Expansion of dryspin® lead screw nuts

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-1812DS10x20	DS10x20	10	22	-	-	-	20	-	-
Cylindrical lead screw nuts	DST-□SLM-2220DS12.7x10	DS12.7x10	12.7	xx	-	-	-	xx	-	-
Cylindrical lead screw nuts	DST-□SLM-4540DS25x5	DS25x5	25	45	-	-	-	40	-	-
Cylindrical lead screw nut with spanner flat	DST-□SLM-172220DS10x20	DS10x20	10	22	-	-	-	20	-	17
Cylindrical lead screw nut with spanner flat	DST-□SLM-172220DS12.7x10	DS12.7x10	12.7	26	-	-	-	24	-	19
Cylindrical lead screw nut with spanner flat	DST-□SLM-304540DS25x5	DS20x50	25	50	-	-	-	36	-	36
Flange lead screw nut	DST-□FRM-2020DS10x20	DS10x20	10	25	42	34	5	25	10	-
Flange lead screw nut	DST-□FLM-2525DS12.7x10	DS12.7x10	12.7	28	48	38	6	35	12	-
Flange lead screw nut	DST-□FLM-3244DS25x5	DS25x5	25	32	55	45	7	44	12	-
Flange lead screw nut with spanner flat	DST-□FRM-202020DS10x20	DS10x20	10	25	42	34	5	25	10	25
Flange lead screw nut with spanner flat	DST-□FLM-252525DS12.7x10	DS12.7x10	12.7	28	48	38	6	35	12	28
Flange lead screw nut with spanner flat	DST-□FLM-323244DS25x5	DS25x5	25	32	55	45	7	44	12	32

□ = Information about other materials and dimensions is available here

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 was 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 range includes (high-helix) lead screws made of stainless steel or aluminium and the suitable lead screw nuts made of igus® high-performance polymers. They are available with pitches from 1mm to 100mm. The dryspin® thread geometry is an extension of conventional thread technologies, such as metric and trapezoidal threads. dryspin® lead screw technology has many advantages over conventional lead screw geometries.How can I find out the thread direction of my lead screw?
Whether the direction of a thread rotation is right or left can be easily determined with a visual inspection. If you look at the lead screw from the front, you can best see the difference between left-hand and right-hand threads.  For lead screws with right-hand thread, the thread flanks rise from bottom left to top right. In production drawings, right-hand threads are often marked with the letters RH, e.g. DS10x20-RH. More information.

Self-locking - what does that mean?
Self-locking means that lead screw nuts and lead screws cannot be moved without the application of external force. As soon as the static friction is exceeded, the components are no longer self-locking. Multistart trapezoidal screw drives have a "residual self-locking" feature; high helix screw drives have no self-locking feature. Since the self-locking depends both on the pitch angle and on the coefficient of friction of the sliding pair, a loss of self-locking can occur with very low coefficients of friction even with single start trapezoidal threads. More information. 

Quiet and vibration-free operation and higher speeds
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. The reason for this is 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 pitches 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 five times longer compared to standard thread geometries. More information.

Can I lubricate my plastic lead screw?
It is no secret that igus® is an advocate of non-lubrication of bearings. Simply put, lubrication is not required for igus® products. Many people think that greasing some products is essential to guarantee that they do not seize up and ensure smooth movement. However, it is easy to forget that lubrication is not a prerequisite for all products. No lubrication is required for igus® lead screw nuts; however, it can still be used. It is essential to check the resistance to the lubricants that will be used.