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| Brand Name: | XRTOOLS |
| Model Number: | 108 |
| MOQ: | 500PCS |
| Price: | $0.35-22/PCS |
| Delivery Time: | 30-35 days |
| Payment Terms: | L/C, T/T, D/P, Western Union, MoneyGram |
The Problem: Most 108mm hole saws suffer from three critical issues: tooth burn-out due to high peripheral speed, extreme vibration (chatter), and the "slug" (core) becoming permanently jammed inside the cup.
The Cause: Large diameters generate immense friction heat at the tips. Standard M3 steel softens at these temperatures, leading to dull teeth and ragged hole edges.
The M42 Solution: Our 108mm M42 Cobalt Series addresses these points with 8% Cobalt-reinforced teeth. This material upgrade provides the "Red Hardness" necessary to maintain a razor-sharp edge even when the tool reaches high temperatures during continuous boring in stainless steel or heavy timber.
| Feature | Technical Specification | Professional Benefit |
| Material Chemistry | Certified HSS M42 (8% Cobalt) | High Thermal Stability: Cuts 304 Stainless Steel without annealing. |
| Boring Precision | TIR (Runout) ≤ 0.25mm | Zero-Wobble Performance: Ensures a perfect 108mm fit for 4" fixtures. |
| Tooth Geometry | 4/6 TPI Variable Pitch Design | Vibration Cancellation: Prevents "scalloped" edges in drywall and metal. |
| Welding Standard | Vacuum Electron-Beam Fusion | Shatter-Proof: Teeth remain attached during high-impact nail strikes. |
| Throat Depth | 38mm (1-1/2") Heavy-Duty Cup | Deep Penetration: Cuts through subfloors and thick panels in one pass. |
This 108mm diameter is the "Standard for High-Volume Systems." We have optimized it for the following professional scenarios:
Commercial HVAC & Exhaust Systems:
The primary tool for creating entry points for 4-inch (100mm) ventilation ducts and dryer vents. The M42 teeth easily penetrate metal cladding and composite insulation without snagging.
Plumbing & Drainage Infrastructure:
Perfectly calibrated for 4" Schedule 40 PVC and Copper pipes. The 108mm diameter provides the exact clearance needed for standard pipe sleeves and acoustic insulation.
Professional Lighting Installation:
Designed for large-diameter recessed "Pot Lights" and industrial LED fixtures. The precision-ground teeth prevent "blow-out" in ceiling drywall, ensuring the trim plate covers the hole perfectly.
Marine & Heavy Construction:
Boring through Fiberglass (GRP) hulls or thick aluminum alloy frames. The 8% Cobalt content resists the abrasive nature of glass fibers that typically dull standard saws in seconds.
Harmonic Suppression Technology: Large saws often "dance" on the surface. Our Non-Linear 4/6 TPI Variable Pitch design breaks the harmonic resonance. This results in a stable, quiet cut that requires 30% less physical pressure from the operator.
Industrial Friction-Shield Coating: The surface is treated with a specialized low-friction coating. This prevents "galling" (material welding to the tool) when drilling through aluminum or resinous woods like Pine, keeping the cutting action fast and cool.
Rapid Core Ejection System: Featuring oversized Dual-Angle Speed Slots, our design allows for instant slug removal. A simple screwdriver flick through the side window ejects the plug, saving minutes on every hole.
Q: Why choose M42 (8% Cobalt) over standard Bi-Metal for 108mm holes?
A: At 108mm, the outer teeth move at high speeds. M42 steel maintains its hardness up to 1200°F (650°C), whereas standard M3 saws fail at 600°F. M42 is essential for cutting metal studs or stainless steel without destroying the tool.
Q: What is the recommended RPM for 108mm in Mild Steel?
A: To maximize tool life, run at 35 - 45 RPM. Running at higher speeds without lubricant will burn out any hole saw regardless of the material.
Q: Can I use this for dry-cutting in wood?
A: Yes. The variable pitch teeth are excellent for wood, effectively clearing chips to prevent heat buildup. However, for metal, always use cutting oil.
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