Hub and Pin

What is Hub and Pin?

Definition of Hub and Pin in Construction
These two terms are normally used together when discussing site layout and surveying.

A hub and pin is most commonly a driven wooden stake into the ground, with a steel pin, hammered into the top of the hub. These two devices are used to provide the layout points on a construction project. The hub and pin locations are shown on the surveyors overall layout of the project and have been established with various control points throughout the site. The most common method of establishing the location of a hub and pin is with a transit, tape, and plumb bob. The surveyor will set up their transit on a coordinate control point and shoot the location of the intended hub and pin. The surveyors assistant will then stand at the location as identified by the transit and the measuring tape. This location will be the point that the hub and pin will be located. The surveyor’s assistant will use a plumb bob to drop the point of the mark, down to ground level. A hub will be driven into the ground and the pin will be nailed into the face of the hub at exactly the tip of the plumb bob. The use of a hub and pin is the most common method of field layout and is understood as the standard in layout and coordination on a construction project.