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Rough Blue Round Belting and Belts

Dura-Belt rough blue round urethane belts are made from both 80A and 88A durometer urethane cord. The rough surface causes each to have the same lower coefficient of friction (0.4) so that belts can slip a little in pulleys without overheating and abrading. Rough blue round belting is also ideal for carrying light items on slider beds or where accumulation occurs. It is not recommended for carrying heavy items because the resultant higher friction will eventually smooth out the rough surface and thereby increase the belt's coefficient of friction. Rough blue urethane cord is often used in paper moving, printing, and postal applications because the rough surface can catch the edge of a sheet of paper and push it along.

People often think that the rough textured surface will grip pulleys better and slip less than smooth belts, but surface contact area is what counts with urethane belting. The more surface contact, the greater the coefficient of friction. Therefore, smooth belts will grip better, but if forced to slip, they tend to overheat and stretch or abrade. Rough blue belting can help overcome this problem.

  • Rough surface effectively makes belts more abrasive resistant.
  • The urethane material is food grade, but the rough surface may not be FDA approved for some applications.
  • Replaces Polycord® belts and belting.
  • Available in either rough or matte surface (slightly less rough).
  • Rough blue cord is only available in 80A and 88A durometer. Smooth blue cord is available in 80A, 85A and 90A.
  • Available with polyester cord reinforcement -- for less stretch and more strength.
  • Superior water resistance (hydrolytically stabilized) -- ideal for washdown applications.
rough blue polyurethane oring belts
Rough Blue Round Urethane Cord 
Size (diameter) mm 2 3 4 5 6 7 8 9 10 12 15 18
inch 0.08 0.12 0.16 0.20 0.24 0.28 0.31 0.35 0.39 0.47 0.59 0.71
Minimum Pulley Dia. mm 16 27 36 45 54 63 72 81 90 108 135 162
inch 0.63 1.06 1.42 1.77 2.13 2.48 2.83 3.19 3.54 4.25 5.31 6.38
Max Belt Loading kg 0.2 0.5 0.9 1.4 2.0 2.7 3.5 4.4 5.4 7.8 12.2 17.6
lbs. 0.5 1.1 1.9 3.0 4.3 5.9 7.7 9.7 12.0 17.3 27.0 38.9
Recommended Stretch 8% to 16% 8% to 16% 8% to 16% 8% to 16% 8% to 16% 8% to 16% 8% to 16% 8% to 16% 8% to 16% 8% to 16% 8% to 16% 8% to 16%

Rough Blue Round Urethane Cord Reinforced with Polyester
Size (diameter) mm 4 5 6 7 8 9 10 12 15 18
inch 0.16 0.20 0.24 0.28 0.31 0.35 0.39 0.47 0.59 0.71
Minimum Pulley Dia mm 40 50 60 70 80 90 100 120 150 180
inch 1.6 2 2.4 2.75 3.15 3.54 3.94 4.72 5.91 7.09
Max Belt Loading kg 8 12 18 20 28 33 42 60 98 140
lbs. 17 26 40 44 62 73 93 132 216 309
Maximum Stretch 1% 1% 1% 1% 1.5% 2% 2% 2% 2% 2%
Reinforcement Drill Bit # 1 1 1 1 1 1 1 2 2 3

Also see:   Cord Profiles, Abuse Resistant Powered Roller Belts, Rough Green Belts,
Rough Green Lineshaft Belts, and Abuse Resistant Rough Green Twisted Belts
For the best in rough blue belting and belts, insist on DuraBelt.
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