Ralli Wolf RDD250 Diamond Core Drill – Stand Mounted, 12–255 mm, 4250 W, 560 rpm

The Ralli Wolf RDD250 is the largest core drill in Ralli Wolf's range: a 4250 W rig-mounted machine for cores of 12 to 255 mm in concrete, at 560 rpm. It runs on a 900 mm column with a feed handle and takes bits on a 1-1/4-inch UNC spindle. Use it for big service openings in slabs and walls — HVAC ducts, drainage and large pipes. Net weight is 24 kg.

At a glance

• Core size: 12–255 mm
• Power: 4250 W
• Speed: 560 rpm
• Spindle: 1-1/4" UNC
• Weight: 24 kg

Why choose the RDD250

• The largest core capacity in the range — up to 255 mm
• Rig-mounted motor on a 900 mm column with feed handle
• Ralli Wolf — an Indian power-tool maker with more than 60 years in the trade. Ralli Wolf Industries Ltd. began in technical collaboration with Wolf of the UK, makes its tools at an ISO 9001:2015 certified plant in MIDC Ahmednagar, Maharashtra, and backs them with more than 30 service locations across India.

Specifications

• Model: RDD250
• Product: Ralli Wolf Diamond Core Drill
• Rated power: 4250 W
• Rated voltage: 230 V, 50 Hz
• No-load speed: 560 rpm
• Drilling capacity: 12–255 mm diameter
• Spindle thread: 1-1/4-inch UNC (male)
• Column length: 900 mm
• Net weight: 24 kg
• Brand: Ralli Wolf (Ralli Wolf Industries Ltd., India)

Wet core drilling basics

Diamond core drilling cuts a clean round hole through concrete, brick and stone by grinding an annular groove and lifting out the core. Run water through the bit to cool it and flush the slurry. Handheld machines suit smaller holes; stand-mounted rigs anchored to the floor or wall give the stability and feed control that large-diameter cores need. Choose the bit diameter for the pipe or cable plus clearance.

Where it is used

• Openings for pipes, ducts and cable entries
• HVAC and plumbing penetrations
• Anchor holes and test cores in concrete

Which Ralli Wolf diamond core drill is right for you?

• RDD110 — Handheld, 12–110 mm, 2080 W, 0–2100 rpm
• RDD200 — Stand Mounted, 12–205 mm, 3900 W, 580 rpm
• RDD250 (this page) — Stand Mounted, 12–255 mm, 4250 W, 560 rpm
• See all Ralli Wolf diamond core drills

Related products

• Ralli Wolf rotary and demolition hammers
• Ralli Wolf marble cutters
• Ralli Wolf concrete vibrators

Frequently asked questions

Which should I choose — the RDD250 or the RDD200?

Choose the RDD250 for cores above 205 mm (up to 255 mm, 4250 W); the Ralli Wolf RDD200 (3900 W, 20.5 kg) covers up to 205 mm.

What hole sizes can the RDD250 drill?

Cores of 12–255 mm diameter in concrete, brick and stone, with the matching diamond core bit.

Does the RDD250 drill wet or dry?

Diamond core drills like this are run wet: water cools the bit and flushes the slurry, which makes the bit last longer and cut faster.

What is the price of the Ralli Wolf RDD250, and where can I buy it?

Prices depend on quantity and current Ralli Wolf pricing, so they are quoted on request. Jai Enterprises supplies Ralli Wolf tools from Bhilai and Raipur, Chhattisgarh, to sites across India — call +91 9340081159 or send an enquiry from this page with the quantity and delivery location.

How to order

Supplied by Jai Enterprises, despatched from Bhilai and Raipur, Chhattisgarh, to sites across India. To request a price, call +91 9340081159 or send an enquiry from this page with your quantity and site details, and we will confirm availability, lead time and the right model for the job.