Jaw / Spider Couplings: what size range does the table cover?

This page covers 7 series (JM1, JM2, JM3, JM4, WF, ROTEX, LM) with 84 catalogue sizes: bores from Ø2 to Ø160 mm, rated torque 1.4–25 000 N·m. Finished bores, keyways and clamp variants are machined to your shaft; sizes outside the tables are made to drawing.

Jaw / Spider Couplings: what is it and when should I use it?

Two hubs + an elastomer spider: damping, simple construction, easy mounting; the spider is replaceable (Shore A 80 / 92 / 98). JM is the zero-backlash servo series, LM the GB/T 5272 general series. Use a jaw coupling where you want damping and simple, forgiving mounting on servo, pump and general motor drives: the JM zero-backlash series with pre-loaded spider (Shore A 80/92/98 to tune stiffness) for positioning axes, the LM (GB/T 5272) series for general drives. Not for large radial offset — use an Oldham or disc coupling there.

Jaw / Spider Couplings: 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.

Jaw / Spider Couplings: what do I need to send to get a quote?

Send: shaft diameters and lengths on both sides (with keyways or clamp preference), rated and peak torque, speed, the misalignment you expect (angular, radial, axial), space available (outside diameter and overall length), operating temperature and whether the drive is servo/positioning or general. A drawing or STEP of the two shaft ends is ideal; a sketch with these values is enough for a first quote.

JM / LM Jaw Couplings

Coupling Selector · Specifications

JM / LM Jaw Couplings selector

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JM1 Series dimensional drawing — JM1 Series · Engineering drawing · PDF page 1

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Data table

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Complete size table · 181 sizes (static version for printing and full-text search)

JM1 Series · JM1 Dimensions
Model	Minimum bore dmin · mm	Maximum bore dmax · mm	Outside diameter D · mm	Overall length L · mm	L1 dimension L1 · mm	L2 dimension L2 · mm	L3 dimension L3 · mm	Set screw M	Tightening torque N·m
JM1-16	2	7	16	22	7	5	3.5	M2.5	1
JM1-20	4	10	20	30	10	8	5	M3	1.3
JM1-25	4	12	25	34	11	12	5	M4	1.3
JM1-30	6	16	30	35	11	13	5	M4	1.7
JM1-40	10	24	40	66	25	16	10	M5	8
JM1-55	12	28	55	78	30	18	10.5	M6	8
JM1-65	14	38	65	90	35	20	11.5	M8	15

JM1 Series · JM1 performance data
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia kg·m²	Static torsional stiffness N·m/rad	Radial deviation mm	Angular deviation °	Axial deviation mm	Mass g
JM1-16	1.4	2.8	27000	0.09×10^-6	14.8	0.015	0.7	+0.4/0	9
JM1-20	3	6	26000	0.49×10^-6	31.5	0.02	1	+0.6/0	19.8
JM1-25	5	10	17000	6.7×10^-4	55	0.02	1	+0.6/0	37
JM1-30	7.4	14.8	15000	8.5×10^-4	72	0.02	1	+0.6/0	46
JM1-40	9.5	19	13000	1.1×10^-3	550	0.02	1	+0.8/0	148
JM1-55	34	68	10500	4.4×10^-3	1500	0.02	1	+0.8/0	350
JM1-65	95	190	8300	9.0×10^-3	2800	0.02	1	+0.8/0	572

JM2 jaw coupling · JM2 dimensions
Model	Minimum finished bore mm	Maximum finished bore mm	D D · mm	L L · mm	L1 L1 · mm	L2 L2 · mm	L3 L3 · mm	Thread	Tightening torque N·m
JM2-16	2	7	16	22	7	5	3.5	M2.5	1
JM2-20	4	10	20	30	10	8	5	M3	1.3
JM2-25	4	12	25	34	11	12	5	M4	1.3
JM2-30	6	16	30	35	11	13	5	M4	1.7
JM2-40	10	24	40	66	25	16	10	M5	8
JM2-55	12	28	55	78	30	18	10.5	M6	8
JM2-65	14	38	65	90	35	20	11.5	M8	15
JM2-80	24	45	80	114	45	24	15.5	M8	15
JM2-95	30	55	95	126	50	26	18	M10	25
JM2-105	35	60	105	140	56	28	21	M12	35

