Bosch Hole Saw HB550 5-1/2 Inch Bi-Metal 8 Percent Cobalt Alloy Heavy Duty Cutter (Progressor Tooth 1-5/8 Depth Wood Mild Steel Boring Mandrel Tool)

Industrial Grade Cutting Performance: Bosch 5-1/2" Bi-Metal Hole Saw with 8% Cobalt

Heavy-Duty 5-1/2-Inch Bi-Metal Hole Saw with 8 Percent Cobalt Alloy Teeth, Progressor Vari-Pitch Geometry, and Reinforced Shell Shoulder

The Bosch HB550 5-1/2 Inch Bi-Metal Hole Saw 8 Percent Cobalt Alloy Heavy Duty Cutter for Wood and Metal Applications delivers specialized deep-cavity substrate excavation utility and exceptional rapid coring efficiency across demanding commercial HVAC ventilation setups, large-scale drainage stack lines, and structural industrial electrical conduit entries. Engineered with premium M42 high-speed steel containing an 8% cobalt alloy bound natively to a flexible high carbon steel backing frame, this high-performance layout tool cleanly penetrates structural lumbers and thick sheet metals while entirely avoiding shell distortion under severe torsion loads. This professional contractor solution resolves frequent tooth stripping failures when hitting abrasive metal plates, binding stalls caused by poor chip clearing, and slow adapter swap downtime by combining an aggressive variable Progressor tooth geometry with integrated chip clearance windows, a reinforced shoulder framework, and universal quick-change mandrel adapter flexibility. Outfitted with an essential 5-1/2 inch cutting diameter sweep path, an matching 1-5/8 inch operational deep depth clearance, a high-torque structural barrel thickness, and optimized tooth configurations, this robust boring cutter optimizes subcontractor project staging metrics during large plumbing rough-ins, heavy utility structural box fittings, and structural timber adjustments.

Best Used For:

• HVAC Ventilation Staging: Boring massive, uniform 5-1/2 inch air return paths natively through multi-layer commercial wood frame partitions and sheet metal housings without wander.
• Commercial Plumbing Drainage: Penetrating deep 2x4 framing studs, floor joists, and protective structural metal shield plates single-handedly to route large industrial waste stacks.
• Industrial Conduit Routing: Slicing crisp electrical entry paths cleanly through heavy mild steel equipment housings and thick polymer junction panels on active jobsite floors.

Key Performance & Safety Features

• 8% Cobalt Alloy Configuration: Industrial M42 steel tooth tips isolate extreme friction heat loops completely, extending active edge retention during continuous drilling through thick metals.
• Progressor Vari-Pitch Geometry: Specialized variable tooth angle pattern accelerates dynamic chip extraction velocities while dampening structural tool chatter spikes.
• Reinforced Backing Shoulder: Heavy-gauge reinforced structural collar absorbs severe equipment rotational torque, preventing roundness deformation during deep cuts.
• High Carbon Steel Frame Backing: Resilient tool body chassis flexes safely under high-torque shocks, reducing accidental operational shell fractures or separation errors.
• Universal Mandrel Quick-Change Link: Mounting seat adapts seamlessly to standard large arbors or universal Quick Change adapters to shorten sizing turnaround periods.

What's Included

• (1) Bosch 5-1/2 Inch Bi-Metal Cobalt Progressor Hole Saw Cup (HB550)
• Note: Connection mandrel base, pilot drill centering pins, and quick-change nut accessories are sold separately.

Technical Specifications

Pro-Tip: When cutting massive 5-1/2 inch utility profiles through commercial metal structures, anchor the drill firmly at a lower RPM velocity. Letting the Progressor bi-metal teeth shave the channel path smoothly with adequate layout thread fluid reduces aggregate friction forces and stops tooth tip glazing completely.