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Low clearance

lead screw nuts

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What should you do in the event of unwanted axial clearance?

Zero backlash

Zero backlash

► For lifelong minimum axial backlash
► Optimal for precise positioning and
     infeed movements

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Low clearance

Low clearance

► Ensure constant axial
     and radial preload
► High operational smoothness

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AB lead screw nut

Anti-backlash

► Preload by means of spring load gauge
► Significant reduction of self-induced     
     oscillations and vibrations

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What is the axial clearance?
Yellow = Axial clearance

What is axial clearance anyway?

Axial clearance can be used to describe the lost motion, the "dead travel", on the lead screw as a result of the gap between the lead screw and the lead screw nut. The term clearance is also often associated with it, but the correct technical term is axial clearance. It is therefore the movement of the lead screw nut in the axial direction without movement of the lead screw. Lead screw units require a minimum clearance to maintain their function. If the axial clearance is too small, the torque required to move the lead screw nut will also increase. In addition to the axial clearance caused by the manufacturing tolerances, application-specific influences must also be taken into account. In addition to thermal and hygroscopic environmental influences, the minimum clearance to be considered in the application must also take into account the friction heat generated by the application. This plays a decisive role in connection with the expansion behaviour of the polymer material used. As the axial clearance in the system can change with temperature fluctuations.

What options does the igus product range offer in this case?

To reduce the unwanted axial clearance, in addition to the correct choice of material, a preload mechanism has proven to be an effective measure. For our dryspin® high helix and trapezoidal threads, there are three variants with preload: zero backlash, low clearance and AB lead screw nut. Here you will find all the advantages and necessary installation instructions for our low-backlash lead screw nuts.
 
For applications with high loads, high temperatures or in heavily polluted environments, a standard lead screw nut should always be used. The reason for this is that all three principles are cancelled out by too high loads. For this reason, the maximum static axial loads are specified separately for each lead screw nut model.

Low-clearance lead screw nuts

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Find everything you need here

Discover our dryspin lead screw technology, reduce time spent on design, and optimise your procurement process.
 
► Online shop
► Configurators
► Information
► Application examples

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Zero-backlash lead screw nut
Zero-backlash lead screw nut
Technical data

Information

One of the most precise solutions is the ZB lead screw nut. It consists of several components and adjusts itself to the service life. It is particularly suitable for lead screw drives with high helix threads for quick adjustment of small loads. The clearance-free principle ensures minimal clearance over the entire service life. Ideal for precise positioning and feed movements in medical, laboratory and printing technology as well as in the broad areas of bio-sciences.
 
The lead screw nut consists of a support nut, an adjusting ring with torsion spring, a friction disc and the axial element. With the help of the torsion spring, the preload is brought into the lead screw system.
 
► Life-long minimum axial backlash
► Precise positioning and infeed movements
 
► In dryspin® and drylin® high helix thread
► Flange lead screw nut
► Thread direction: RH
► Material: iglidur® J
 

Technical data

Technical data


thread
Max. stat. F axial
[N]
Max. idling torque
(with spring)170) 
from [Nm]

Part number
Ds5x5
75
0,02
DST-JFRM-ZB-0001-DS5X5
Ds6,35
75
0,02
DST-JFRM-ZB-0001-DS6.35
Ds6,35
75
0,02
DST-JFRM-ZB-0001-DS6.35
Ds6,35
75
0,02
DST-JFRM-ZB-0001-DS6.35
Ds6,35
75
0,02
DST-JFRM-ZB-0001-DS6.35
Ds8
150
0,03
DST-JFRM-ZB-0001-DS8
Ds8
150
0,03
DST-JFRM-ZB-0001-DS8
Ds8
150
0,03
DST-JFRM-ZB-0001-DS8
Ds10
150
0,03
DST-JFRM-ZB-0001-DS10
Ds10
150
0,03
DST-JFRM-ZB-0001-DS10
Ds10
150
0,03
DST-JFRM-ZB-0001-DS10

170)  The idling torque of the zero-backlash lead screw nut increases with service life. It is recommended that the max. idling torque be taken into account when calculating and designing purposes. 


Low-clearance lead screw nut
Low-clearance lead screw nut
Technical data
Yellow = Axial clearance

Information

Our LC lead screw nuts are all equipped with two elastomer O-rings. The functional principle is similar to the AB lead screw nut. However, with the help of the LC lead screw nut, a reduction in clearance can be achieved in this case. The O-rings apply a circumferential radial preload to the thread system, pressing the flanks of the lead screw nut and the threads of the lead screw. This ensures a constant axial and radial preload of the nut. The high operational smoothness and cost-effective purchase are further advantages of the LC lead screw nut.
 
Reduced axial clearance due to circumferential radial preload 
► High operational smoothness due to reduction of possible vibrations
► Cost-effective alternative to zero-backlash nut
 
In dryspin® high helix and trapezoidal thread up to thread diameter 14mm
Flange lead screw nut
► Direction of thread: RH
► Material: iglidur® J
 

Technical data

Technical data

dryspin® high helix thread


 
thread
Max.
stat. 
F axial 
[N]
Max. idling
torque
(with O-ring) from 
[Nm]

