Expansion of dryspin® lead screw nuts from plastic rod

Self-lubricating with high efficiency: Product range [mm]

The new dryspin® lead screw nuts made from bar stock in a cylindrical, flange or spanner flat version with the new pitches DS8x2 RH, DS10x2 LH and DS20x50 LH.

Type	Part No.	Thread	d1	d2	d3	d4	d5	b1	b2	SW
Cylindrical lead screw nuts	DST-□SRM-1812DS8x2	DS8x2	8	18	-	-	-	12	-	-
Cylindrical lead screw nuts	DST-□SLM-2220DS10x2	DS10x2	10	22	-	-	-	20	-	-
Cylindrical lead screw nuts	DST-□SLM-4540DS20x50	DS20x50	20	45	-	-	-	40	-	-
Cylindrical lead screw nut with spanner flat	DST-□SLM-172220DS10x2	DS10x2	10	22	-	-	-	20	-	17
Cylindrical lead screw nut with spanner flat	DST-□SLM-304540DS20x50	DS20x50	20	45	-	-	-	40	-	30
Flange lead screw nut	DST-□FRM-2020DS8x2	DS8x2	8	20	36	28	4.0	20	8	-
Flange lead screw nut	DST-□FLM-2525DS10x2	DS10x2	10	25	42	34	5.0	25	10	-
Flange lead screw nut	DST-□FLM-3244DS20x50	DS20x50	20	32	55	45	7.0	44	12	-
Flange lead screw nut with spanner flat	DST-□FRM-202020DS8x2	DS8x2	8	20	36	28	4.0	20	8	20
Flange lead screw nut with spanner flat	DST-□FLM-252525DS10x2	DS10x2	10	25	42	34	5.0	25	10	25
Flange lead screw nut with spanner flat	DST-□FLM-323244DS20x50	DS20x50	20	32	55	45	7.0	44	12	32

□ = Material selection: further information can be found here

▲ Smoother operation thanks to tighter manufacturing tolerances and rounded tooth geometries as standard
▼ Up to 50.9% more cost-effective compared to metallic lead screw nuts
■  Up to 25% less wear compared to POM+PTFE (dimensions 10x3): To the test report
●  No lubricating grease or oil in the lead screw drive and long-lasting use thanks to patented asymmetry

The new dimensions of the dryspin® lead screw nuts made of bar stock at a glance

Further important information:

dryspin® thread geometry

Smooth operation, less vibration - THE alternative to trapezoidal threads

What does lead screw technology mean and what do i understand by it?
Lead screw technology is a part of drive technology and, roughly speaking, describes the repetitive conversion of a rotary movement into a translatory movement within regular cycles. The dryspin® lead screw technology patented in 2014 by the dryspin® lead screw technology development team. Particular emphasis was placed on increasing service life and improving efficiency. The dryspin® product portfolio includes high-helix lead screws made of stainless steel or aluminium and the matching lead screw nuts made of igus® high-performance polymers. They are available from 1mm to 100mm pitch. The dryspin® thread geometry is an extension of conventional thread technologies such as metric and trapezoidal threads. In contrast to conventional thread geometries, the dryspin® lead screw technology is superior with numerous advantages

Let's take a closer look at these:
In contrast to a metric or trapezoidal thread, the high helix thread has a higher pitch. Thus, a significantly increased linear feed is carried out with one revolution of the lead screw. dryspin® offers better efficiency thanks to the specifications and geometries tailored to the plastic nut and lead screw. Efficiencies of up to 82% and a longer service life are achieved compared to metal lead screw drives. In combination with an igus® lead screw nut, clean and dry operation is possible, without dust and dirt getting stuck.

We tested it!
Our dryspin® lead screw geometry is an excellent alternative to conventional trapezoidal threads. The specifications and geometries of our dryspin® lead screw technology, which are tailored to the iglidur® plastic nut and lead screw, guarantee the well-known advantages: tighter manufacturing tolerances, rounded teeth geometry, optimised flank angle and the asymmetry ideal for plastic nuts compared to DIN 103. Our dimensions are suitable for 1:1 replacement: DS10x2, DS10x3, DS12x3, DS14x4 and DS18x4.

Tighter manufacturing tolerances - improvement by a factor of 3
Trapezoidal threads according to DIN103 (TR18x4) are tolerated with up to -0.3mm on the outside diameter. Excessive radial clearance can lead to noise and vibration. Our dryspin® technology guarantees a maximum tolerance of -0.1mm with the same diameter and identical pitch. We improve the outer diameter tolerance by a factor of three and thus optimise smooth operation and precision, especially at high speeds.

Quiet and vibration-free operation and higher speeds thanks to the rounded tooth flanks of the dryspin® thread geometry
Due to the rounded tooth flanks and tighter manufacturing tolerances of the dryspin® thread geometry, the possible noise-causing contact surface between the lead screw nut and the lead screw is reduced. This is due to the fact that the greater the contact of two surfaces moving against one another, the more vibrations are transmitted, which can be perceived as a rattle or squeak. This means that higher travel speeds can be achieved without causing the corresponding noise.

Up to 30% longer service life - due to thread asymmetry
Due to larger gaps between the individual dryspin® thread pitches, the thread ideally adapts to the specifications of the lubrication-free igus® high-performance polymers. The proportion of the tribologically optimised polymer in the thread turns can be enhanced by a factor of 1.3. More wear-resistant material and higher levels of efficiency are crucial for a service life that is up to 5 times longer compared to standard thread geometries.