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Holesaws and Accessories
Holesaws and Accessories (also known as Hole Saw, Bi-Metal Cobalt Holesaw or Cup Saw) are Bi-Metal Cobalt holesaws and matching arbors for large-diameter clean holes in steel, stainless, timber and plastic. BNA stocks 71+ of these ex stock from our Brisbane warehouse, covering the full range of diameters, lengths and shank styles that engineers, tradies, manufacturers and DIY users need for everyday drilling tasks. Same-day dispatch on online orders placed before 1pm.
Also known as: Hole Saw, Bi-Metal Cobalt Holesaw, Cup Saw.
Drill Bit Construction & Materials
Bi-Metal Cobalt Tooth The cutting teeth are an HSS Cobalt edge bonded to a tough spring-steel body via electron-beam welding. Cobalt content lifts operating temperature to ~700 degrees C, which is what enables continuous cutting in stainless without dulling.
Spring Steel Body The cup body is heat-treated spring steel. Tough enough to flex under the cut without cracking, hard enough to resist wear from chip contact. Most BNA holesaws have a heat-blued body finish.
HSS Pilot Drill The pilot drill in the centre of the arbor is standard HSS jobber stock, sized 6mm or 6.35mm typically. Replaceable when it snaps; the holesaw itself usually outlasts several pilots.
Hardened Arbor The arbor that mounts the holesaw on the drill chuck is heat-treated through-hardened steel. The threaded mount on top accepts the 1/2-20 (or similar) thread on the holesaw cup.
Drive & Use
Mount the holesaw onto the arbor (right-hand thread, hand-tight is fine — the cutting action keeps it engaged). The pilot drill threads into the arbor centre. The whole assembly mounts in the drill chuck.
RPM is roughly half what a twist drill at the same diameter would run. Cup teeth take a much longer cut path per revolution and overheat quickly. A 32mm holesaw in steel runs ~500-700 RPM; a 76mm holesaw runs 200-300 RPM.
Withdraw every 5mm-10mm of cut to clear chips out of the cup. Otherwise the slug binds, the saw stalls, and the drill jerks the operator. A few drops of cutting fluid on the cut keeps teeth sharp longer.
Stainless and hardened steel: use fluid, run slow, don't push hard. The cobalt teeth are made for stainless. Standard HSS holesaws die in stainless within a hole or two.
Removing the slug: the pilot drill hole gives a screwdriver something to lever against. Push the slug out from the back through the chip-clearing slots in the cup. Don't try to chisel it out by hand — the teeth are sharp and the slug is hot.
Sizing & Measurements
Diameter range 14mm to 114mm+ in standard step intervals. Common installer sizes (16mm, 20mm, 25mm, 32mm, 38mm, 51mm, 65mm, 76mm) stocked in depth.
Length range Cup depth is typically 38mm-43mm so the saw will cut through standard sheet metal, plywood, MDF and timber up to about 38mm thick in one pass. Deeper-cup variants exist for joists.
Shank The HOLESAW itself threads onto an arbor. The ARBOR has a quick-release hex shank or a round shank, depending on style. Hex shank fits impact drivers and quick-change holders. Round shank fits standard drill chucks.
For pipe and conduit penetrations, check the actual OD (not the nominal pipe size) and add 1mm-2mm clearance. Nominal 25mm pipe is often 33.4mm OD.
For electrical glands and bushings, the manufacturer prints the hole size on the box. Common: 20mm gland needs a 20.5mm holesaw; 25mm gland needs a 25.5mm holesaw.
For bolt clearance through panels, holesaw diameter = bolt diameter plus 0.5mm-1mm. M16 bolt = 16.5mm-17mm holesaw.
WHY AUSTRALIA TRUSTS BOLT & NUT
With 15+ years selling fasteners and drilling tools online from Brisbane, we hold over 25,000 stock lines and 200 million pieces. 98.75% of online orders placed before 1pm leave same day. Save more as you buy more — we offer up to 13 price breaks plus 3 spend-tier discounts. Read our customer reviews or get in touch if you need help picking the right drill bit, holesaw or set for the job.
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71+ holesaws and accessories ex stock Brisbane: Bi-Metal Cobalt holesaws and matching arbors for large-diameter clean holes in steel, stainless, timber and plastic. Same-day dispatch on orders before 1pm.
TECHNICAL RESOURCES
CAD drawings showing how to identify and measure each variant: Holesaw · HSS Arbor Pilot Drill Bit PLD1 · HSS Arbor Pilot Drill Bit PLD2 · Quick Release Hex Shank Holesaw Arbor ARB1 · Quick Release Hex Shank Holesaw Arbor ARB2.
For the full library of dimensioned PDFs and CAD references, see our Technical PDF's Library.
We've been supplying these online from Brisbane for over 15 years. With 25,000 stock lines and over 200 million pieces in stock, we carry one of the most comprehensive ranges of drill bits and drilling tools available in Australia — from 1mm jobber bits to 114mm cobalt holesaws, from masonry SDS Plus to timber augers, from sets to single bits. Save more as you buy more — we offer up to 13 price breaks plus 3 spend-tier discounts.