JM2 jaw coupling · JM2 performance data
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia kg·m²	Static torsional stiffness N·m/rad	Radial deviation mm	Angular deviation °	Axial deviation mm	Mass g
JM2-16	1.4	2.8	24700	0.09×10^-6	14.8	0.015	0.7	+0.4/0	9
JM2-20	3	6	25500	0.49×10^-6	31.5	0.02	1	+0.6/0	19.8
JM2-25	5	10	17000	6.7×10^-4	55	0.02	1	+0.6/0	37
JM2-30	7.4	14.8	12000	8.5×10^-4	72	0.02	1	+0.6/0	50
JM2-40	9.5	19	10000	1.1×10^-3	550	0.02	1	+0.8/0	156
JM2-55	34	68	8000	4.4×10^-3	1500	0.02	1	+0.8/0	362
JM2-65	95	190	6000	9.0×10^-3	2800	0.02	1	+0.8/0	582
JM2-80	135	270	4600	1.8×10^-2	3500	0.02	1	+1.0/0	966
JM2-95	230	460	3800	2.0×10^-2	4600	0.02	1	+1.0/0	1820
JM2-105	380	760	3400	3.2×10^-2	5800	0.02	1	+1.0/0	2430

JM3 clamping jaw coupling · JM3 dimensions
Model	Minimum finished bore mm	Maximum finished bore mm	D D · mm	L L · mm	L1 L1 · mm	L2 L2 · mm	Thread	Tightening torque N·m
JM3-30	8	14	30	50	18.5	10	M3	1.34
JM3-40	11	20	40	66	25	12	M4	3
JM3-55	14	28	55	78	30	14	M5	6
JM3-65	19	38	65	90	35	15	M5	6
JM3-80	24	45	80	114	45	18	M6	10
JM3-95	30	50	95	126	50	20	M8	25
JM3-105	35	60	105	140	56	21	M10	49

JM3 clamping jaw coupling · JM3 performance data
Model	Rated torque N·m	Maximum torque N·m	Maximum speed rpm	Moment of inertia kg·m²	Radial deviation mm	Angular deviation °	Axial deviation mm	Mass g
JM3-30	7.5	15	20000	8.4×10^-4	0.02	1	+0.60/0	50
JM3-40	10	20	15000	1.12×10^-3	0.02	1	+0.80/0	120
JM3-55	35	70	13000	4.5×10^-3	0.02	1	+0.80/0	280
JM3-65	95	190	10500	9.1×10^-3	0.02	1	+0.80/0	450
JM3-80	190	380	8500	1.9×10^-2	0.02	1	+1.00/0	960
JM3-95	265	530	7500	2.2×10^-2	0.02	1	+1.00/0	2310
JM3-105	310	620	6000	3.3×10^-2	0.02	1	+1.00/0	3090

JM4 Series · JM4 Dimensions
Model	d1 minimum bore d1 min · mm	d1 maximum bore d1 max · mm	d2 minimum bore d2 min · mm	d2 maximum bore d2 max · mm	Outside diameter D · mm	Overall length L · mm	L1 / L2 L1/L2 · mm	L3 dimension L3 · mm	F dimension F · mm	E dimension E · mm	B dimension B · mm	C dimension C · mm	R dimension R · mm	DK dimension DK · mm	Set screw M	Tightening torque N·m
JM4-20	4	10	4	10	20	45	10	25	5	10	8	1	1.2	24	M3	1.5
JM4-25	4	12	4	12	25	52	11	30	5	12	10	1	2	26.5	M3	1.5
JM4-30	5	16	5	16	30	56	11	34	5	13	10	1.5	2	31.4	M3	1.5
JM4-40	6	24	6	24	40	92	25	42	12	16	12	2	4	47	M6	8
JM4-55	8	28	8	28	55	112	30	52	10.5	18	14	2	4	60	M6	8
JM4-65	10	38	10	38	65	128	35	58	11.5	20	15	2.5	4	72	M8	16
JM4-80	12	45	12	45	80	158	45	68	15.5	24	18	3	4	80	M8	16

WF steel jaw coupling · WF steel series principal dimensions
Model	Component type	Maximum finished bore mm	L L · mm	l1_l2 l1_l2 · mm	E E · mm	b b · mm	s s · mm	DH DH · mm	dH dH · mm	D D · mm	N N · mm	Set screw	t dimension mm	Tightening torque N·m
WF14	1a	16	35	11	13	10	1.5	29	10	29	—	M4	5	1.5
WF19	1	18	66	25	16	12	2	39	18	32	20	M5	10	2
WF19	1a	25	66	25	16	12	2	39	18	39	—	M5	10	2
WF24	1	27	78	30	18	14	2	54	27	40	24	M5	10	2
WF24	1a	35	78	30	18	14	2	54	27	54	—	M5	10	2
WF28	1	30	90	35	20	15	2.5	64	30	48	27.5	M8	15	10
WF28	1a	40	90	35	20	15	2.5	64	30	64	—	M8	15	10
WF38	1	42	114	45	24	18	3	79	38	66	27	M8	15	10
WF38	1a	48	114	45	24	18	3	79	38	79	—	M8	15	10
WF42	1	46	126	50	26	20	3	94	46	85	28	M8	20	10
WF42	1a	55	126	50	26	20	3	94	46	94	—	M8	20	10
WF48	1	51	140	56	28	21	3.5	104	51	95	32	M8	20	10
WF48	1a	62	140	56	28	21	3.5	104	51	104	—	M8	20	10
WF55	1	60	160	65	30	22	4	119	60	110	37	M10	20	17
WF55	1a	74	160	65	30	22	4	119	60	119	—	M10	20	17
WF65	1	68	185	75	35	26	4.5	134	68	115	47	M10	20	17
WF65	1b	80	235	100	35	26	4.5	134	68	134	—	M10	20	17
WF75	1	80	210	85	40	30	5	159	80	135	53	M10	25	17
WF75	1b	95	260	110	40	30	5	159	80	159	—	M10	25	17
WF90	1	100	245	100	45	34	5.5	199	100	160	62	M12	30	40
WF90	1b	110	295	125	45	34	5.5	199	100	199	—	M12	30	40

