LiftMaster Model MJ

Medium-duty jackshaft — for lighter commercial doors with mid-range cycles. Max 12 cycles/hour · under 50/day · 1/2 HP 115V.

Call 901-598-7979 for a commercial quote

LiftMaster commercial · Installed by Advanced Garage Door

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LiftMaster Model MJ — tap to enlarge.

Overview

About the LiftMaster Model MJ

The LiftMaster Model MJ is a medium-duty jackshaft operator for smaller, lighter commercial doors with mid-range duty cycles. Rated maximum 12 cycles per hour and less than 50 cycles per day — not the same industrial 25/hour package as J/H. Wall-mount for high or vertical lift sectionals or small rolling doors and grilles. Includes a floor-level disconnect for emergency manual lifting (not the full industrial chain-hoist package of the H). Power: 1/2 HP, 115V single-phase.

Duty class: Medium-duty jackshaft · Medium-Duty Logic
How you buy it: Quoted and installed by Advanced Garage Door — Memphis-area commercial install

Specifications (LiftMaster)

	LiftMaster Model MJ
Style	Medium-duty jackshaft
Logic / series	Medium-duty commercial (not Logic 5.0 industrial)
Primary use	Smaller/lighter commercial doors — high/vertical lift sectionals or small rolling/grilles
Mounting	Wall mount
Rated duty cycle	Maximum 12 cycles per hour; less than 50 cycles per day
Horsepower / voltage	1/2 HP · 115V single-phase
Control circuit	24V NEC Class 2
Manual operation	Floor-level disconnect for emergency manual lifting
Safety	Meets UL 325 · commercial photo eyes · timer-to-close 5–60 seconds
Radio	Built-in 3-channel Security+ receiver (up to 20 remotes @ 315 MHz)

Source: LiftMaster commercial product data. HP, voltage, and options are confirmed on your written quote.

Features

Medium-duty rating — lighter cycle package than industrial J/H
1/2 HP 115V — simple single-phase jobs
Floor-level disconnect for emergency hand lift
UL 325 · timer-to-close · commercial photo eyes as specified

When to choose medium-duty jackshaft (MJ)

Pick MJ for lighter commercial openings that do not need industrial Logic 5.0 duty. Need a chain hoist on medium-duty? See MH. Standard-lift sectionals at medium duty? See MT.