A paddle flight is a type of attachment fitted to drop-forged conveyor chains. It is frequently used for drag conveying cement, wood chips, coal and aggregates.
Parallax error is error in reading an instrument employing a scale and pointer because the observer's eye and pointer are not in a line perpendicular to the plane of the scale. It is a common problem with steel rule or tape chain wear gauges.
The pitch of a chain is the average distance between pins.
The pitch circle diameter is an imaginary circle running through the centres of the chain rollers of a chain when engaged on the sprocket.
A plate is a chain component. Plates are typically paired, two on an inner link and two on an outer link.
Preloading is when the manufactured applies a load to a finish chain to check its integrity and bed in components. This load is usually a minimum of 30% of the breaking load.
Press fit is the difference between the diameter of the round component (pin or bush) and the plate hole into which it is inserted.
A pulley is a tubular component with flanges used to guide a leaf chain during lifting operations.
PUWER is short for Provision and Use of Work Equipment Regulations 1998. PUWER covers any equipment used by an employee at work. Lifting equipment is also subject to the requirements of LOLER.