The Milwaukee 3403-20 is listed in the US as the M12 FUEL 1/2-inch Drill/Driver. Milwaukee describes a brushless motor, an all-metal chuck, and a mechanical clutch. This documentation-based introduction explains the model identity and points owners to its operating instructions; it does not rate performance or durability. The operator manual also covers the 3404-20, so follow the sections labeled for your model. For service identification, the linked 3403-20 parts bulletin lists starting serial M79A.

Battery platform

M12

Controls and model distinctions

Two speeds; mechanical clutch; variable trigger; no hammer mode

Tool and package identity

The 3403-20 listing is tool-only, with battery and charger sold separately. The separately verified 3403-22 package lists: 3403-20 drill; 48-11-2440 M12 XC4.0 battery; 48-11-2420 M12 CP2.0 battery; 48-59-2401 charger; contractor bag.

Document applicability

Printed code 58143400d2 / 961014300-02(A), 09/22; English/French/Spanish; shared with hammer model 3404-20.

Check before you follow

Identity & documentation.

Brand
Milwaukee
Model
3403-20
Tool type
Cordless drill/driver
Market
United States
Catalog number
3403-20
US product listing
3403-20
Bulletin starting serial
M79A (confirm applicability)
Manual revision used
09/22; 58143400d2; 961014300-02(A)
Evidence level
Manufacturer documentation; no physical testing

A source check date records this research pass. It does not confirm that a manual is the newest possible revision, a tool is still in production, or a particular unit matches these documents.

Manuals & service references

Identify the right document.

These are document reference records, not downloadable manuals. Original manufacturer files are not provided here. Match the exact model and revision before use. A parts reference does not authorize internal repair.

Operator manualPDF

3403-20/3404-20 operator manual 58-14-3400d2

Model identified in this document

Printed code 58143400d2 / 961014300-02(A), 09/22; English/French/Spanish; shared with hammer model 3404-20.

Document revision: 09/22; 58143400d2; 961014300-02(A)

Document checked

Parts referencePDF

3403-20 service parts bulletin 54-06-2260

Model identified in this document

February 2022; starting serial M79A.

Document checked

Keep the limits in view.

  • No hands-on review or purchase recommendation
  • Do not apply 3404-20-only hammer instructions
  • Starting serial is a bulletin applicability identifier, not a complete serial-number match
  • No numeric torque, capacity, runtime, or lifespan claim is supplied
  • Documentation-based guide; no hands-on testing, durability ranking, or independent performance claim.
  • Manufacturer listing is live at check date; latest generation, stock, price and recall completeness not established.
  • Parts diagram is an identification/reference link, not authorization or instructions for owner internal repair.
  • Confirm full nameplate model, type or serial and region before selecting a document or service part.

Read the instructions for the tool and any applicable battery or charger together. Routine owner care stays outside the housing; internal service belongs with the manufacturer or an authorized service provider.

Keep reading

Milwaukee: explore this brand’s tool references

Guides for this model

Explore controls, comparisons and documentation for this exact model.

  • External care and service boundaries

    Aim for a dry grip, unobstructed vents and clean controls. Cracks, binding and an unreliable switch need more than cleaning.

  • When your drill won’t start

    Exclude danger and damage, check centre lock and battery retention, then interpret the exact model. On 3403/3404, one light flashing four times, eight times and a hot-pack indication are not interchangeable.

  • Milwaukee: platform before mode

    Existing M12 small-hole users can start with 3403; tight-access M18 users with 3601. Larger wood holes or suitable masonry can justify 2904 bulk.

  • Match the right manual

    Record model, Type/service identifier, market and document revision separately. Download availability today does not automatically establish applicability to your unit.

  • Drill, drive or hammer?

    3403-20 has drilling and clutch driving; 3404-20 adds hammer drilling. Mode, mechanical gear and trigger speed are separate settings.

  • 3403 clutch and mode

    Use mechanical speed 1 and numbered clutch settings for a screw-driving trial. The drill symbol is for drilling, not finer clutch adjustment. 3403-20 does not have 3404-20 hammer action.

  • 3403 or 3404?

    Choose furniture, wood and metal work by access and complete cost; hammer mode helps only when material, hole size and site conditions suit it.

  • Choose M12 or M18

    Existing equipment can avoid duplicate purchases, not replace capability checks. The 48-59-1812 charges both families but does not make their packs interchangeable.

  • Milwaukee service identity

    Record full catalog and serial numbers, then compare the bulletin header and date; an R filename does not replace revision matching.

  • Milwaukee kit contents

    3403 pairs 4Ah with 2Ah, 3601 supplies two 2Ah packs, and 2904 two 5Ah packs. Deduct usable equipment already owned before comparing complete cost.

The reading behind this guide

Source records describe the evidence used for this guide. Original manufacturer files and external videos are not provided here.

Sources & references.

Manufacturer documents and public safety references are the starting point. Check each source’s scope and confirm the exact model, market, and revision for your tool.

  1. Milwaukee Tool: 3403-20 US product listing

    Checked

    Document checked

    Listed at check time; not a stock check, discontinuation audit, or claim to be newest generation.

  2. Milwaukee Tool: 3403-20/3404-20 operator manual 58-14-3400d2 58-14-3400d2

    Revision 09/22; 58143400d2; 961014300-02(A) · Checked · Pages Full20-page PDF downloaded. Printed3 capacities and RPM/BPM; BPM table No Load versus symbol Under Load condition conflict retained, not equal-load ranking.

    Document checked

    Only 3403-20 and 3404-20. Indicators and control behavior must not be generalized to Bosch or other drills.

  3. Milwaukee Tool: 3403-20 service parts bulletin 54-06-2260 54-06-2260

    Checked

    Document checked

    Do not present the bulletin's internal service procedures as owner maintenance. Confirm catalog and serial applicability before using parts information.

  4. Milwaukee Tool: 3403-22 US kit listing

    Checked

    Document checked

    Pack contents are specific to this listing; do not decode all suffixes from these examples.