PRODUCT · Linear Motion
Ground helical rack
Helical racks · RH 19°31′42″ · ground teeth · 20° pressure angle; smooth, quiet and high-capacity — for high-speed gantries and heavy-load precision linear drives.
Last updated Reviewed by Luo Genwen, Production Plant Manager
Specifications · Selector
Ground helical rack selector
All 34 standard sizes from the catalogue PDF. Search by code or filter by module and length. All dimensions in mm.
Complete size table · 34 sizes (static version for printing and full-text search)
| Code | Module M | Length L | L1 | Teeth z | b | hk | h0 | A | L3 | Holes n | h | d1 | d2 | t | A1 | L2 | d3 | Pitch err /300mm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 11 010 050 | 1 | 500 | 5.3 | 150 | 15 | 15 | 14 | 62.5 | 125 | 4 | 6 | 4.5 | 8 | 5 | 31.7 | 436.6 | 5.7 | 0.022 |
| 12 11 010 100 | 1 | 1000 | 5.3 | 300 | 15 | 15 | 14 | 62.5 | 125 | 8 | 6 | 4.5 | 8 | 5 | 31.7 | 936.6 | 5.7 | 0.022 |
| 12 11 015 015 | 1.5 | 500 | 6 | 100 | 17 | 17 | 15.5 | 62.5 | 125 | 4 | 7 | 6.3 | 10 | 7 | 31.7 | 436.6 | 5.7 | 0.022 |
| 12 11 015 100 | 1.5 | 1000 | 6 | 200 | 17 | 17 | 15.5 | 62.5 | 125 | 8 | 7 | 6.3 | 10 | 7 | 31.7 | 936.6 | 5.7 | 0.022 |
| 12 11 020 050 | 2 | 500 | 8.5 | 75 | 24 | 24 | 22 | 62.5 | 125 | 4 | 8 | 7.5 | 11.5 | 7 | 31.7 | 436.6 | 5.7 | 0.022 |
| 12 11 020 100 | 2 | 1000 | 8.5 | 150 | 24 | 24 | 22 | 62.5 | 125 | 8 | 8 | 7.5 | 11.5 | 7 | 31.7 | 936.6 | 5.7 | 0.022 |
| 12 11 030 050 | 3 | 500 | 10.3 | 50 | 29 | 29 | 26 | 62.5 | 125 | 4 | 9 | 10 | 15 | 9 | 35 | 430 | 7.7 | 0.024 |
| 12 11 030 100 | 3 | 1000 | 10.3 | 100 | 29 | 29 | 26 | 62.5 | 125 | 8 | 9 | 10 | 15 | 9 | 35 | 930 | 7.7 | 0.024 |
| 12 11 040 050 | 4 | 506.67 | 13.8 | 38 | 39 | 39 | 35 | 62.5 | 125 | 4 | 12 | 10 | 15 | 9 | 33.3 | 433 | 7.7 | 0.025 |
| 12 11 040 100 | 4 | 1000 | 13.8 | 75 | 39 | 39 | 35 | 62.5 | 125 | 8 | 12 | 10 | 15 | 9 | 33.3 | 933.4 | 7.7 | 0.025 |
| 12 11 050 050 | 5 | 500 | 17.4 | 30 | 49 | 39 | 34 | 62.5 | 125 | 4 | 12 | 14 | 20 | 13 | 37.5 | 425 | 11.7 | 0.025 |
| 12 11 050 100 | 5 | 1000 | 17.4 | 60 | 49 | 39 | 34 | 62.5 | 125 | 8 | 12 | 14 | 20 | 13 | 37.5 | 925 | 11.7 | 0.025 |
| 12 11 060 050 | 6 | 500 | 20.9 | 25 | 59 | 49 | 43 | 62.5 | 125 | 4 | 16 | 18 | 26 | 17 | 37.5 | 425 | 15.7 | 0.026 |
| 12 11 060 100 | 6 | 1000 | 20.9 | 50 | 59 | 49 | 43 | 62.5 | 125 | 8 | 16 | 18 | 26 | 17 | 37.5 | 925 | 15.7 | 0.026 |
| 12 11 080 050 | 8 | 480 | 28 | 18 | 79 | 79 | 71 | 60 | 120 | 4 | 25 | 22 | 33 | 21 | 120 | 240 | 19.7 | 0.027 |
| 12 11 080 100 | 8 | 960 | 28 | 36 | 79 | 79 | 71 | 60 | 120 | 8 | 25 | 22 | 33 | 21 | 120 | 720 | 19.7 | 0.027 |
| 12 11 100 100 | 10 | 1000 | 35.11 | 30 | 99 | 99 | 89 | 62.5 | 125 | 8 | 32 | 33 | 48 | 32 | 125 | 750 | 19.7 | 0.028 |
| 22 11 010 050 | 1 | 500 | 5.3 | 150 | 15 | 15 | 14 | 62.5 | 125 | 4 | 6 | 4.5 | 8 | 5 | 31.7 | 436.6 | 5.7 | 0.022 |
| 22 11 010 100 | 1 | 1000 | 5.3 | 300 | 15 | 15 | 14 | 62.5 | 125 | 8 | 6 | 4.5 | 8 | 5 | 31.7 | 936.6 | 5.7 | 0.022 |
| 22 11 015 015 | 1.5 | 500 | 6 | 100 | 17 | 17 | 15.5 | 62.5 | 125 | 4 | 7 | 6.3 | 10 | 7 | 31.7 | 436.6 | 5.7 | 0.022 |
| 22 11 015 100 | 1.5 | 1000 | 6 | 200 | 17 | 17 | 15.5 | 62.5 | 125 | 8 | 7 | 6.3 | 10 | 7 | 31.7 | 936.6 | 5.7 | 0.022 |
| 22 11 020 050 | 2 | 500 | 8.5 | 75 | 24 | 24 | 22 | 62.5 | 125 | 4 | 8 | 7.5 | 11.5 | 7 | 31.7 | 436.6 | 5.7 | 0.022 |
| 22 11 020 100 | 2 | 1000 | 8.5 | 150 | 24 | 24 | 22 | 62.5 | 125 | 8 | 8 | 7.5 | 11.5 | 7 | 31.7 | 936.6 | 5.7 | 0.022 |