WF steel jaw coupling · WF steel series spider torque ratings
Model	92ShA rated torque N·m	98ShA rated torque N·m	64ShD rated torque N·m
WF14	7.5	12.5	16
WF19	10	17	21
WF24	35	60	75
WF28	95	160	200
WF38	190	325	405
WF42	265	450	560
WF48	310	525	655
WF55	410	685	825
WF65	625	940	1175
WF75	1280	1920	2400
WF90	2400	3600	4500

WF taper-bush jaw coupling · WF taper-bush principal dimensions
Model	TB bush size	l1_l2 l1_l2 · mm	E E · mm	s s · mm	b b · mm	L L · mm	N N · mm	DH DH · mm	D1 D1 · mm	dH dH · mm	Installation screw size in	Screw length mm	Screw quantity	Tightening torque N·m
WF24	1008	23	18	2	14	64	—	55	55	27	1/4	13	2	5.7
WF28	1108	23	20	2.5	15	66	—	65	65	30	1/4	13	2	5.7
WF38	1108	23	24	3	18	70	15	80	78	38	1/4	13	2	5.7
WF42	1610	26	26	3	20	78	16	95	94	46	3/8	16	2	20
WF48	1615	39	28	3.5	21	106	28	105	104	51	3/8	16	2	20
WF55	2012	33	30	4	22	96	20	120	118	60	7/16	22	2	31
WF65	2012	33	35	4.5	26	101	19	135	115	68	7/16	22	2	31
WF75	2517	52	40	5	30	144	36	160	158	80	1/2	25	2	49
WF75	3020	52	40	5	30	144	36	160	158	80	5/8	32	2	92
WF90	3020	52	45	5.5	34	149	33	200	160	100	5/8	32	2	92
WF100	3535	90	50	6	38	230	69	225	180	113	1/2	49	3	113
WF125	4545	114	60	7	46	288	86	230	290	147	3/4	49	3	192

WF taper-bush jaw coupling · TB bush finished bore availability
TB bush size	Available finished bores d H7 · mm
1008	10,11,12,14,16,18,19,20,22,24,25
1108	10,11,12,14,16,18,19,20,22,24,25,28
1610	14,16,18,19,20,22,24,25,28,30,32,35,38,40,42
1615	14,16,18,19,20,22,24,25,28,30,32,35,38,40,42
2012	14,16,18,19,20,22,24,25,28,30,32,35,38,40,42,45,48,50
2517	16,18,19,20,22,24,25,28,30,32,35,38,40,42,45,48,50,55,60
3020	25,28,30,35,38,40,42,45,48,50,55,60,65,70,75
3535	35,38,40,42,45,48,50,55,60,65,70,75,80,85,90
4545	55,60,65,70,75,80,85,90,95,100,105,110

ROTEX Elastomers · ROTEX Misalignment Performance
Model	Axial misalignment (negative limit) ΔKa · mm	Axial misalignment (positive limit) ΔKa · mm	Radial misalignment at 1500 rpm ΔKr · mm	Angular misalignment at 1500 rpm ΔKw · °	Angular offset ΔKw · mm
14	-0.5	1	0.17	1.2	0.67
19	-0.5	1.2	0.2	1.2	0.82
24	-0.5	1.4	0.22	0.9	0.85
28	-0.7	1.5	0.25	0.9	1.05
38	-0.7	1.8	0.28	1	1.35
42	-1	2	0.32	1	1.7
48	-1	2.1	0.36	1.1	2
55	-1	2.2	0.38	1.1	2.3
65	-1	2.6	0.42	1.2	2.7
75	-1.5	3	0.48	1.2	3.3
90	-1.5	3.4	0.5	1.2	4.3
100	-1.5	3.8	0.52	1.2	4.8
110	-2	4.2	0.55	1.3	5.6
125	-2	4.6	0.6	1.3	6.5
140	-2	5	0.62	1.2	6.6
160	-2.5	5.7	0.64	1.2	7.6
180	-3	6.4	0.68	1.2	9

