Ground Helical Rack

Name: Ground Helical Rack
Brand: Wolfer

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 2026-09-12 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.

Helical rack · 19°31′42″ RH · ground · 20° pressure angle · smooth, quiet, high load capacity · module 1–10 · standard length 500 / 1000 mm (butt-jointable) · for high-speed gantries & heavy precision drives

Model search

Module

Length L

–

Complete size table · 34 sizes (static version for printing and full-text search)

Ground helical rack selector (34)
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.

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