 
Part number
Ds6,35
40
0,005
DST-JFRM-LC-0001-DS6.35X2.54
Ds6,35
40
0,005
DST-JFRM-LC-0001-DS6.35
Ds6,35
40
0,005
DST-JFRM-LC-0001-DS6.35
Ds6,35
40
0,005
DST-JFRM-LC-0001-DS6.35
Ds8
75
0,01
DST-JFRM-LC-0001-DS8
Ds8
75
0,01
DST-JFRM-LC-0001-DS8
Ds10
75
0,01
DST-JFRM-LC-0001-DS10
Ds10
75
0,01
DST-JFRM-LC-0001-DS10
Ds10
75
0,01
DST-JFRM-LC-0001-DS10
Ds12
125
0,03
DST-JFRM-LC-0001-DS12
Ds12
125
0,03
DST-JFRM-LC-0001-DS12
Ds14
125
0,03
DST-JFRM-LC-0001-DS14
Ds14
125
0,03
DST-JFRM-LC-0001-DS14
Ds14
125
0,03
DST-JFRM-LC-0001-DS14

drylin® trapezoidal lead screw nut


Thread
single start
Max.
stat. 
F axial 
[N]
Max. idling
torque
(with O-ring) from 
[Nm]

 
Part number
Tr8x1.5
75
0,01-0,03
JFRM-LC-0001-TR8X1.5
Tr10
75
0,01-0,03
JFRM-LC-0001-TR10
Tr10
75
0,01-0,03
JFRM-LC-0001-TR10
Tr12
125
0,06
JFRM-LC-0001-TR12
Tr14
125
0,08
JFRM-LC-0001-TR14
Tr14
125
0,08
JFRM-LC-0001-TR14
Thread
multi start
 
 
 
Tr06x2P1
40
0,01-0,03
JFRM-LC-0001-TR06X2P1
Tr12
125
0,06
JFRM-LC-0001-TR12


Anti-backlash lead screw nut
Anti-backlash lead screw nut
Technical data
Yellow = Axial clearance

Information

Noise and vibrations can generally occur with the use of lead screw drives. In particular, long lead screws and long travels can cause self-induced vibrations in the systems.
 
Due to their good sliding properties, lead screw nuts made from the tribologically optimised iglidur® materials tend to develop less noise than conventional plastics or metallic materials, such as bronze or brass.
 
To reduce noise, in addition to the right choice of material, a preloading mechanism is also an effective measure. In the case of the AB lead screw nut, an elastomer ring applies a force on an insert plate with a matching thread, which is pressed into the threads of the lead screw. It is important that this preload is not present over the entire length and not all around. This ensures low axial clearance in only a small range. The functional principle of this lead screw nut differs significantly from that of the zero-backlash lead screw nut.
 
Reduction of noise and vibrations 
 
For trapezoidal threads up to thread diameter of 24mm
Cylindrical and flange lead screw nuts
Thread direction: RH and LH
Material: iglidur® J and iglidur® R
 

Technical data

Technical data

drylin® cylindrical trapezoidal lead screw nut


iglidur® J

thread
Effective supporting
surface
[mm2]
Max. stat.
F axial
[N]

Part number
Tr8
228
683
JSRM-AB-2220-TR8X1.5
Tr10
283
848
JSRM-AB-2220-TR10
Tr12
396
1.188
JSRM-AB-2220-TR12
Tr16
704
2.111
JSRM-AB-2220-TR16
Tr18
905
2.714
JSRM-AB-2220-TR18
Tr20
1.131
3.393
JSRM-AB-2220-TR20
Tr24
1.621
4.863
JSRM-AB-2220-TR24
 

Also available for left-hand thread.


 

 
iglidur® R
Lead screw
iglidur® R
Effective supporting
surface
[mm2]
Max. stat.
F axial
[N]

Part number
Tr8
228
342
RSRM-AB-2220-TR8X1.5
Tr10
283
424
RSRM-AB-2220-TR10
Tr12
396
594
RSRM-AB-2220-TR12
Tr16
704
1.056
RSRM-AB-2220-TR16
Tr18
905
1.357
RSRM-AB-2220-TR18
Tr20
1.131
1.696
RSRM-AB-2220-TR20
Tr24
1.621
2.432
RSRM-AB-2220-TR24

drylin® trapezoidal lead screw nut with flange


iglidur® J

Thread
iglidur® J
Effective supporting
surface
[mm2]
Max. stat.
F axial
[N]

Part number
Tr10
353
1.060
JFRM-AB-2220-TR10X2
Tr10
334
1.001
JFRM-AB-2220-TR10
Tr12
396
1.188
JFRM-AB-2220-TR12
Tr14
471
1.414
JFRM-AB-2220-TR14
Tr16
613
1.838
JFRM-AB-2220-TR16
Tr16
704
2.111
JFRM-AB-2220-TR16
Tr18
905
2.714
JFRM-AB-2220-TR18
Tr20
1.131
3.393
JFRM-AB-2220-TR20
Tr24
1.621
4.863
JFRM-AB-2220-TR24
Also available for left-hand thread.
 

iglidur® R
Lead screw
iglidur® R
Effective supporting
surface
[mm2]
Max. stat.
F axial
[N]

Part number
Tr10
353
530
RFRM-AB-2220-TR10X2
Tr10
334
501
RFRM-AB-2220-TR10
Tr12
396
594
RFRM-AB-2220-TR12
Tr14
471
707
RFRM-AB-2220-TR14
Tr16
613
919
RFRM-AB-2220-TR16
Tr16
704
1.056
RFRM-AB-2220-TR16
Tr18
905
1.357
RFRM-AB-2220-TR18
Tr20
1.131
1.696
RFRM-AB-2220-TR20
Tr24
1.621
2.432
RFRM-AB-2220-TR24



Consulting

I would be happy to answer your questions personally

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Thorben Hendricks

Leiter Geschäftsbereich
dryspin® Gewindetriebe

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Saturdays from 8 am- 12 pm.

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