Somfy Simu DMI5Hz 25Nm Radio Motor Fit and Torque Guide

Torque sets the first limit on a shutter motor. Tube inside diameter sets the second. The Simu DMI5Hz 25Nm 18rpm 120V (2004672) turns 25 Nm at 18 rpm and seats in any tube with a 1.85 in minimum inside diameter. Dealers put it on mid-weight rolling shutters and awnings that need radio control plus a crank the owner can turn when the power drops.

Somfy builds the Hz receiver into the motor head, so the install needs no external radio box. The CMO head carries a 7 mm hex override port. That combination covers the two jobs a shutter owner cares about: push-button operation every day, and a hand crank on the one night the breaker trips.

Pick this motor by torque and tube size

Rolling shutter weight drives the torque choice. A 25 Nm motor on a 60 mm octagonal tube handles the aluminium shutter curtains most residential and light commercial openings use, and it has headroom for a slat profile heavier than vinyl. Somfy publishes the DMI5Hz line across 15 Nm, 25 Nm, 30 Nm and 35 Nm, so a dealer who finds 25 Nm short at the top of the opening can step to the 35 Nm reference on the same head and bracket pattern.

Speed matters as much as torque on a tall shutter. At 18 rpm this motor travels faster than the 12 rpm references in the same family, which shortens the run time on a 9 ft drop. Pair the 18 rpm figure with your tube circumference and you get travel time before you order.

The minimum internal diameter of 1.85 in rules out small tubes. Standard LT50 and T5 class tubes clear it. Measure the inside of the tube, not the outside, and check for a seam weld that narrows the bore.

Shutters and awnings the DMI5Hz drives

Somfy lists this reference for awnings and rolling shutters. On an awning the crank override earns its place: a dealer can retract the arms by hand after a storm knocks out power, which protects the fabric and the frame. On a shutter the override gets the curtain up so the household keeps daylight and egress.

The motor runs on 120V AC at 60 Hz through a 19.69 ft white SJTW cable with three wires and stripped ends. An electrician lands it in a junction box or a Somfy enclosure. Mechanical limit switches hold the travel stops with a 28-turn capacity, which an installer sets with the two adjustment screws on the head before the shutter goes up.

Verified specs for the Simu DMI5Hz 2004672

Figures come from Somfy's published reference data for 2004672.

Crank override and the 7 mm hex shaft

The DMI designation marks the override. Somfy machines a 7 mm hex socket into the head, and a crank shaft engages it through the bracket plate. Turning the crank drives the tube through the same gearbox the motor uses, so the shutter tracks its guides at hand speed and the limits stay set.

Order the shaft to suit the distance between the motor head and the wall or fascia where the eye sits. The Simu extension shaft 7mm hex L=330mm with screw (9420659) covers a 13 in reach and ships with its fixing screw. Measure from the head face to the finished opening of the eye before you pick a length, and allow for the bracket thickness.

Dealers who fit the override on an awning should confirm the crank handle angle at the wall. A shaft that leaves the eye at a steep angle binds the universal joint and wears the pin.

Tube fit, crowns, drives and brackets

The motor body measures 1.77 in across, so the crown and drive carry the load between the motor and the tube wall. Somfy supplies T5 and T6 wheels in the profiles the shutter trade uses. The T5/T6 60mm Round Aluminum Drive (9012950) fits a 60 mm round tube, and the T5/T6 70mm Octagonal Aluminum Drive (9011878) fits the 70 mm octagonal tube common on larger shutter boxes. Both press onto the drive end and locate the tube wall against the gearbox output.

Head support comes from the DMI bracket range. The Simu DMI Bracket 1-Piece Round Adjustable Cast Plate (9420647) takes the CMO head and gives an adjustable round plate that suits a shutter box face or a header. Somfy also offers a 100 x 100 mm plate, a two-piece inside mount U and a three-piece outside mount, which gives a dealer a mounting answer for a tight box and for an exposed header.

LT50 crowns and drives extend the fit list further. A shop that stocks LT50 wheels can use them on this motor class, which keeps one bin of parts behind two motor lines.

Hz radio range and the parts to order with it

The built-in Hz receiver runs on 433.420 MHz and reaches 492.15 ft in open field. Walls and metal shutter boxes cut that figure, so plan a wall transmitter within the same room or a repeater on a long run. Somfy rates the open-field number as a ceiling, and a dealer should treat 30 to 50 ft through two interior walls as a working expectation in a house.

Pair the motor with Simu Hz transmitters. The Hz protocol runs its own pairing sequence from the transmitter, and the motor confirms with a short jog of the tube. Keep a record of which transmitter channel drives which opening on a multi-shutter job, because a dealer who skips that step pairs the same channel twice and loses independent control of one shutter.

The Simu DMI5Hz 25Nm 18rpm 120V (2004672) ships as the motor with its cable. Add the crown and drive your tube profile needs, a DMI bracket for the head, an override shaft at the length your opening calls for, and a Simu Hz transmitter for the room. Somfy backs the motor with a 5-year warranty and a UL approval, and the Hz receiver inside the head keeps the control wiring down to the 120V feed.

Questions dealers ask about the DMI5Hz 25 Nm

What tube does the Simu DMI5Hz 25 Nm motor fit?

Somfy publishes a minimum internal diameter of 1.85 in for reference 2004672. Standard 60 mm round and 70 mm octagonal shutter tubes clear that bore with the matching T5 or T6 drive wheel. Measure the tube inside diameter and check for a seam weld, since a raised weld bead can narrow the bore below the figure.

How far does the Hz radio reach?

Somfy rates the built-in Hz receiver at 492.15 ft in open field on 433.420 MHz. Inside a building the figure drops. A metal shutter box and low-e glass each absorb signal, so place a wall transmitter in the same room as the opening or add a repeater on a long horizontal run across a house.

Can I crank the shutter during a power outage?

Yes. The DMI head carries a 7 mm hex override port, and a crank shaft engaged in that port drives the tube by hand. The gearbox keeps the set limits while you crank, so the shutter returns to normal radio operation once power comes back with no limit reset needed.

Which brackets fit the CMO head on this motor?

The Somfy DMI bracket family takes this head: a one-piece round adjustable cast plate, a 100 x 100 mm plate, a two-piece inside mount adjustable U and a three-piece outside mount. Pick the plate that suits your shutter box face, and leave clearance for the override shaft to pass through the bracket.

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