The Cole Hersee M-639 Heavy-Duty Push Button Switch is a rugged, marine-grade Single Pole Single Throw (SPST) Normally Closed (NC) momentary switch designed for dependable operation in harsh marine, automotive, industrial, agricultural, and commercial environments. Its gasket-sealed construction protects the internal components from moisture, dust, and contaminants, ensuring reliable performance in demanding conditions.

Manufactured with a heavy-duty brass body, the M-639 is built for long service life and is ideal for controlling horns, engine shut-off systems, safety interlocks, relays, alarms, and other momentary electrical circuits. The switch is normally ON (closed) and opens the circuit when the button is pressed (momentary OFF).

The threaded 5/8"-32 mounting stem allows secure installation in panels up to 3/4" thick, making it suitable for dashboards, control panels, machinery, and marine electrical systems.

Features

• Genuine Cole Hersee® electrical component

• Heavy-duty momentary push button switch

• SPST (Single Pole Single Throw)

• Normally Closed (NC) – Momentary OFF

• Gasket-sealed to resist moisture and dust

• Heavy-duty brass body for maximum durability

• Suitable for harsh marine and industrial environments

• Easy panel mounting

• Long service life

• Ideal for marine, automotive, agricultural, and industrial equipment

Specifications

• Brand: Cole Hersee

• Manufacturer Part Number: M-639

• Product Type: Momentary Push Button Switch

• Switch Configuration: SPST (Single Pole Single Throw)

• Contact Type: Normally Closed (Normally ON – Momentary OFF)

• Current Rating: 10A @ 12V DC

• Operating Voltage: 6–36V DC

• Body Material: Heavy-Duty Brass

• Seal: Gasket-Sealed Against Moisture & Dust

• Mounting Thread: 5/8"-32

• Maximum Panel Thickness: 3/4" (19 mm)

• Applications: Marine electrical systems, horns, emergency stop circuits, relays, alarms, engine controls, agricultural machinery, industrial equipment, and commercial vehicles

Weight

• Approximate Weight: 2.5 oz (0.16 lb / approximately 70 g)