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| Brand Name: | XRTOOLS |
| Model Number: | 80MM |
| MOQ: | 500PCS |
| Price: | $0.35-22/PCS |
| Delivery Time: | 30-35 days |
| Payment Terms: | L/C, T/T, D/P, Western Union, MoneyGram |
When your job demands a clean, accurate 80mm (3-5/32″) opening, standard hole saws fail – they wobble, overheat, and leave ragged burrs.
Our M42 Cobalt Series is engineered for professionals who cut through stainless steel enclosures, heavy-wall PVC, fiberglass tanks, and composite panels. With 8% Cobalt content and a precision-balanced body (TIR < 0.2mm) , this 80mm hole saw delivers a machine-finished hole – perfectly round, on size, and ready for gland fittings, conduit, or pipe penetrations.
Built for high-torque magnetic drills and heavy-duty hand drills, it solves the three real problems of large-diameter cutting: wobble, heat softening, and stuck slugs.
| Parameter | Value |
|---|---|
| Diameter | 80mm (3-5/32″) |
| Material | M42 High-Speed Steel with 8% Cobalt |
| Tooth Hardness | 67–69 HRC |
| Tooth Design | 4/6 TPI Variable Pitch |
| Cutting Depth (standard) | 38mm (1-1/2″) |
| Max Material Thickness (steel) | 5mm (recommended) |
| Max Material Thickness (soft metal/PVC) | 10mm |
| Runout (TIR) | < 0.2 mm |
| Core Ejection | Dual-angle speed slots (screwdriver lever compatible) |
| Arbor Compatibility | 1/2″ hex / 7/16″-20 UNF thread (arbor sold separately) |
| Material | Recommended RPM | Lubrication | Feed Pressure |
|---|---|---|---|
| Stainless Steel (304/316) | 90 – 130 | Heavy cutting oil | Slow, steady |
| Mild Steel / Iron | 180 – 250 | Cutting paste or oil | Moderate |
| Aluminum | 300 – 400 | Isopropyl alcohol or light oil | Fast but controlled |
| PVC / ABS Plastic | 350 – 450 | None or water mist | Light |
| Fiberglass (GRP) | 200 – 300 | None (vacuum dust) | Moderate |
| Hardwood / Plywood | 400 – 500 | None | Fast |
This 80mm diameter is a key industrial size for several high-growth sectors:
4.1 Electrical & Switchgear Manufacturing
Cut clean openings for 80mm cable glands, large control panel entries, and heavy-duty conduit fittings in stainless steel or mild steel enclosures. Burr-free finish ensures IP-rated waterproof seals.
4.2 Industrial Plumbing & Sanitary Engineering
Perfect for 3-inch drain pipes (80mm OD), overflow lines, or pump connections in stainless, copper, and thick-wall PVC. No secondary deburring required.
4.3 Commercial HVAC & Ventilation
Create entry points for 80mm duct collars, fresh air intakes, or exhaust ports through metal cladding, insulated panels, or heavy-gauge steel.
4.4 Water Treatment & Tank Fabrication
Drill through polyethylene, polypropylene, or fiberglass tanks for level sensors, inspection ports, or 80mm bulkhead fittings without cracking or delamination.
4.5 Marine & RV Refits
Install deck fills, tank vents, or instrumentation through GRP hulls, aluminum frames, or composite sandwich panels – the 8% Cobalt resists abrasive fiberglass wear.
| Customer Challenges | Our Engineered Solutions |
|---|---|
| "Large hole saws vibrate and cut oversized holes." | Every 80mm saw is dynamically balanced to TIR < 0.2mm. The 4/6 variable pitch breaks harmonic vibration – hole stays exactly 80mm. |
| "The slug gets stuck and wastes my time." | Dual-angle speed slots let you insert a screwdriver as a lever and pop the core out in 2 seconds. |
| "Stainless steel destroys saws instantly." | 8% Cobalt maintains red hardness above 600°C. Teeth don't anneal from friction heat. 3× the life of standard M3 saws. |
| "I can't tell if the saw is dull until it smokes." | The 4/6 variable TPI provides audible feedback – when it sings or chatters, adjust speed or pressure before failure. |
Q1: What is the correct RPM for 80mm in stainless steel?
A: For 304 or 316 stainless steel (up to 5mm thick), run 90–130 RPM with heavy cutting oil. Use a magnetic drill or powerful low-speed hand drill. Never exceed 180 RPM – heat will work-harden the material and destroy teeth.
Q2: Can this 80mm hole saw cut through 10mm thick mild steel plate?
A: Not in a single pass. Maximum recommended steel thickness is 5mm. For 10mm plate, use a pilot drill, then the hole saw, backing out every 2mm to clear chips. Better yet, use an annular cutter for plate over 6mm. This hole saw excels at thin-to-medium wall (3–5mm) and sheet materials.
Q3: Does it fit a standard arbor?
A: Yes. It uses the universal 1/2″ hex drive or 7/16″-20 thread (the two most common arbor types in North America and Europe). Arbor and pilot bit are sold separately unless noted in your bundle.
Q4: Will this work for 80mm LED downlights (recessed lights)?
A: Yes – many commercial LED downlights and gimbal lights require exactly 80mm. The variable TPI and low runout prevent drywall crumbling or ceiling tile tearing. For plasterboard, run at 350–400 RPM with light pressure.
Q5: How do I prevent burrs on the back side of stainless steel?
A: Use firm, steady feed pressure – don't let the saw rub. Apply cutting oil constantly. When you're 2mm from breakthrough, reduce pressure by 50% to push the slug out cleanly. A light deburring pass with a countersink tool takes 5 seconds, but many users report minimal burrs on 2mm 304.
Q6: Is this hole saw compatible with a magnetic drill press?
A: Absolutely. The heavy-duty reinforced steel base and M42 teeth are designed for magnetic drill torque. Use the 1/2″ Weldon shank arbor for best results.
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