LM jaw coupling · LM principal dimensions
Model	Former model	Bore group mm	Y bore length mm	J/J1/Z bore length mm	Recommended length L · mm	Overall length L0 · mm	Outside diameter D · mm	Elastic element
LM1	ML1	12,14	32	27	35	86	50	MT0
LM1	ML1	16,18,19	42	30	35	86	50	MT0
LM1	ML1	20,22,24	52	38	35	86	50	MT0
LM1	ML1	25	62	44	35	86	50	MT0
LM2	—	16,18,19	42	30	38	95	60	MT1
LM2	—	20,22,24	52	38	38	95	60	MT1
LM2	—	25,28	62	44	38	95	60	MT1
LM2	—	30	82	60	38	95	60	MT1
LM3	ML2	20,22,24	52	38	40	103	70	MT2
LM3	ML2	25,28	62	44	40	103	70	MT2
LM3	ML2	30,32	82	60	40	103	70	MT2
LM4	ML3	22,24	52	38	45	114	85	MT3
LM4	ML3	25,28	62	44	45	114	85	MT3
LM4	ML3	30,32,35,38	82	60	45	114	85	MT3
LM4	ML3	40	112	84	45	114	85	MT3
LM5	ML4	25,28	62	44	50	127	105	MT4-D100
LM5	ML4	30,32,35,38	82	60	50	127	105	MT4-D100
LM5	ML4	40,42,45	112	84	50	127	105	MT4-D100
LM6	ML5	30,32,35,38	82	60	55	143	125	MT5-122
LM6	ML5	40,42,45,48	112	84	55	143	125	MT5-122
LM7	ML6	35,38	82	60	60	159	145	MT6-140
LM7	ML6	40,42,45,48,50,55	112	84	60	159	145	MT6-140
LM8	ML7	45,48,50,55,56	112	84	70	181	170	MT7-166
LM8	ML7	60,63,65*	142	107	70	181	170	MT7-166
LM9	ML8	50,55,56*	112	84	80	208	200	MT8-196
LM9	ML8	60,63,65,70,71,75	142	107	80	208	200	MT8-196
LM9	ML8	80	172	132	80	208	200	MT8-196
LM10	ML9	60,63,65*,70,71,75	142	107	90	230	230	MT9
LM10	ML9	80,85,90,95	172	132	90	230	230	MT9
LM10	ML9	100	212	167	90	230	230	MT9
LM11	ML10	70,71,75*	142	107	100	260	265	MT10
LM11	ML10	80,85,90,95	172	132	100	260	265	MT10
LM11	ML10	100,110,120	212	167	100	260	265	MT10
LM12	ML11	80,85,90,95	172	132	115	297	300	MT11
LM12	ML11	100,110,120,125	212	167	115	297	300	MT11
LM12	ML11	130	252	202	115	297	300	MT11
LM13	ML12	90,95	172	132	125	323	360	MT12
LM13	ML12	100,110,120,125	212	167	125	323	360	MT12
LM13	ML12	130,140,150	252	202	125	323	360	MT12
LM14	ML13	100,110,120,125	212	167	135	333	400	MT13
LM14	ML13	130,140,150	252	202	135	333	400	MT13
LM14	ML13	160	302	242	135	333	400	MT13

LM jaw coupling · LM performance data
Model	Nominal torque with HA 80±5 spider N·m	Nominal torque with HD 60±5 spider N·m	Allowable speed rpm	Mass kg	Rotational inertia kg·m²
LM1	25	45	15300	0.66	0.0002
LM2	50	100	12000	0.93	0.0004
LM3	100	200	10900	1.41	0.0009
LM4	140	280	9000	2.18	0.002
LM5	350	400	7300	3.6	0.005
LM6	400	710	6100	6.07	0.0114
LM7	630	1120	5300	9.09	0.0232
LM8	1120	2240	4500	13.56	0.0468
LM9	1800	3550	3800	21.4	0.1041
LM10	2800	5600	3300	32.03	0.2105
LM11	4500	9000	2900	49.52	0.4338
LM12	6300	12500	2500	73.45	0.8205
LM13	11200	20000	2100	103.86	1.6718
LM14	12500	25000	1900	127.59	2.499

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.

Dimensions and performance are shown separately. Sort by any column; consult the PDF catalogue for the full range, tolerances, and operating conditions. Download PDF catalogue ↗

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Jaw / Spider Couplings

JM / LM Jaw Couplings selector

Common questions about this series

Jaw / Spider Couplings: what size range does the table cover?

Jaw / Spider Couplings: what is it and when should I use it?

Jaw / Spider Couplings: can I order a size that is not in the table, or just one piece?

Jaw / Spider Couplings: what do I need to send to get a quote?