Quick take for the route
This E2EC-CR5B1 5M is a shielded inductive prox with a 0.5 mm sensing distance — tight enough to spot a bearing race wobble on a cam follower, but you won't use it for long-range presence. PNP-NO, 3-wire, cable leads. Body is nickel-plated brass, sealed to IP64, so out here in the grease it'll handle coolant splash and dust, but don't dunk it.
0.5 mm sensing distance; shielded design allows flush mounting. Supply 4.75–30 V, response 1 kHz, operating range -25 to 70 °C.