Sutton H125 102mm Bi-Metal Cobalt M42 Holesaw

The Sutton H125 is a 102mm holesaw, the 4 inch size, made from bi-metal cobalt HSS and built for the large round penetrations that smaller saws cannot manage. It cuts to a 32mm depth and suits machine or hand drilling in steel, stainless steel, cast iron, non-ferrous metals, plastic and wood. This is a heavy saw, so the listing puts it on the UA3 or QFX arbor class with a BD24 or BD26 pilot, and it wants a drill with the torque to keep the big rim cutting.

Key Features

• Bi-metal cobalt HSS for toughness and longer life
• 32mm cutting depth
• International thread standard accepts all standard arbors
• Listed for the UA3 or QFX arbor for a strong mount
• Suits machine or hand held drilling
• Cuts steel, stainless steel, cast iron, non-ferrous metals, plastic and wood

Specifications

• Diameter: 102mm (4 inch)
• Model: H125, white label series
• Material: bi-metal cobalt HSS
• Cutting depth: 32mm
• Thread: international thread standard
• Arbor and pilot: UA3 or QFX arbor, BD24 or BD26 pilot drill

Applications

• Large vent and fan holes through roofs and walls
• Exhaust and ducting penetrations
• Big pipe entries through floors
• Access holes in timber and metal panels
• Commercial and industrial fitouts

What You Need To Complete The Job

A 102mm saw needs a solid setup. Fit it to a Sutton quick fit arbor with a BD26 pilot drill and use a drill with strong low-end torque. In metal, use a cutting lubricant; for masonry, switch to an SDS masonry drill. More cutting gear lives under Carpentry Tools.

Frequently Asked Questions

What drill do I need for a 4 inch holesaw?

At 102mm the saw has a large rim and a lot of tooth contact, so it needs a drill with real low-speed torque, ideally a corded drill or a heavy 18V cordless. Run at a moderate speed and let the saw cut at its own pace. A pillar drill is the best option for repeat holes.

Can this saw cut through roof metal?

Yes. It is a common choice for cutting large vent and exhaust holes through steel roofing and wall cladding. The bi-metal teeth handle the sheet steel cleanly, and the 32mm depth covers the single skin panels used on most roofs.

Why does a big holesaw need the UA3 or QFX arbor?

A 102mm saw pulls much harder than a 19mm one, so it needs the stronger arbor class to hold it square and stop it flexing on the start. The UA3 and QFX arbors have the heavier shank and drive engagement that keep a large saw running true.

How do I stop the saw walking before it bites?

The pilot drill does that job. With a sharp BD24 or BD26 pilot and the saw running square to the work, the pilot bites first and holds the centre while the rim starts cutting. Start slowly until the rim teeth have a full circle of contact, then feed normally.