Product Description
**Milwaukee parts change not only by model# but also by serial number. To look up your tools parts break down on Milwaukee's website please click here:
Milwaukee 120V Armature
Model Number: 16-70-0320
The Milwaukee 16-70-0320 120V Armature is a genuine OEM replacement service part used across Milwaukee's corded electric drill and Dymodrill families, including several of Milwaukee's largest and heaviest-duty corded drills used in concrete core drilling, heavy-duty magnetic drilling, and industrial drilling applications. The armature is the central rotating component of the drill's universal (brushed) AC motor, comprising the laminated steel shaft core, insulated copper windings, and commutator segments through which the two carbon brushes transfer electrical current from the field windings into the rotating assembly. As the armature rotates within the stationary magnetic field produced by the field windings, the interaction between the rotating and stationary magnetic fields produces the torque that drives the drill's gear train and ultimately the chuck. The 120V rating confirms this armature is wound to the correct specification for operation at North American line voltage, delivering the correct motor speed, torque, and current draw at 120V AC. Confirmed cross-platform compatibility includes the Milwaukee 4004 Dymodrill (serial codes 841A and 841B), 4004-20, 4004-20LC (serial G70a), 4004-55 Dymodrill, 4005 Dymodrill (serial codes 865A and 865B), 4005-55, 4014 Dymodrill, 4015 Cordless Drill/Driver, 4079 Electric Drill (serial codes 738-1001, 738A, 738B), 4093 Electric Drill, 4094 Electric Drill (serial codes 740-1001, 740A, 740B), 4096 Electric Drill (serial codes 798-1001, 798A, 798B, 798C), 4096-55, and 4099 Electric Drill (serial codes 742-1001, 742A, 742B).
Because the armature commutator is in constant sliding contact with the carbon brushes throughout the motor's service life, the commutator surface progressively wears down and eventually reaches the point where the copper segments are worn below usable thickness, or arcing between segments has damaged the insulation between them. Symptoms of a failing armature include reduced motor power, excessive arcing at the brushes (visible as bright sparking during operation), the motor running hotter than normal, unusual noise or vibration from the motor, or the motor failing to start entirely. When the armature fails, replacement of both carbon brushes is required at the same service - the old brushes have worn to match the old commutator profile and will not seat correctly against the new armature's fresh commutator surface without accelerated re-wear. Carbon brushes are sold individually, most motors require 2, replace both at the same time. Refer to the specific tool's parts diagram for the correct carbon brush part number, since the carbon brushes for the 16-70-0320 armature vary by Milwaukee tool model in this fitment list. The companion armature bearings should also be inspected during armature service and replaced if worn or noisy. Because Milwaukee Tool specifies replacement parts by both catalog number and serial number, always verify your tool's serial number against the official Milwaukee service parts diagram before ordering. Milwaukee uses several different 120V armature part numbers across their corded tool catalog (including 16-70-0055, 16-70-0300, and 16-70-0330), all of which are NOT interchangeable with the 16-70-0320 due to different winding specifications, commutator dimensions, and shaft configurations. Verify by serial number using Milwaukee's online parts lookup before ordering to confirm correct fitment.
Features
- Genuine Milwaukee OEM replacement 120V armature, direct factory part for the 16-70-0320 reference
- Complete rotating motor assembly with laminated steel shaft core, insulated copper windings, and commutator segments
- Wound to Milwaukee's specification for 120V AC operation at North American line voltage
- Cross-platform compatibility across Milwaukee's large corded electric drill and Dymodrill family
- Confirmed fitment on the Milwaukee 4004, 4004-20, 4004-20LC, 4004-55, 4005, 4005-55 Dymodrill platforms
- Confirmed fitment on the Milwaukee 4014 Dymodrill and 4015 Cordless Drill/Driver
- Confirmed fitment on the Milwaukee 4079, 4093, 4094, 4096, 4096-55, and 4099 Electric Drills
- Restores full motor performance after armature failure from commutator wear or winding damage
- Correct commutator dimensions for the carbon brush interface on compatible tools
- Manufactured to Milwaukee's original electrical, mechanical, and dimensional specifications
- Direct-fit replacement, no modification required for installation
- Sold individually as a single armature assembly
- Item weight 3.13 lb
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 16-70-0320
- Official Description: 120V Armature
- Component Type: Universal AC Motor Armature Assembly
- Voltage Rating: 120V AC
- Primary Fitment: Milwaukee 4004, 4004-20, 4004-20LC, 4004-55, 4005, 4005-55, 4014 Dymodrills; 4015 Cordless Drill/Driver; 4079, 4093, 4094, 4096, 4096-55, 4099 Electric Drills (verify by serial number)
- Also Referenced On: eReplacementParts, Fix.com, Biedlers, PartSelect, Amazon
- Assembly Components: Laminated steel shaft, insulated copper windings, commutator segments
- Item Weight: 3.13 lb
- Quantity: Sold individually, 1 armature per order
- Part Type: OEM Service Replacement Part
Includes
- (1) Milwaukee 16-70-0320 120V Armature
- NOT Included: Carbon brushes - required for a proper motor service and NOT interchangeable across the 16-70-0320 fitment list. Carbon brushes are sold individually, most motors require 2, replace both at the same time. Refer to your specific tool's parts diagram for the correct carbon brush part numbers
- NOT Included: Armature bearings, brush tubes, brush springs, or motor housing hardware. Inspect these companion components during armature service and refer to the tool's parts diagram for the correct part numbers, sold separately
- Note: This armature is NOT interchangeable with the closely-numbered Milwaukee 16-70-0055, 16-70-0300, or 16-70-0330 120V Armatures, which serve different Milwaukee corded tool platforms
- Note: Verify your tool's catalog number and serial number against the official Milwaukee parts diagram before ordering