| 22 11 030 050 | 3 | 500 | 10.3 | 50 | 29 | 29 | 26 | 62.5 | 125 | 4 | 9 | 10 | 15 | 9 | 35 | 430 | 7.7 | 0.024 |
| 22 11 030 100 | 3 | 1000 | 10.3 | 100 | 29 | 29 | 26 | 62.5 | 125 | 8 | 9 | 10 | 15 | 9 | 35 | 930 | 7.7 | 0.024 |
| 22 11 040 050 | 4 | 506.67 | 13.8 | 38 | 39 | 39 | 35 | 62.5 | 125 | 4 | 12 | 10 | 15 | 9 | 33.3 | 433 | 7.7 | 0.025 |
| 22 11 040 100 | 4 | 1000 | 13.8 | 75 | 39 | 39 | 35 | 62.5 | 125 | 8 | 12 | 10 | 15 | 9 | 33.3 | 933.4 | 7.7 | 0.025 |
| 22 11 050 050 | 5 | 500 | 17.4 | 30 | 49 | 39 | 34 | 62.5 | 125 | 4 | 12 | 14 | 20 | 13 | 37.5 | 425 | 11.7 | 0.025 |
| 22 11 050 100 | 5 | 1000 | 17.4 | 60 | 49 | 39 | 34 | 62.5 | 125 | 8 | 12 | 14 | 20 | 13 | 37.5 | 925 | 11.7 | 0.025 |
| 22 11 060 050 | 6 | 500 | 20.9 | 25 | 59 | 49 | 43 | 62.5 | 125 | 4 | 16 | 18 | 26 | 17 | 37.5 | 425 | 15.7 | 0.026 |
| 22 11 060 100 | 6 | 1000 | 20.9 | 50 | 59 | 49 | 43 | 62.5 | 125 | 8 | 16 | 18 | 26 | 17 | 37.5 | 925 | 15.7 | 0.026 |
| 22 11 080 050 | 8 | 480 | 28 | 18 | 79 | 79 | 71 | 60 | 120 | 4 | 25 | 22 | 33 | 21 | 120 | 240 | 19.7 | 0.027 |
| 22 11 080 100 | 8 | 960 | 28 | 36 | 79 | 79 | 71 | 60 | 120 | 8 | 25 | 22 | 33 | 21 | 120 | 720 | 19.7 | 0.027 |
| 22 11 100 100 | 10 | 1000 | 35.11 | 30 | 99 | 99 | 89 | 62.5 | 125 | 8 | 32 | 33 | 48 | 32 | 125 | 750 | 19.7 | 0.028 |
Static copy of the selector data for reference and printing; use the interactive selector above to filter, sort and request a quote. All dimensions in mm; full range and tolerances per the PDF catalogue.
Click a column header to sort. Racks butt-joint to any length. Dimensions in mm. Source: Wolfer gear-rack catalogue. Download PDF catalogue ↗
FAQ
Common questions about this series
Ground helical rack: what size range does the table cover?
The table lists 34 standard racks: module 1–10, standard lengths 480 / 500 / 507 / 960 / 1000 mm (18–300 teeth per piece). Racks can be butt-jointed end to end for longer travel; other modules, lengths and mounting-hole patterns are made to drawing.
Ground helical rack: what is it and when should I use it?
Helical racks · RH 19°31′42″ · ground teeth · 20° pressure angle; smooth, quiet and high-capacity — for high-speed gantries and heavy-load precision linear drives. Choose ground racks (Grade 6, induction hardened HRC 50–55) for laser gantries, CNC axes and any drive where positioning accuracy and long life matter; milled racks (about Grade 7) are the economical option for medium-accuracy automation and conveying. Helical teeth run smoother at speeds above roughly 60 m/min and carry about 30% more load per face width, at the cost of axial thrust on the pinion bearings.
Ground helical rack: can I order a size that is not in the table, or just one piece?
Yes. Everything on this page is made to drawing, and the table is only the standard-size subset of the catalogue. Minimum order quantity is one piece — we routinely make single replacement parts for OEMs whose original supplier has discontinued the item. Send a DWG, STEP or PDF drawing (or a sample part): you get a formal quotation within 24 hours after the information is complete, and the first article ships within 30 days of drawing approval, with inspection records.
Ground helical rack: what do I need to send to get a quote?
Send the drawing or: module, straight or helical (with helix angle), length and number of teeth, cross-section (height × width), mounting-hole pattern, accuracy class and hardening requirement, whether ends must be matched for jointing, and quantity. Tell us the pinion you use so pitch and profile match.