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Diaphragm Disc Coupling

The diaphragm disc coupling is a type of metal flexible coupling that offers compensation capabilities for radial, axial, and angular misalignments. Compared to conventional diaphragm couplings, it features a compact design, inherent strong corrosion resistance from the diaphragm disc itself, high load-bearing capacity, lightweight construction, and suitability for higher operating speeds.

Detailed introduction

Product features:
The diaphragm disc coupling is a type of metal flexible coupling that offers compensation capabilities for radial, axial, and angular misalignments. Compared to conventional diaphragm couplings, it features a compact design, inherent strong corrosion resistance from the diaphragm disc itself, high load-bearing capacity, lightweight construction, and suitability for higher operating speeds.

Application scenarios:
Suitable for industries such as compressors, high-speed turbines, fans, and pumps, as well as various high-speed shaft transmission systems used in sectors like petroleum, chemical engineering, and general machinery.

SK3 Series Diaphragm Coupling
Compensates for angular misalignment of up to 1/3°. For applications requiring even smaller overall dimensions, the SK4 or SK5 series are available as options.

SK3 Series Membrane Disc Coupling – Illustrated

Technical Specifications and Main Dimensions of the SK3 Series Diaphragm Couplings

Model	Nominal Torque KN·m	Peak torque KN·m	Instantaneous Torque KN·m	Maximum rotational speed revolutions per minute	Maximum shaft hole d	D	L	H	Moment of inertia kg·m²	Weight Kg	Ability to absorb misalignment
Model	Nominal Torque KN·m	Peak torque KN·m	Instantaneous Torque KN·m	Maximum rotational speed revolutions per minute	mm				Moment of inertia kg·m²	Weight Kg	Axial mm	Angular.
SK388	0.27	0.36	0.48	60000	40	88	50	60	0.002	2.52	0.8	0.33
SK3110	0.62	0.85	1.12	45000	50	110	60	80	0.005	4.71	1.0	0.33
SK3160	2.25	2.96	3.98	32000	75	160	90	115	0.03	12	1.5	0.33
SK3186	4.52	5.95	7.98	28000	95	186	100	140	0.07	19.9	2.0	0.33
SK3238	9.98	13.2	17.5	22000	125	238	140	190	0.28	45	2.5	0.33
SK3285	19.98	26.5	35.2	18000	155	285	180	235	0.75	81.5	3.2	0.33
SK3336	35.6	47	62.5	16000	190	336	200	285	2	140	4.0	0.33
SK3380	49.95	66.4	88.8	14000	215	380	240	325	3.7	202	4.5	0.33
SK3436	79.96	105.8	142.2	12000	250	436	280	380	7.8	320	5.1	0.33
SK3485	112.3	147.5	198.6	11000	280	485	320	425	13.5	432	5.7	0.33
SK3576	200	265.5	352	9000	340	576	390	510	35	750	7.0	0.33
SK3672	224.5	298.6	395.6	6500	400	672	450	600	80	1250	7.8	0.33
SK3835	448.8	598.2	791.3	5000	490	835	550	745	230	2350	9.8	0.33
SK31010	800.2	1058	1397	4000	600	1010	650	910	620	4200	12.0	0.33
SK31165	1398	1856	3272	3600	700	1165	780	1050	1270	6400	14.0	0.33

SK4 Series Diaphragm Coupling
It can compensate for angular misalignment of up to 1/4°. If a smaller overall size is required, opt for the SK5 series; for greater misalignment compensation capability, choose the SK3 series.

