4 mm Threaded

FCU1-040.8P-B3U0.2-P5

For PDF Specs:

FCU1-0401N-B3U2 M, 1 mm Range, NPN, Normally Closed

M, Inductive Proximity Sensor, Shielded, 1 mm Range, NPN, Normally Closed, 2 m Cable

FCU1-0401P-A3U2 M, 1 mm Range, PNP, Normally Open

M, Inductive Proximity Sensor, Shielded, 1 mm Range, PNP, Normally Open, 2 m Cable