N Type

N Type are a rugged screw coupled, mid sized series of connectors, with versions available for use up to 11 GHz (50 ohm) / 3 GHz (75 ohm). N Type connector interface is according to Mil 30912 and are sealed to IP67 when mated. 50 ohm and 75 ohm versions of N Type are available

Note : 50 and 75 Ohm version of N Type connectors are not compatible and permanent damage to the connector may occur if mated.

For details; http://www.coax-connectors.com/products/connectors/n-type.aspx