Helical Gear — module 1–8 · LH 19°31′42″ · ground

Name: Helical Gear — module 1–8 · LH 19°31′42″ · ground
Brand: Wolfer

Specifications · Selector

Helical gear online selector

All 28 standard sizes from the product catalogue PDF. Filter by module, teeth or bore — or search by model code. All dimensions in mm.

Material 40Cr · Accuracy (JIS Grade 2) DIN 6h25 · Ground teeth · Hardness 45–55 HRC · Helical, left-hand 19°31′42″ · 20° pressure angle · Model code: moduleM-teeth-bore-hand (L = left-hand)

Helical gear construction and designation diagram showing D1, DK, Do, D, L, L1, L2, T, U

Model search

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Bore D1

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Complete size table · 28 sizes (static version for printing and full-text search)

Helical gear online selector (28)
Model Code	Pitch p	Module m	Teeth z	Bore D1 mm	DK mm	Do mm	D mm	L mm	L1 mm	L2 mm	T mm	U mm	Backlash mm
1M-20-12	3.141	1	20	12	23.22	21.22	18	20	5	15	13.8	4	0.08~0.16
1M-25-12	3.141	1	25	12	28.53	26.53	20	20	5	15	13.8	4	0.08~0.16
1M-30-15	3.141	1	30	15	33.83	31.83	30	20	5	15	16.8	5	0.08~0.16
1M-35-15	3.141	1	35	15	39.14	37.14	35	20	5	15	17.3	5	0.08~0.16
1.5M-21-16	4.712	1.5	21	16	36.42	33.423	30	46	26	20	18.3	5	0.08~0.16
1.5M-30-22	4.712	1.5	30	22	50.75	47.747	36	48	28	20	24.8	6	0.08~0.16
1.5M-39-22	4.712	1.5	39	22	65.07	62.071	36	48	28	20	24.8	6	0.10~0.18
2M-21-22	6.283	2	21	22	48.56	44.563	36	56	28	28	24.8	6	0.10~0.20
2M-30-22	6.283	2	30	22	67.66	63.662	36	56	28	28	24.8	6	0.12~0.22
2M-30-32	6.283	2	30	32	67.66	63.662	55	65	37	28	35.3	10	0.12~0.22
2M-39-32	6.283	2	39	32	86.76	82.761	55	65	37	28	35.3	10	0.12~0.22
2.5M-20-22	7.854	2.5	20	22	58.05	53.052	36	56	28	28	24.8	6	0.10~0.20
2.5M-25-22	7.854	2.5	25	22	71.31	66.315	36	56	28	28	24.8	6	0.12~0.22
2.5M-25-32	7.854	2.5	25	32	71.31	66.315	55	65	37	28	35.3	10	0.12~0.22
3M-20-22	9.425	3	20	22	69.66	63.662	36	56	28	28	24.8	6	0.12~0.22
3M-20-32	9.425	3	20	32	69.66	63.662	55	65	37	28	35.3	10	0.12~0.22
3M-25-22	9.425	3	25	22	85.58	79.578	36	56	28	28	24.8	6	0.12~0.22
3M-25-32	9.425	3	25	32	85.58	79.578	55	65	37	28	35.3	10	0.12~0.22
4M-18-32	12.566	4	18	32	84.39	76.395	55	75	35	40	35.3	10	0.14~0.24
4M-21-32	12.566	4	21	32	97.13	89.127	55	75	35	40	35.3	10	0.14~0.24
4M-21-35	12.566	4	21	35	97.13	89.127	55	75	35	40	38.3	10	0.14~0.24
4M-24-32	12.566	4	24	32	109.86	101.859	55	75	35	40	35.3	10	0.14~0.24
4M-24-35	12.566	4	24	35	109.86	101.859	55	75	35	40	38.3	10	0.14~0.24
5M-18-45	15.708	5	18	45	105.49	95.493	68	85	35	50	48.8	14	0.14~0.24
5M-24-45	15.708	5	24	45	137.32	127.324	68	85	35	50	48.8	14	0.16~0.26
6M-20-55	18.85	6	20	55	139.32	127.324	80	100	40	60	59.3	16	0.16~0.26
6M-25-75	18.85	6	25	75	171.16	159.155	110	120	60	60	79.9	20	0.16~0.26
8M-18-75	25.133	8	18	75	168.79	152.789	110	140	60	80	79.9	20	0.18~0.28

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. Source: Wolfer helical gear catalogue. Download PDF catalogue ↗

FAQ

Common questions about this series

Helical Gears: what size range does the table cover?

The table on this page lists 28 standard sizes: module 1–8, 18–39 teeth, bores from Ø12 to Ø75 mm. Sizes outside this range are made to your drawing.

Helical Gears: what is it and when should I use it?

Ground gears, module 1–8. Helical gear · 19°31'42" left-hand · ground · 20° pressure angle. Helical gears run quieter and carry more load than spur gears of the same size because several teeth are in mesh at once; the trade-off is an axial thrust that the bearings must take. Use them for higher-speed or noise-sensitive parallel-shaft drives, and match the hand (left/right) of the mating gear.

Helical Gears: 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.

Helical Gears: what do I need to send to get a quote?

Send the drawing or these values: module (or DP), number of teeth, pressure angle, helix angle and hand (for helical), face width, bore with tolerance and keyway, hub dimensions, material and heat treatment, required accuracy class (ISO 1328 / DIN / AGMA / JIS) and quantity. A STEP file plus a 2D drawing with critical tolerances is ideal; a photo of the old part with basic measurements is enough for a first quote.

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