.969 - 6

38 300

67 300

0.04

0.020

141

32 x 32R x 3.969 - 2

16 100

22 000

0.04

0.020

141

Note:

32 x 32R x 3.969 - 3

23 400

34 000

0.04

0.020

141

To measure the dynamic drag torque, see

32 x 32R x 3.969 - 4.8

26 300

57 600

0.04

0.020

141

32 x 32R x 3.969 - 6

37 900

68 000

0.04

0.020

141

the “Installation” section page 155.

32 x 64R x 3.969 - 4

21 100

49 000

0.04

0.020

141

40 x 5R/L x 3.5 - 5

34 900

64 100

0.04

0.020

232

40 x 10R/L x 6 - 4

60 000

86 400

0.07

0.035

211

40 x 10R x 6 - 5

73 400

109 300

0.07

0.035

211

40 x 10R x 6 - 6

86 500

132 200

0.07

0.035

211

40 x 12R x 6 - 4

59 900

86 200

0.07

0.035

211

40 x 16R x 6 - 4

59 600

85 900

0.07

0.035

211

40 x 20R x 6 - 3

45 500

62 800

0.07

0.035

211

40 x 20R x 6 - 8

95 500

171 100

0.07

0.035

211

40 x 25R x 6 - 4

56 900

85 800

0.07

0.035

211

40 x 25R x 6 - 8

91 400

171 700

0.07

0.035

211

40 x 30R x 6 - 4

56 300

85 100

0.07

0.035

211

40 x 30R x 6 - 8

90 400

170 300

0.07

0.035

211

40 x 40R x 6 - 2

30 600

40 300

0.07

0.035

211

40 x 40R x 6 - 3

44 400

62 300

0.07

0.035

211

40 x 40R x 6 - 6

71 500

124 500

0.07

0.035

211

50 x 5R x 3.5 - 5

38 400

81 300

0.04

0.020

373

50 x 10R x 6 - 6

95 600

166 500

0.07

0.035

345

50 x 12R x 6 - 6

95 500

166 400

0.07

0.035

345

50 x 16R x 6 - 6

95 300

166 000

0.07

0.035

345

50 x 20R x 6.5 - 3

57 500

87 900

0.07

0.035

340

50 x 20R x 6.5 - 5

90 800

149 700

0.07

0.035

340

50 x 20R x 6.5 - 8

116 500

240 000

0.07

0.035

340

40 x 25R x 6.5 - 4

56 900

85 800

0.07

0.035

211

50 x 25R x 6.5 - 6

92 600

175 100

0.07

0.035

340

50 x 30R x 6.5 - 4

71 300

118 800

0.07

0.035

340

50 x 30R x 6.5 - 8

114 500

237 700

0.07

0.035

340

50 x 40R x 6.5 - 2

38 500

55 800

0.07

0.035

340

50 x 40R x 6.5 - 3

55 800

85 900

0.07

0.035

340

50 x 40R x 6.5 - 6

89 300

171 500

0.07

0.035

340

For sizes 63 and 80, see the next page.

149

Technical data

Size

Rigidity and dynamic drag torque of the single nuts

with preload class C1

Preload class C2

Preload class C3

R_nu

F_pr

T_p0

R_nu

F_pr

T_p0

R_nu

F_pr

T_p0

(N/mm)

(N)

(Nm)

(N/mm)

(N)

(Nm)

(N/mm)

(N)

(Nm)

