Round belts and o-ring belts are light-to-medium duty belts used in power transmission applications. Round belts are solid or hollow and vary in terms of weight and size. They use friction to stay in contact with round belt pulleys and must be stretched or elongated to provide proper driving tension. O-ring belts (endless round belts, endless drive belts) also vary in weight and size, but do not require a belt tensioner. They can be used with both round belt pulleys and V-belt pulleys. Most o-ring belts are made of materials that are resistant to chemicals and compounds such as oxygen, ozone, oils, and grease. They can be cleaned easily and resist abrasion and marking. Belts that are heat-sealed do not require tooling changes. Most round belts and o-ring belts are between 1/16 in. and 3/4 in. wide and at least 3 ft. long, depending on the size of the cross-section. Some products have tensile strengths of up to 8,000 psi and a temperature resistance that ranges from
- 60° F to 225 F°.

Specifications for round belts and o-ring belts include cross-sectional diameter, length, working tension, operating temperature, belt material, and reinforcement material. Belt materials vary in terms of strength, elasticity, and power transmission capabilities. Nitrile is used across a wide range of temperatures and provides good resistance to petroleum hydrocarbons and fuels. Leather absorbs lubricants and provides effective sealing against rough surfaces. Neoprene is a synthetic material with outstanding physical toughness. Polyurethane is flexible and offers good abrasion resistance. Polyvinyl chloride (PVC) is smooth, flexible, non-toxic, and often rated for use in food processing applications. Round belts and o-ring belts that are made of rubber usually contain natural compounds such as polyisoprene. Reinforcement materials include fiberglass, polyester and steel, as well as proprietary products such as Kevlar^®, a registered trademark of DuPont.

Round belts and o-ring belts are light-to-medium duty belts used in power transmission applications. Round belts are solid or hollow and vary in terms of weight and size. They use friction to stay in contact with round belt pulleys and must be stretched or elongated to provide proper driving tension. O-ring belts (endless round belts, endless drive belts) also vary in weight and size, but do not require a belt tensioner. They can be used with both round belt pulleys and V-belt pulleys. Most o-ring belts are made of materials that are resistant to chemicals and compounds such as oxygen, ozone, oils, and grease. They can be cleaned easily and resist abrasion and marking. Belts that are heat-sealed do not require tooling changes. Most round belts and o-ring belts are between 1/16 in. and 3/4 in. wide and at least 3 ft. long, depending on the size of the cross-section. Some products have tensile strengths of up to 8,000 psi and a temperature resistance that ranges from
- 60° F to 225 F°.

Specifications for round belts and o-ring belts include cross-sectional diameter, length, working tension, operating temperature, belt material, and reinforcement material. Belt materials vary in terms of strength, elasticity, and power transmission capabilities. Nitrile is used across a wide range of temperatures and provides good resistance to petroleum hydrocarbons and fuels. Leather absorbs lubricants and provides effective sealing against rough surfaces. Neoprene is a synthetic material with outstanding physical toughness. Polyurethane is flexible and offers good abrasion resistance. Polyvinyl chloride (PVC) is smooth, flexible, non-toxic, and often rated for use in food processing applications. Round belts and o-ring belts that are made of rubber usually contain natural compounds such as polyisoprene. Reinforcement materials include fiberglass, polyester and steel, as well as proprietary products such as Kevlar^®, a registered trademark of DuPont.

Round belts and o-ring belts vary in terms of application and features. Some products are suitable for industrial applications such as weighing, bagging, sorting, bottling, gluing, sealing, pulling, and shrink-wrapping. Others are used in live roller conveyors such as line shaft conveyors and powered roller conveyors. The printing industry uses round belts and o-ring belts in collating, sorting, folding, and imaging equipment. Round belts and o-ring belts are also used in office equipment such as photocopiers and printers. In terms of features, some round belts and o-ring belts  prevent the buildup of static electricity or resist damage from ultraviolet (UV) light. Belts that are supplied as rolls may be cut and spliced to desired lengths. Belts that carry approvals from agencies such as the U.S. Department of Agriculture (USDA) or Food and Drug Administration (FDA) are also available.