Reduced Moment Couplings

UTAS API 671 Standard reduced moment coupling designs range from 6-inch overall diameter to 15-inch overall diameter for use in light- to medium-duty applications. This design is ideal for those applications where rotor dynamic characteristics are a concern.

Each reduced moment coupling selection can be customized for your application.

Couplings subjected to transient conditions should be evaluated using the peak torque. Limit torque is 133% of the peak torque. Couplings subjected to a “one-time” momentary load should be evaluated using the limit torque.
Axial deflection is based on the rated torque listed.
Parallel offset equals the value shown multiplied by the distance between flexures.
Total coupling weight was calculated using an 18 in. DBSE and two hubs at maximum bore diameter.

* Contact Collins Aerospace engineering for coupling selections requiring: higher speed, axial/angular misalignment or torque.

REQUEST INFO

Type Size	Rated Torque (in-lb)	Axial Deflection (± in.)	Misalignment per End (± Deg)	Parallel Offset (in./in.)	Rated Speed (RPM)	Limit Speed (RPM)	Coupling OD (inches)	Max Taper Bore (inches)	Coupling Weight (lbs)	CG Location (inches)
305	9,300	0.049	0.333	0.0058	15,000	39,000	4.560	1.50	8.0	-1.593
405	11,700	0.041	0.250	0.0044	15,000	44,000	4.560	1.50	8.1	-1.594
505	15,300	0.034	0.200	0.0035	15,000	49,000	4.560	1.50	8.1	-1.594
307	20,100	0.059	0.333	0.0058	15,000	29,000	6.050	2.00	15.2	-1.946
407	29,400	0.049	0.250	0.0044	15,000	33,000	6.050	2.00	15.3	-1.947
507	40,500	0.041	0.200	0.0035	15,000	37,000	6.050	2.00	15.4	-1.949
308	30,000	0.063	0.333	0.0058	15,000	24,500	7.325	2.50	24.2	-2.375
408	53,700	0.053	0.250	0.0044	15,000	28,500	7.325	2.50	24.4	-2.378
508	78,600	0.044	0.200	0.0035	15,000	31,500	7.325	2.50	24.5	-2.380
309	56,400	0.092	0.333	0.0058	10,000	21,000	8.705	3.00	38.2	-2.697
409	79,200	0.077	0.250	0.0044	10,000	24,000	8.705	3.00	38.5	-2.700
509	112,100	0.064	0.200	0.0035	10,000	26,500	8.705	3.00	38.7	-2.703
311	60,600	0.102	0.333	0.0058	10,000	17,500	10.270	3.50	61.6	-3.166
411	110,700	0.085	0.250	0.0044	10,000	20,500	10.270	3.50	62.0	-3.170
511	163,200	0.071	0.200	0.0035	10,000	22,500	10.270	3.50	62.4	-3.173
312	75,600	0.115	0.333	0.0058	9,000	15,500	11.730	4.00	84.2	-3.501
412	160,200	0.096	0.250	0.0044	9,000	18,000	11.730	4.00	84.8	-3.506
512	247,200	0.080	0.200	0.0035	9,000	19,500	11.730	4.00	85.4	-3.511
314	125,700	0.130	0.333	0.0058	8,000	14,000	12.960	4.50	115.1	-3.971
414	240,900	0.108	0.250	0.0044	8,000	16,500	12.960	4.50	115.9	-3.977
514	367,500	0.090	0.200	0.0035	8,000	18,000	12.960	4.50	116.7	-3.984
315	188,700	0.144	0.333	0.0058	8,000	12,500	14.400	5.00	154.1	-4.502
415	240,000	0.120	0.250	0.0044	8,000	14,500	14.400	5.00	155.3	-4.100
515	439,800	0.100	0.200	0.0035	8,000	16,000	14.400	5.00	156.4	-4.518

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