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ENGINEERING & TECHNICAL INFORMATION

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Load Ratings for Idlers

The Following conveyor belt capacity charts show tons per hour (TPH) based on
material weighing 100 lbs. per cubic foot, 20° material surcharge angle with three
equal length rolls on troughing idlers.

Load Ratings for CEMA Idlers - Rigid Frame (Lbs)

Idler Class	Belt Width (Inches)	Trough Angle			Single Roll Return	Two Roll Vee
Idler Class	Belt Width (Inches)	20°	35°	45°	Single Roll Return	Two Roll Vee
CEMA B Idlers	18	410	410	410	220
	24	410	410	410	190
	30	410	410	410	165
	36	410	410	396	155
	42	390	363	351	140
	48	380	353	342	125
	Ratings Based on Min L10 of 30,000 Hours at 500 RPM
CEMA C Idlers	18	900	900	900	475
	24	900	900	900	325
	30	900	900	900	250	500
	36	900	837	810	200	500
	42	850	791	765	150	500
	48	800	744	720	125	500
	54	750	698	675	*	500
	60	700	650	630	*	500
	66				*	500
	Ratings Based on Min L10 of 30,000 Hours at 500 RPM * Use CEMA “D” Return Idlers
CEMA D Idlers	24	1,200	1,200	1,200	600
	30	1,200	1,200	1,200	600
	36	1,200	1,200	1,200	600	850
	42	1,200	1,200	1,200	500	850
	48	1,200	1,200	1,200	425	850
	54	1,200	1,116	1,080	375	850
	60	1,150	1,070	1,035	280	850
	66				215	850
	72	1,050	977	945	155	850
	78				125	850
	Ratings Based on Min L10 of 30,000 Hours at 500 RPM
CEMA E Idlers (see note # 4)	36	1,800	1,800	1,800	1,000	1,300
	42	1,800	1,800	1,800	1,000	1,300
	48	1,800	1,800	1,800	1,000	1,300
	54	1,800	1,800	1,800	925	1,300
	60	1,800	1,800	1,800	850	1,300
	66				775	1,300
	72	1,800	1,800	1,800	700	1,300
	78				625	1,300
	84	1,674	1,674	1,650	550	1,300
	90				475	1,300
	96	1,750	1,628	1,575	400	1,300
	102				250	1,300
	Ratings Based on Min L10 of 30,000 Hours at 500 RPM Rigid Frame and Catenary Where Applicable
CEMA F Idlers (see note # 4)	60		3,000	3,000	1,500	**
	72		3,000	3,000	1,200	**
	84		3,000	3,000	900	**
	96		2,800	2,800	600	**
	Ratings Based on Min L10 of 30,000 Hours at 500 RPM Rigid Frame and Catenary Where Applicable ** For Vee Returns Consider Using CEMA “E” Series

NOTES FOR TABLE:

1. TROUGHING IDLER LOAD
RATINGS ARE FOR THREE EQUAL LENGTH ROLLS.

2. LOAD RATINGS ALSO APPLY FOR IMPACT ROLLS.

3. TROUGHING IDLER LOAD
RATINGS ARE BASED ON A LOAD DISTRIBUTION OF 70% ON CENTER ROLL AND 15% ON EACH END ROLL FOR ALL TROUGH ANGLES.

4. DOUGLAS MANUFACTURING DOES NOT MANUFACTURE “CEMA E” or “CEMA F” CLASS IDLERS AS OF NOVEMBER 2006.

Picking Idler Load Ratings (Lbs.)

Live Shaft Idler Load Capacities (Lbs.)

Belt Width	CEMA C	CEMA D	CEMA E
24	475	600
30	475	600
36	325	600	1,260
42	250	600	1,200
48	200	530	1,000
54	150	440	1,000
60	125	400	1,000
72		280	925
84			775
96			625

Belt Width	CEMA C	CEMA D	CEMA E
18	1,200
24	1,200	1,400	2,100
30	1,200	1,400	2,100
36	1,200	1,400	2,100
42	1,100	1,400	2,100
48	1,000	1,275	2,100
54	875	1,150	2,100
60	780	1,000	2,100
72		850	2,100
84			1,825

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All dimensions and specifications subject to change without notice. Certified dimensions and specifications of ordered material available on request.
Copyright © 2007, Douglas Manufacturing Co., Inc., Pell City, AL 35125-1515, (205) 884-1200, sales@douglasmanufacturing.com. All rights reserved.