BLUEROCK 4Z1 Specs, Capacity and Compatible Core Bits

VERIFIED SPECIFICATION · ACTIVE · Last verified 2026-08-22

4" handheld & stand-mounted concrete core drill

Maximum diameter: 4"
Power: 1500W
Voltage: 110V, 50, 60 Hz, single phase
Speeds: 950 / 2100 RPM
Spindle: 1-1/4"-7 UNC
Handheld: Yes
Stand capable: Yes
Wet drilling: Yes
Dry drilling: Yes
Safety clutch: Yes
Machine weight: Not clearly specified by manufacturer

Values are taken from manufacturer documentation and official manuals where cited in Sources. Gear 2: 2100 rpm for 1", 2" bits; Gear 1: 950 rpm for 2", 4" bits (BLUEROCK 4Z1 OM)

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Decision Summary

Specification analysis for BLUEROCK 4Z1 based on verified manufacturer manuals and operator documentation.

✓ Best Suited For

Budget handheld (optional stand) for 1", 4" holes in concrete, block, brick, or asphalt.

✕ Who Should Skip

You need to drill holes larger than 4 inches, or require continuous deep core drilling through heavily reinforced structural footings.

Verified specification table

Specification	Value	Source status
Maximum diameter	4"	Manufacturer verified
Voltage	110V, 50, 60 Hz, single phase	Manufacturer verified
Power	1500W	Manufacturer verified
Low gear / min RPM	950	Manual verified
High gear / max RPM	2100	Manual verified
Spindle	1-1/4"-7 UNC	Manual verified
Handheld	Yes	Manual verified
Stand capable	Yes	Manual verified
Safety clutch	Yes	Manual verified
Water feed	Yes	Manual verified
Wet drilling	Yes	Manufacturer verified
Dry drilling	Yes	Manufacturer verified
Reinforced concrete	Yes	Manufacturer verified
Machine / net weight	Not clearly specified by manufacturer	Definition conflict, not published as machine weight
Shipping weight	22 lb	Manual / listing (shipping)
Weight definition	Manual lists 22 lb shipping weight; marketplace product-page weight fields differ. Machine/net weight is not clearly identified by the manufacturer.

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

This machine utilizes a 1-1/4"-7 UNC 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.

VERIFIED FIT ✅

BLUEROCK Wet 1″ Diamond Core Bit

VERIFIED FIT ✅

Connection 1-1/4"-7 UNC Female ✓
Diameter 1" ✓
Machine capacity 4"
Method Wet
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

BLUEROCK Wet 2″ Diamond Core Bit

VERIFIED FIT ✅

Connection 1-1/4"-7 UNC Female ✓
Diameter 2" ✓
Machine capacity 4"
Method Wet
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

BLUEROCK Wet 3″ Diamond Core Bit

VERIFIED FIT ✅

Connection 1-1/4"-7 UNC Female ✓
Diameter 3" ✓
Machine capacity 4"
Method Wet
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

BLUEROCK Wet 4″ Diamond Core Bit

VERIFIED FIT ✅

Connection 1-1/4"-7 UNC Female ✓
Diameter 4" ✓
Machine capacity 4"
Method Wet
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

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 4"
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 4"
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 4"
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 4"
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

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 4"
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 4"
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

Husqvarna VARI-DRILL Dry D20 Core Bits 1-1/4″

SPEC-MATCHED 🟡

Connection 5/8"-11 UNC & 1-1/4"-7 UNC ✓
Diameter 1.25" ✓
Machine capacity 4"
Method Dry
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 48-17-0112 1.25″ Diamond Core Bit

SPEC-MATCHED 🟡

Connection 1-1/4"-7 UNC ✓
Diameter 1.25" ✓
Machine capacity 4"
Method Dry
OEM pairing Not OEM-documented
Mechanical fit Aligned
Operating speed Within published range
OEM fit Not OEM-documented

View Bit Details Check RPM

ADAPTER REQUIRED 🟠

BLUEROCK Dry 1″ Diamond Core Bit

ADAPTER REQUIRED 🟠

Connection 5/8"-11 UNC ✓
Diameter 1" ✓
Machine capacity 4"
Method Dry
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

BLUEROCK Dry 1.25″ Diamond Core Bit

ADAPTER REQUIRED 🟠

Connection 5/8"-11 UNC ✓
Diameter 1.25" ✓
Machine capacity 4"
Method Dry
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

BLUEROCK Dry 1.5″ Diamond Core Bit

ADAPTER REQUIRED 🟠

Connection 5/8"-11 UNC ✓
Diameter 1.5" ✓
Machine capacity 4"
Method Dry
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

BLUEROCK Dry 2″ Diamond Core Bit

ADAPTER REQUIRED 🟠

Connection 5/8"-11 UNC ✓
Diameter 2" ✓
Machine capacity 4"
Method Dry
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

BLUEROCK Dry 2.5″ Diamond Core Bit

ADAPTER REQUIRED 🟠

Connection 5/8"-11 UNC ✓
Diameter 2.5" ✓
Machine capacity 4"
Method Dry
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

BLUEROCK Dry 3″ Diamond Core Bit

ADAPTER REQUIRED 🟠

Connection 5/8"-11 UNC ✓
Diameter 3" ✓
Machine capacity 4"
Method Dry
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

BLUEROCK Dry 4″ Diamond Core Bit

ADAPTER REQUIRED 🟠

Connection 5/8"-11 UNC ✓
Diameter 4" ✓
Machine capacity 4"
Method Dry
OEM pairing Verified ✓
Mechanical fit Aligned
Operating speed Unknown / incomplete RPM data
OEM fit Verified ✓

View Bit Details Check RPM

Find more compatible bits

RPM / gear guidance

Gear 2: 2100 rpm for 1", 2" bits; Gear 1: 950 rpm for 2", 4" bits (BLUEROCK 4Z1 OM)

Recommended machine gear by hole size

Diameter	Manufacturer gear
1" to 2"	2100 RPM
2" to 4"	950 RPM

From the BLUEROCK 4Z1 operational manual. When a bit publishes a lower max RPM, the bit limit wins.

Open RPM Calculator

Stand / adapter compatibility

Stand model: 4"Z1 Drill Rig Stand (optional, sold separately)
Stand compatibility: Manual: drill fits C-clamp assembly on optional rig; wedge anchors required
OEM / documented stands:
- bluerock-4z1-drill-rig-stand, OEM verified (Optional OEM 4Z1 rig stand path)
Adapter requirements: Optional BLUEROCK 4"Z1 drill rig stand sold separately
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

Lifecycle status: CURRENT
Warranty evidence: Warranty documented, 30-day limited warranty per BLUEROCK business policy, confirm current page; optional 12-month extended parts warranty sold separately (
OEM service: OEM service available, OEM service/support via BLUEROCK Tools customer support (manufacturer channel).
Replacement parts status: OEM part available
Not verified: specific replacement SKUs not confirmed in current OEM documentation for this model.
Last serviceability verification: 2026-08-21

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

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 2026-08-22.

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