Hilti DD 120 Compact Rig Diamond Core Drill Specs & Compatibility

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

6.375" stand-mounted rig concrete core drill

Maximum diameter: 6.375"
Power: 1600W
Voltage: 120V / 230V, 50/60 Hz
Speeds: 650 / 1380 RPM
Spindle: Hilti DD-BI / BI+ Quick-Release (Proprietary)
Handheld: No
Stand capable: Yes
Wet drilling: Yes
Dry drilling: No
Safety clutch: Unknown / Not specified by manufacturer
Machine weight: 23.1 lb

Values are taken from manufacturer documentation and official manuals where cited in Sources. Gear 1: 650 RPM, Gear 2: 1380 RPM

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Decision Summary

Specification analysis for Hilti DD 120 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	6.375"	Manufacturer verified
Voltage	120V / 230V, 50/60 Hz	Manufacturer verified
Power	1600W	Manufacturer verified
Low gear / min RPM	650	Manual verified
High gear / max RPM	1380	Manual verified
Spindle	Hilti DD-BI / BI+ Quick-Release (Proprietary)	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	23.1 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: Hilti DD-BI / BI+ Quick-Release (Proprietary)

This machine utilizes a Hilti DD-BI / BI+ Quick-Release (Proprietary) 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 6.375"
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 6.375"
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 6.375"
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 6.375"
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 6.375"
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 6.375"
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 6.375"
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 6.375"
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: 650 RPM, Gear 2: 1380 RPM

Documented RPM: 650 / 1380

Open RPM Calculator

Stand / adapter compatibility

Stand model: Unknown / Not specified by manufacturer
Stand compatibility: Hilti DD-ST 120 compact stand (integrated column)
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

Hilti DD 120 Compact Coring System 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