Contoured Flexible Diaphragm Couplings

Our Design

The Diaphragm Coupling offers several advantages, with its modular bolted and splined design standing out as a key benefit. This design permits the easy replacement of the diaphragm without the need for a complete coupling replacement. Additionally, the weld-free construction of the coupling eliminates any concerns related to material degradation in the weld zone. Furthermore, this coupling excels in maintaining exceptional balance repeatability.

Available Configurations

Low speed and high speed applications

Reduced Moment Design

Custom engineered to accommodate torque management devices

Custom Features

In the event that you have a need for a custom application, Riverhawk’s engineering staff can offer expertise specific to:

Electrical Isolation
Torque Transient Protection
Backup Drive
Torque Measurement

Coupling Sizes

Capabilities shown below reflect API 671 requirements and guidelines

Designation	OD (in)	Rated Torque (in-lbs)	Peak Torque(in-lbs)	Limit Torque(In-lbs)	Axial Misalignment(in)	Angular Misalignment(deg)	Rated Speed(RPM)
306	6.00	19,000	24,700	30,350	0.054	0.333	20,000
406	6.00	27,800	34,200	43,100	0.044	0.250	20,000
506	6.00	32,000	41,800	51,780	0.036	0.200	20,000
307	7.20	36,200	46,600	57,100	0.068	0.333	18,000
407	7.20	51,800	64,100	80,300	0.055	0.250	18,000
507	7.20	61,800	80,500	100,110	0.044	0.200	18,000
308	8.70	69,000	85,800	110,000	0.094	0.333	16,000
408	8.70	98,000	120,900	147,000	0.068	0.250	16,000
508	8.70	117,000	150,000	189,500	0.055	0.200	16,000
310	10.50	131,300	167,300	210,000	0.112	0.333	13,000
410	10.50	184,000	231,000	285,500	0.085	0.250	13,000
510	10.50	220,200	286,200	356,700	0.067	0.200	13,000
312	12.60	250,200	325,200	400,400	0.136	0.333	11,000
412	12.60	339,500	432,200	543,300	0.106	0.250	11,000
512	12.60	416,000	540,800	673,900	0.082	0.200	11,000
315	15.20	476,700	619,700	763,000	0.165	0.333	10,000
415	15.20	638,000	815,100	1,020,800	0.130	0.250	10,000
515	15.20	784,200	1,019,500	1,270,400	0.100	0.200	10,000
318	18.30	906,000	1,177,800	1,450,000	0.196	0.333	9,000
418	18.30	1,190,000	1,516,500	1,904,000	0.160	0.250	9,000
518	18.30	1,480,000	1,924,000	2,397,600	0.122	0.200	9,000
322	22.00	1,730,000	2,212,900	2,681,000	0.240	0.333	8,000
422	22.00	2,210,000	2,797,000	3,481,000	0.197	0.250	8,000
522	22.00	2,793,000	3,630,000	4,525,000	0.148	0.200	8,000

All data in this catalog are non-binding and cannot be used for legal claims. The data provided was created under certain assumptions of possible use. Many possible combinations of environment and service exist that fall outside the scope. It is the customers responsibility to establish whether the selected products meet the requirements of their machinery, Riverhawk engineering is available to provide further data to help customers evaluate selected products upon request.

Relative to EC directives, the components within this catalog are not machines but are components that can be installed into machines in conformity to EC directive.