d₀ x P x D_w - i

Tolerance grade 3; 5; 7

6 x 1R x 0,8 - 3

6 x 2R x 0,8 - 3

8 x 1R x 0,8 - 4

8 x 2R x 1,2 - 4

8 x 2,5R x 1,588 - 3

0,004

8 x 5R x 1,588 - 3

0,003

12 x 2R x 1,2 - 4

12 x 5R x 2 - 3

100

0,009

12 x 10R x 2 - 2

0,006

16 x 5R x 3 - 3

160

190

0,030

16 x 5R/L x 3 - 4

210

250

0,040

240

370

0,060

290

620

0,100

16 x 10R x 3 - 3

160

190

0,030

190

290

0,050

220

480

0,080

16 x 16R x 3 - 2

100

130

0,020

120

190

0,030

140

320

0,050

16 x 16R x 3 - 3

160

190

0,030

180

280

0,050

210

470

0,070

16 x 16R x 3 - 6

250

280

0,050

290

430

0,070

20 x 5R/L x 3 - 4

270

290

0,060

310

430

0,090

360

720

0,140

20 x 5R x 3 - 5

340

350

0,070

390

530

0,110

450

880

0,180

20 x 10R x 3 - 4

270

280

0,060

300

420

0,090

360

710

0,140

20 x 20R x 3,5 - 2

130

180

0,040

150

270

0,060

180

460

0,090

20 x 20R x 3,5 - 3

200

270

0,050

230

400

0,080

280

670

0,130

20 x 20R x 3,5 - 6

330

410

0,080

380

620

0,130

20 x 40R x 3,5 - 4

230

280

0,060

25 x 5R/L x 3 - 4

320

0,080

360

480

0,120

430

800

0,200

25 x 5R x 3 - 7

560

520

0,130

25 x 10R x 3 - 4

320

310

0,080

370

470

0,120

430

790

0,200

25 x 10R x 3 - 5

400

390

0,100

25 x 25R 3,5 - 2

160

200

0,050

180

300

0,080

220

510

0,130

25 x 25R x 3,5 - 3

240

290

0,070

270

440

0,110

320

740

0,180

25 x 25R x 3,5 - 4,8

370

390

0,100

25 x 25R x 3,5 - 6

400

440

0,110

450

680

0,170

32 x 5R/L x 3,5 - 4

390

430

0,140

440

650

0,210

520

1 080

0,350

32 x 5R x 3,5 - 5

490

530

0,170

790

32 x 10R x 3,969 - 5

510

630

0,200

580

950

0,300

690

1 590

0,510

32 x 20R x 3,969 - 2

200

270

0,090

230

410

0,130

270

680

0,220

32 x 20R x 3,969 - 3

300

390

0,130

350

590

0,190

410

990

0,320

32 x 20R x 3,969 - 6

500

610

0,200

570

920

0,290

32 x 32R x 3,969 - 2

200

270

0,090

220

400

0,130

270

670

0,210

32 x 32R x 3,969 - 3

300

390

0,120

340

590

0,190

400

980

0,310

32 x 32R x 3,969 - 4,8

470

530

0,170

32 x 32R x 3,969 - 6

490

610

0,190

560

910

0,290

32 x 64R x 3,969 - 4

350

420

0,140

40 x 5R/L x 3,5 - 5

580

0,230

660

870

0,350

770

1 460

0,580

40 x 10R/L x 6 - 4

510

1 000

0,400

580

1 500

0,600

690

2 500

1,000

40 x 10R x 6 - 5

650

1 230

0,490

740

1 850

0,730

870

3 080

1,220

40 x 10R x 6 - 6

770

1 440

0,580

880

2 160

0,870

1 030

3 610

1,440

40 x 12R x 6 - 4

510

1 000

0,400

590

1 500

0,600

690

2 500

1,000

40 x 16R x 6 - 4

510

990

0,400

590

1 490

0,600

690

2 490

0,990

40 x 20R x 6 - 3

380

760

0,300

440

1 140

0,460

510

1 900

0,760

40 x 20R x 6 - 8

850

1 530

0,610

960

2 290

0,920

40 x 25R x 6 - 4

500

950

0,380

570

1 420

0,568

680

2 350

0,940

40 x 25R x 6 - 8

830

1 460

0,584

940

2 190

0,876

40 x 30R x 6 - 4

490

940

0,376

570

1 410

0,564

670

2 350

0,940

40 x 30R x 6 - 8

810

1 450

0,580

930

2 170

0,868

40 x 40R x 6 - 2

240

510

0,200

280

770

0,310

330

1 280

0,510

40 x 40R x 6 - 3

370

740

0,300

420

1 110

0,440

500

1 850

0,740

40 x 40R x 6 - 6

600

1 140

0,460

690

1 720

0,690

50 x 5R x 3,5 - 5

690

640

0,320

780

960

0,480

910

1 600

0,800

50 x 10R x 6 - 6

910

1 590

