ABEC BEARING: A precision bearing used in rollers where speeds exceed 200 rpm, heavy loads exist, or in applications requiring significantly lower noise levels.

AXLE: A shaft on which wheels or rollers rotate.

BALL TRANSFER TABLE: A group of ball transfers over which flat surfaced objects may be moved in any direction.


BALL TRANSFER UNIT: A device with a free rotating ball. When used in a group will allow flat surfaced objects to be moved in any direction.


BELT SPEED: The speed of a conveyor belt measured in feet per minute. Belt speed can be measured by marking a known length (feet) of the belt and measuring the time (minutes) to pass from beginning to end. Standard speed for an Ashland power belt conveyor is 60 FPM. Other constant and variable speeds are available.

BF or BETWEEN FRAME DIMENSION: Measured as the inside distance between the rails of a conveyor frame, also known as BR or between rail.


CEILING HANGER: A support fastened from an overhead structure. The structure must be designed to support both product and conveyor total weights, and roof loads if a building structure.


CENTER DRIVE: A motor-gearbox drive system placed near the underside center of a power conveyor. Standard drive placement is at the end. A center drive allows for forward and reverse operation of the conveyor belt. Also used with inclines for both incline and decline operation.

CDLR or CHAIN DRIVEN LIVE ROLLER: A conveyor of rollers powered by a drive system that drives the rollers via sprockets and roller chain. Used for heavy loads.

COUPLERS: Used to connect two sections of gravity roller conveyor together. Standard couplers include “hook & rod” as well as butt couplers.


DEAD LOAD: The weight of the conveyor without product. When calculating frame and support capacity both the dead load and the live load must be included.

END DRIVE: A motor-gearbox drive system located at the end of a power conveyor.

FLOW: The direction of travel of product on a conveyor.

FPM or FEET PER MINUTE: A measurement used for product flow rates, feet per minute. (also see Belt Speed)

GRAVITY ROLLER CONVEYOR: A conveyor frame with free rotating rollers. Product is advanced manually by pushing or by gravity when the conveyor is sloped.


GREASED PACK BEARING: A standard commercial bearing with grease as its lubricant. Grease pack bearings are used in rollers for low speed power applications. The grease will extend the life of the bearing but are not recommended for gravity applications due to the additional rolling resistance.

H-STAND: A conveyor support which mounts to the floor. Used for permanent conveyor installation. H-stands provide vertical adjustment to create a level or sloped conveyor installation.


KNEE BRACE: A brace used to increase the rigidity between a conveyor and support. Recommended for power incline conveyors, castered supports, or any support requiring more rigidity.


LACING: Lacing is used to connect two ends of conveyor belt together. This allows for a conveyor belt to be easily installed or removed.


LIVE LOAD: The maximum weight of product on the conveyor. Include both live and dead loads when calculating frame and floor support capacities.

NOSEOVER: A short section of conveyor that transitions a power conveyor from incline to horizontal. A single noseover will transition up to 15 degrees while a double will transition up to 30 degrees.

OAL or OVERALL LENGTH: The overall length of a conveyor or conveyor frame.

OAW or OVERALL WIDTH: The dimension outside to outside of frame rails.

PIN RETAINED: A pin retained roller will contain no spring or dimples; instead the shaft is drilled on each end for a retaining pin. Once the roller is placed into a frame, the retaining pins are inserted.

POP-OUT ROLLER: A safety device to prevent entanglement in a power belt conveyor. It is placed at the end of a power conveyor and if an object is pulled between it and the belt the roller will pop-out freeing the object.

POWER BED LENGTH: The length of a power belt conveyor minus the head and tail sections which contain the pulleys.


POWER FEEDER: A driven length of belt conveyor used to move product horizontally onto an incline conveyor.

ROLLER: A tubular product with bearings and an axle. The tube rotates freely around the axle. Used in gravity roller conveyor. Features such as grooves and sprockets may be added for use with power conveyors.


ROLLER BED POWER CONEYOR: A powered belt unit in which rollers are used to support the load.

ROLLER CENTERS: The distance measured along the frame rail of a conveyor from the axle center of one roller to the axle center of the next roller.

SET HIGH: Refers to the location of the top of the roller in a conveyor frame being slightly above the frame rail. This allows the load to overhang the frame rails.

SET LOW: Refers to the location of the top of the roller in a conveyor frame being below the frame rails. This allows the frame rails to act as a guard for the load.


ROUGH TOP BELT: A power conveyor belt that is normally used on incline conveyor. The profile of the belt is rough textured and prevents packages from sliding backwards.

SKATEWHEEL CONVEYOR: A gravity conveyor comprised of skatewheels mounted on common shafts or axles. The conveyor is used with lightweight loads that have a firm flat bottom and is ideal for temporary set-up when used with tripod supports.


SLIDER BED POWER CONVEYOR: A power belt unit in which a stationary flat surface is used to support the load. Slider bed produces more friction than roller bed and therefore requires more horsepower for equivalent live loads.

SPRING RETAINED: A spring retained roller contains a spring which is captured between the bearing and a shaft dimple. This allows one end of the shaft to be depressed into the roller for easy insertion into a conveyor frame. Spring retained is Ashland's standard roller construction.


SPUR: A conveyor section used to divert product from one conveying line to another. These can be straight or curved. Left or right hand designation is needed when ordering.

TAKE UP: A device used to adjust the tension of a belt on a powered conveyor.

TOR or TOP OF ROLLER: The dimension from the floor to the top of the roller.

TOS or TOP OF STAND: The dimension from the floor to the top mounting surface of a floor support.

TRACKING: Steering the belt on a powered conveyor to keep the belt near the center of the conveyor.

TRIPOD SUPPORT: A three legged support for light duty gravity conveyor. The height is adjustable and does not require fastening to the conveyor or floor and is also ideal for temporary set-ups.


WHEEL DENSITY: Wheel density is described as the number of wheels per linear foot of conveyor. It is also recommend that there be a minimum of three axles and five wheels under the load at all times.