RoyalCorp Polyurethane V Belts and Round Belts can be manufactured in any size from .062" (1.57mm) through .562" (14.27mm) in cross section. We manufacture belts in fractional, decimal and millimeter equivalents as well as O-ring size cross sections. The Polyurethane V Belts and Round Belts size is designated by length rather than inside diameter. Our minimum length is 3-3/4" (95.25mm) in small cross sections. Larger cross section belts will have somewhat longer minimum lengths. There is no maximum length limitation on the Pyrathane® round belt.

Round cross section belts will run satisfactorily in either vee or round bottom pulleys. Vee bottom pulleys will, however, provide a much more positive drive than will round bottom pulleys because of the wedging action of the round belts in the vee pulley. Vee bottom pulleys should be designed with approximately a 36 degree inclusive angle and should be deep enough so that the belt will not run on the bottom. See Figure 1.

Round bottom pulleys may allow slippage in higher load situations which may or may not be desirable. Round bottom pulleys should be designed with a radius that matches the cross section of the belt being used. See Figure 2.

We generally recommend the Pyrathane® belt be run under tensionhowever, some applications may run satisfactorily when just the slack is taken up (under very little tension). An example would be when running in a vee groove where the wedging effect provides the driving grip.

Round Cord Cross Sectional Sizes with Round Belt Minimum Lengths and Minimum Inside Diameters

Cross Section of Cord		Minimum Belt Lengths						Minimum Belt I.D.
Cross Section of Cord		For 83A Durometer Materials		For 70A Durometer Material		For 92A Durometer Materials		For 83A Durometer Materials		For 70A Durometer Material		For 92A Durometer Materials
Inches	MM	Inches	MM	Inches	MM	Inches	MM	Inches	MM	Inches	MM	Inches	MM
.062	-	3.75	95.25	3.75	95.25	3.75	95.25	1.132	28.744	1.132	28.744	1.132	28.744
.070	-	3.75	95.25	3.75	95.25	3.75	95.25	1.124	28.541	1.124	28.541	1.124	28.541
.078	2	3.75	95.25	3.75	95.25	3.75	95.25	1.116	28.338	1.116	28.338	1.116	28.338
.093	-	3.75	95.25	3.75	95.25	3.75	95.25	1.101	27.957	1.101	27.957	1.101	27.957
.100	2.5	3.75	95.25	3.75	95.25	3.75	95.25	1.094	27.779	1.094	27.779	1.094	27.779
.103	-	3.75	95.25	3.75	95.25	3.75	95.25	1.091	27.703	1.091	27.703	1.091	27.703
.118	3	3.75	95.25	3.75	95.25	3.75	95.25	1.076	27.332	1.076	27.332	1.076	27.332
.125	-	3.75	95.25	3.75	95.25	3.75	95.25	1.069	27.144	1.069	27.144	1.069	27.144
.139	-	3.75	95.25	3.75	95.25	3.75	95.25	1.055	26.788	1.055	26.788	1.055	26.788
.157	4	4.00	101.60	4.00	101.60	4.00	101.60	1.116	28.353	1.116	28.353	1.116	28.353
.187	4.75	4.50	114.30	4.5	114.30	4.5	114.30	1.245	31.633	1.245	31.633	1.245	31.633
.197	5	4.50	114.30	4.50	114.30	4.75	120.650	1.235	31.379	1.235	31.379	1.315	33.400
.210	-	4.75	120.65	4.75	120.65	4.75	120.65	1.302	33.070	1.302	33.070	1.302	33.070
.218	5.5	4.75	120.65	4.75	120.65	4.75	120.65	1.294	32.867	1.294	32.867	1.294	32.867
.236	6	5.00	127.00	5.00	127.00	5.00	127.00	1.356	34.431	1.356	34.431	1.356	34.431
.250	-	5.00	127.00	5.00	127.00	5.00	127.00	1.342	34.075	1.342	34.075	1.342	34.075
.274	7	5.50	139.70	5.50	139.70	5.75	146.05	1.477	37.508	1.477	37.508	1.556	39.530
.312	8	6.00	152.40	6.00	152.40	6.00	152.40	1.598	40.586	1.598	40.586	1.598	40.586
.375	-	7.50	190.50	7.50	190.50	7.50	190.50	2.012	51.113	2.012	51.113	2.012	51.113
.437	11	8.50	215.90	8.50	215.90	8.50	215.90	2.269	57.623	2.269	57.623	2.269	57.623
.500	-	9.25	234.95	9.25	234.95	9.50	241.30	2.444	6.087	2.444	6.087	2.524	64.108
.562	-	12.00	304.80	12.00	304.80	13.50	342.90	3.258	82.746	3.258	82.746	3.735	94.874

Minimum Pulley Diameter Recommendations

Belt Cross Section	83A	92A
.139" and smaller	.375"	.500"
.156"	.500"	.750"
.187" & .197""	1.00"	1.250"
.218"	1.250"	1.500"
.236"	1.250"	1.750"
.250"	1.500"	2.250"
.312"	2.000"	3.000"
.500"	3.000"	4.000"

Polyurethane V Belts Dimension

Belt Type	Width(dp) mm	Top Wdith (b) mm	Height mm	Angle (a)	Length Range	Inch
8	7.5	8	5	40	380~15000	15"~590"
Z	9.5	10	7	40
A	11	13	8	40
B	14	17	11	40
C	19	22	14	40

product-1-1

Hot Tags: polyurethane v belts and round belts, China, suppliers, manufacturers, factory, customized, wholesale, buy, low price, for sale, Polyurethane Belt, Polyurethane V Belts and Round Belts, Seamless Truly Endless Polyurethane Timing Belts, Special Designed Polyurethane Synchronous Belts, Cookie Belts, Polyurethane Open End Synchronous Belts