Product Description

1.5INV Series Retroreflector Adapter

Use an SMR target with your Invar System

The 1.5INV Series magnetic adapters provide an SMR nest which fits on any of our Invar System bars. With both English and metric versions available, the centerpoint of a 1.5″ diameter SMR may be held either 1.000″ or 25mm away from the interface surface between the adapter and the Invar bar. The SMR seats on a 3-point conical land and is held in place by a strong magnet. The discontinuous three point mounting system gives extra room for the SMR to be tilted further away from the bar’s main axis, giving additional mounting flexibility. The adapter’s threaded mount is 3/8″-24 for compatibility with our Invar system.

Choose the desired model number from the table below, which shows both the English and metric versions of this adapter. 

Model Offset Tolerance
1.5INV-1 1″ ±0.0005″
1.5INV-25MM 25 mm ±0.013 mm

May Be Used With

Any 1.5″ diameter SMR
Our Invar System tubing 


Material: Stainless steel
Hardness: HRC 42-45


PDF Download Drawing

Brunson 1.5INV drawing