0,800

1 040

2 390

1,200

1 220

3 990

1,990

50 x 12R x 6 - 6

920

1 590

0,800

1 050

2 390

1,190

1 230

3 980

1,990

50 x 16R x 6 - 6

920

1 590

0,790

1 050

2 380

1,190

1 240

3 970

1,990

50 x 20R x 6,5 - 3

480

960

0,480

540

1 440

0,720

640

2 400

1,200

50 x 20R x 6,5 - 5

790

1 510

0,760

900

2 270

1,140

1 060

3 790

1,890

50 x 20R x 6,5 - 8

1 030

1 860

0,930

1 180

2 800

1,400

50 x 25R x 6.5 - 4

620

1 200

0,600

710

1 790

0,90

840

2 990

1,500

50 x 25R x 6,5 - 6

780

1 480

0,740

890

2 220

1,110

50 x 30R x 6,5 - 4

620

1 190

0,595

700

1 780

0,890

830

2 970

1,485

50 x 30R x 6,5 - 8

1 020

1 830

0,915

1 160

2 750

1,375

50 x 40R x 6,5 - 2

300

640

0,320

350

960

0,480

410

1 610

0,800

50 x 40R x 6,5 - 3

460

930

0,470

520

1 400

0,700

620

2 330

1,160

50 x 40R x 6,5 - 6

750

1 430

0,710

860

2 140

1,070

For sizes 63 and 80, see the next page.

150

Screw Assemblies | Ball Screw Assemblies BASA

Technical data

Preload and rigidity of single nuts

Size

Load ratings

Backlash of single nut

Rigidity of the screw

Standard

Reduced

R_S

dyn. C

stat. C₀

(C0)

(C00)

N·m

d₀ x P x D_w - i

(N)

(mm)

(

µm

)

63 x 10R x 6 - 6

106,600

214,300

0.07

0.035

569

63 x 20R x 6.5 - 3

63,800

112,100

0.07

0.035

563

63 x 20R x 6.5 - 5

100,700

190,300

0.07

0.035

563

63 x 20R x 6.5 - 8

130,800

292,000

0.07

0.035

563

63 x 40R x 6.5 - 2

44,300

74,300

0.07

0.035

563

63 x 40R x 6.5 - 3

64,100

114,100

0.07

0.035

563

63 x 40R x 6.5 - 6

100,000

230,600

0.07

0.035

563

80 x 10R x 6.5 - 6

130,100

291,700

0.07

0.035

938

80 x 20R x 12.7 - 6

315200

534,200

0.11

0.055

832

Preload and rigidity of double nuts

Size

Load ratings

Rigidity of the screw

Dynamic drag torque, preload, and

R_S

rigidity for screws of tolerance grades 3,

dyn. C

stat. C₀

5, 7 with double nuts

N·m

(

)

d₀ x P x D_w - i

(N)

µm

FDM-E-S, FDM-E-C

16 x 5R x 3 - 4

14,800

16,100

20 x 5R x 3 - 4

17,200

21,500

T₀

= overall dynamic drag torque

25 x 5R x 3 - 4

19,100

27,200

T₀

= T_p0+ T_RD

25 x 10R x 3 - 4

18,800

27,000

= dynamic axial load capacity

32 x 5R x 3.5 - 4

25,900

40,000

144

C₀

= static load rating

32 x 10R x 3.969 - 5

38,000

58,300

141

T_RD = dynamic drag torque of the 2 seals

40 x 5R x 3.5 - 5

34,900

64,100

232

R_S

= rigidity of the screw

40 x 10R x 6 - 4

60,000

86,400

211

R_nu = rigidity of the nut

40 x 10R x 6 - 6

86,500

132,200

211

T_p0 = dynamic drag torque without seals

40 x 20R x 6 - 3

45,500

62,800

211

d₀

= nominal diameter

50 x 5R x 3.5 - 5

38,400

81,300

373

= lead

50 x 10R x 6 - 4

66,500

109,000

345

D_w = ball diameter

50 x 10R x 6 - 6

95,600

166,500

345

= number of ball track turns

50 x 20R x 6.5 - 5

90,800

149,700

340

63 x 10R x 6 - 4

74,200

140,500

569

63 x 10R x 6 - 6

106,600

214,300

569

63 x 20R x 6.5 - 5

100,700

190,300

563

The values given for dynamic drag torque

80 x 10R x 6.5 - 6

130,100

291,700

938

are proven practical indicators for the nut

80 x 20R x 12.7 - 6

315,200

534,200

832

preloading.

Note:

To measure the dynamic drag torque, see

the “Installation” section page 155.

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