Table SK4: Technical Parameters and Main Dimensions of the Membrane Disc Coupling

Model	Nominal Torque KN·m	Peak torque KN·m	Instantaneous Torque KN·m	Maximum rotational speed revolutions per minute	Maximum shaft hole d	D	L	H	Moment of inertia kg·m²	Weight Kg	Ability to absorb misalignment
Model	Nominal Torque KN·m	Peak torque KN·m	Instantaneous Torque KN·m	Maximum rotational speed revolutions per minute	mm				Moment of inertia kg·m²	Weight Kg	Axial mm	Angular.
SK488	0.34	0.45	0.6	60000	40	88	50	60	0.002	2.53	0.6	0.25
SK4110	0.78	1.05	1.41	45000	50	110	60	80	0.005	4.89	0.8	0.25
SK4160	2.78	3.7	4.96	32000	75	160	90	115	0.031	12.8	1.2	0.25
SK4186	5.56	7.48	9.93	28000	95	186	100	140	0.072	20.3	1.5	0.25
SK4238	12.4	16.62	22	22000	125	238	140	190	0.288	46	2.0	0.25
SK4285	25.2	33	44.3	18000	155	285	180	235	0.772	83.2	2.5	0.25
SK4336	44.88	60	79.2	16000	190	336	200	285	2.02	145.7	3.1	0.25
SK4380	62.5	82.5	110	14000	215	380	240	325	3.75	205.4	3.5	0.25
SK4436	98.8	132	176.5	12000	250	436	280	380	7.96	324.1	4.1	0.25
SK4485	140.5	185	248.7	11000	280	485	320	425	13.72	438.6	4.5	0.25
SK4576	249.7	330	440	9000	340	576	390	510	35.61	757.7	5.5	0.25
SK4672	280.2	370	390	6500	400	672	450	600	80.43	1260	6.0	0.25
SK4835	558	745	985	5000	490	835	550	745	231.1	2380	7.6	0.25
SK41010	1118	1332	1966	4000	600	1010	650	910	622.3	4220	9.5	0.25
SK41165	1802	2386	3183	3600	700	1165	780	1050	1283	6420	11.0	0.25

SK5 Series Membrane Disc Coupling
Compensates for angular misalignment of up to 1/5, and if greater compensation capability is required, the SK3 or SK4 series can be selected.

Technical Specifications and Main Dimensions of the SK5 Shaft Coupling with Diaphragm

Model	Nominal Torque KN·m	Peak torque KN·m	Instantaneous Torque KN·m	Maximum rotational speed revolutions per minute	Maximum shaft hole d	D	L	H	Moment of inertia kg·m²	Weight Kg	Ability to absorb misalignment
Model	Nominal Torque KN·m	Peak torque KN·m	Instantaneous Torque KN·m	Maximum rotational speed revolutions per minute	mm				Moment of inertia kg·m²	Weight Kg	Axial mm	Angular.
SK588	0.48	0.65	0.85	60000	40	88	50	60	0.002	2.82	0.4	0.2
SK5110	1.1	1.5	1.95	45000	50	110	60	80	0.006	5.46	0.6	0.2
SK5160	4	5.3	7	32000	75	160	90	115	0.032	13.5	0.8	0.2
SK5186	8	10.5	14	28000	95	186	100	140	0.073	22.1	1.0	0.2
SK5238	17.7	24	32	22000	125	238	140	190	0.289	47.8	1.3	0.2
SK5285	35.2	47.5	61.2	18000	155	285	180	235	0.775	83.3	1.7	0.2
SK5336	62.5	82.8	109.8	16000	190	336	200	285	2.08	147.2	2.1	0.2
SK5380	88.7	120	156	14000	215	380	240	325	3.77	207.5	2.4	0.2
SK5436	140.2	185	245.3	12000	250	436	280	380	7.98	328.6	2.8	0.2
SK5485	198	265	349.7	11000	280	485	320	425	13.85	441.2	3.1	0.2
SK5576	350	470	630.4	9000	340	576	390	510	35.72	761.3	3.8	0.2
SK5672	400	528	705.8	6500	400	672	450	600	80.76	1265	4.2	0.2
SK5835	802	1052	1395	5000	490	835	550	745	232.2	2385	5.3	0.2
SK51010	1610	2119	2803	4000	600	1010	650	910	624.4	4230	6.5	0.2
SK51165	2495	3302	4411	3600	700	1165	780	1050	1288	6450	7.6	0.2

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