Milwaukee's US name for the 3404-20 is M12 FUEL 1/2-inch Hammer Drill/Driver. Its product page describes a brushless motor, an all-metal chuck, and a mechanical clutch. The shared operator manual includes this model's hammer, drill, and drive controls. This introduction is based on those documents, without hands-on test claims. The 3404-20 has its own parts bulletin, 54-24-2260, listing starting serial M80A; do not select service parts solely because another drill looks similar.
Check before you follow
Identity & documentation.
- Brand
- Milwaukee
- Model
- 3404-20
- Tool type
- Cordless hammer drill/driver
- Market
- United States
- Catalog number
- 3404-20
- Bulletin starting serial
- M80A (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
The shared Milwaukee manual explicitly covers 3403-20 and 3404-20; hammer-drill instructions apply only to 3404-20.
Document revision: 09/22; 58143400d2; 961014300-02(A)
Printed code 58143400d2 / 961014300-02(A), 09/22; English/French/Spanish; shared with hammer model 3404-20.
Document checked
Keep the limits in view.
- No hands-on review or purchase recommendation
- Not a rotary-hammer performance claim
- Do not generalize masonry suitability beyond the model manual, bit and task requirements
- No claim that a parts diagram authorizes owner repair
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.
- 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 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.
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.
- Milwaukee Tool: US product page
Checked
- 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.
- Milwaukee Tool: Service parts bulletin for identity verification only 54-24-2260
Checked
Do not present the bulletin's internal service procedures as owner maintenance. Confirm catalog and serial applicability before using parts information.