4 mm Smooth

FCU1-D0401N-A3U2 M, 1 mm Range, NPN, Normally Open

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

FCU1-D0401N-B3U2 M, 1 mm Range, NPN, Normally Closed

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

FCU1-D0401P-A3U0.2-P12

For PDF Specs:

FCU1-D0401P-A3U0.3/P8

Inductive Proximity Sensor, Cylindrical , Stainless Steel, Shielded Construction, 4 mm Smooth Body, 1 mm Range, PNP Output, Normally Open Output, 0.3 m Pre-Wired Cable Connect

FCU1-D0401P-A3U2 M, 1 mm Range, PNP, Normally Open

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

FCU1-D0401P-B3U2 M, 1 mm Range, PNP, Normally Closed

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