Plastic Pulley Specs Data Sheet

Composite Nylon Pulleys
Reinforced with Fiberglass

Advantages

1. Rugged. Our plastic pulleys are used in the hostile environment experienced by commercial lawn mowers where high speeds (3600 rpm) and high temperatures (170°F) far exceed stresses encountered in most conveyors. Even under such severe conditions, our molded-in bearings and drive adapters will not separate from the fiberglass-reinforced nylon rim.
   
   
2. Molded-in bearings extend belt life. Molded-in bearings on our composite idler pulleys are more precise than pressed-in bearings and drive adapters. Pressed-in bearings may slip from side to side by as much as 1/16", meaning adjacent idlers can be out of line by 1/8". The resulting misalignment can cause premature belt wear. Our bearings and drive adapters do not slip. True-running idlers extend belt life.
   
   
3. Higher Quality and Lower Prices. The production of molded-in bearings requires fewer steps. This facilitates automation, improves quality, and reduces costs. Consequently, our prices are very competitive.
   
   
4. TIR (Total Indicated Readout) for idler pulleys is 0.014" (0.4mm) maximum because they have molded-in bearings. TIR for drive pulleys is .020" (.5mm) maximum because we have to press in drive adapters.

Printable Version

Materials

High-grade plastic composite nylon pulley (sheaves) are reinforced with 33% fiberglass -- operating temperature range -20°F to 230°F (-29°C to 110°C). Our 1.9" poly-v endcaps are anti-static, but our other nylon pulleys are not anti-static.

Bore adapters are sintered powdered metal.

Standard bearings are imported 6203-2RS that are rated A.B.E.C.-1 precision and have radial seals. U.S. made bearings are also available. Bearing grease is Chevron SRI-2 or the equivalent (30% grease fill) -- operating temperature range -20°F to 350°F (-29°C to 177°C), complies with Mil-Spec MILG3545G.

Bearings with seals are standard and are better for dirty environments, but seals can be tight, making the bearing difficult to turn, so most conveyors use shielded bearings.

Bearings with shields are available but must be specified when ordering. Shielded bearing turn easier, so they put less strain on motor and belts. They are also more energy efficient. Most roller conveyors use shielded bearings.

Chemical Resistance

Chemicals that damage Nylon

Other chemicals may also attack nylon, but these are the most common. Damage depends on concentration, temperature and exposure time.