Milwaukee 4004-20 20A 2-Speed Diamond Core Motor (Clutch) Specs & Compatibility

VERIFIED SPECIFICATION · ACTIVE · Last verified 2026-09-05

14" stand-mounted rig concrete core drill

Maximum diameter: 14"
Power: 2400W
Voltage: 120V AC, 60 Hz
Speeds: 300 / 600 RPM
Spindle: 1-1/4"-7 UNC Male
Handheld: No
Stand capable: Yes
Wet drilling: Yes
Dry drilling: No
Safety clutch: Unknown / Not specified by manufacturer
Machine weight: 24.0 lb

Values are taken from manufacturer documentation and official manuals where cited in Sources. Gear 1: 300 RPM, Gear 2: 600 RPM

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Decision Summary

Specification analysis for Milwaukee 4004 based on verified manufacturer manuals and operator documentation.

✓ Best Suited For

Contractors, core drilling specialists, and trades requiring documented core drilling capacity with verified bit compatibility.

✕ Who Should Skip

Operators requiring larger commercial diameters beyond machine rating, or standard rotary hammer SDS drilling.

Verified specification table

Specification	Value	Source status
Maximum diameter	14"	Manufacturer verified
Voltage	120V AC, 60 Hz	Manufacturer verified
Power	2400W	Manufacturer verified
Low gear / min RPM	300	Manual verified
High gear / max RPM	600	Manual verified
Spindle	1-1/4"-7 UNC Male	Manual verified
Handheld	No	Manual verified
Stand capable	Yes	Manual verified
Safety clutch	Unknown / Not specified by manufacturer	not listed
Water feed	Unknown / Not specified by manufacturer	not listed
Wet drilling	Yes	Manufacturer verified
Dry drilling	No	Manufacturer verified
Reinforced concrete	Unknown / Not specified by manufacturer	not listed
Machine / net weight	24.0 lb	Manufacturer verified

Source links appear in Sources & Verification below, not invented ratings.

Bit & Rig Compatibility

Spindle interface, bit connection standards, and rig pairing documentation.

Spindle Connection: 1-1/4"-7 UNC Male

This machine utilizes a 1-1/4"-7 UNC Male spindle. Diamond core bits matching this connection thread directly without adapters. Mismatched threads require a documented rigid arbor adapter.

Compatible core bits

Mechanical fit is not the same as a safe operating-speed fit. Bit published max RPM wins when lower than the machine gear.

SPEC-MATCHED 🟡

Hilti SPX-L Heavy Rebar Wet Core Bits 1/2″

SPEC-MATCHED 🟡

Connection Hilti BL Quick-Release / 1-1/4"-7 UNC ✓
Diameter 0.5" ✓
Machine capacity 14"
Method Wet
OEM pairing Not OEM-documented
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Not OEM-documented

View Bit Details Check RPM

Milwaukee 48-17-5006 0.625″ Diamond Core Bit

SPEC-MATCHED 🟡

Connection 1-1/4"-7 UNC Female ✓
Diameter 0.625" ✓
Machine capacity 14"
Method Wet
OEM pairing Not OEM-documented
Mechanical fit Aligned
Operating speed Within published range
OEM fit Not OEM-documented

View Bit Details Check RPM

Milwaukee 48-17-5007 0.75″ Diamond Core Bit

SPEC-MATCHED 🟡

Connection 1-1/4"-7 UNC Female ✓
Diameter 0.75" ✓
Machine capacity 14"
Method Wet
OEM pairing Not OEM-documented
Mechanical fit Aligned
Operating speed Within published range
OEM fit Not OEM-documented

View Bit Details Check RPM

Milwaukee 48-17-5009 0.875″ Diamond Core Bit

SPEC-MATCHED 🟡

Connection 1-1/4"-7 UNC Female ✓
Diameter 0.875" ✓
Machine capacity 14"
Method Wet
OEM pairing Not OEM-documented
Mechanical fit Aligned
Operating speed Within published range
OEM fit Not OEM-documented

View Bit Details Check RPM

BLUEROCK Wet 1″ Diamond Core Bit

SPEC-MATCHED 🟡

Connection 1-1/4"-7 UNC Female ✓
Diameter 1" ✓
Machine capacity 14"
Method Wet
OEM pairing Not OEM-documented
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Not OEM-documented

View Bit Details Check RPM

Hilti SPX-L Heavy Rebar Wet Core Bits 1″

SPEC-MATCHED 🟡

Connection Hilti BL Quick-Release / 1-1/4"-7 UNC ✓
Diameter 1" ✓
Machine capacity 14"
Method Wet
OEM pairing Not OEM-documented
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Not OEM-documented

View Bit Details Check RPM

Milwaukee 48-17-5010 1″ Diamond Core Bit

SPEC-MATCHED 🟡

Connection 1-1/4"-7 UNC Female ✓
Diameter 1" ✓
Machine capacity 14"
Method Wet
OEM pairing Not OEM-documented
Mechanical fit Aligned
Operating speed Within published range
OEM fit Not OEM-documented

View Bit Details Check RPM

Diamond Products Core Bore Premium Black Wet Core Bits 1-1/2″

SPEC-MATCHED 🟡

Connection 1-1/4"-7 UNC Female ✓
Diameter 1.5" ✓
Machine capacity 14"
Method Wet
OEM pairing Not OEM-documented
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Not OEM-documented

View Bit Details Check RPM

Find more compatible bits

RPM / gear guidance

Gear 1: 300 RPM, Gear 2: 600 RPM

Documented RPM: 300 / 600

Open RPM Calculator

Stand / adapter compatibility

Stand model: Unknown / Not specified by manufacturer
Stand compatibility: Milwaukee 4120 / 4130 Dymorig stands
Adapter requirements: Unknown / Not specified by manufacturer
Adapter support: Unknown / Not specified by manufacturer

Water / slurry / dust

No evidence-backed water or dust accessory edges stored for this motor yet, do not invent recommendations.

Jobsite Setup & Operation

Operational workflow, slurry/water management, mounting procedures, and operator safety.

Water / slurry / dust

No evidence-backed water or dust accessory edges stored for this motor yet, do not invent recommendations.

Ownership & Service

Serviceability not verified for this model yet, fields remain UNKNOWN (not “parts unavailable”).

Authoritative Sources & Verification

CoringSpec specifications are extracted directly from primary manufacturer documentation and operator manuals. We do not invent lab scores or extrapolate unverified ratings.

Verified Documentation

Milwaukee Electric Tool Corp. 4004-20 Heavy Cor-Meter Manual (External Source)

Research & Verification Standards: This equipment profile was audited and verified against primary manufacturer technical documentation by the CoringSpec Technical Editorial Team. Specifications confirmed active as of 2026-09-05.

Read Our Research Methodology · Report a Specification Correction