The CMT 551-152X Bi-Metal Plus Hole Saw delivers a full 6" (152mm) cutting diameter for demanding metal fabrication, plumbing, electrical, and HVAC applications. Built with an 8% Cobalt bi-metal (BIM) construction, this right-hand rotation hole saw is engineered to cut through stainless steel, mild steel, cast iron, aluminum, copper, brass, and plastics with significantly longer service life than standard bi-metal hole saws. The 45mm cutting depth and variable 4-6 TPI tooth geometry with alternate and side-set teeth make it a reliable choice for trade professionals and fabricators who need consistent, clean results in hard and abrasive materials.

Key Features

• 8% Cobalt Bi-Metal (BIM) Construction - the elevated cobalt content in the high-speed steel teeth provides 2x longer cutting life than standard hole saws, reducing tool change frequency and downtime on the job.
• 6" (152mm) Cutting Diameter - a large-format bore size suited for conduit knockouts, pipe penetrations, and large circular cutouts in sheet metal, plate steel, and structural materials.
• 45mm Cutting Depth - accommodates thicker workpieces and stacked material cuts, giving the blade enough reach for real-world industrial and construction applications.
• Variable 4-6 TPI Tooth Pitch with Alternate and Side-Set Teeth - the variable pitch reduces vibration and chatter while the alternate and side-set tooth geometry clears chips efficiently, resulting in smoother cuts and less heat buildup in the cut zone.
• XTREME FAST Push and Lock System - tool-free arbor changes in under 3 seconds using compatible Push and Lock arbors, keeping crews productive when swapping between hole saw sizes.
• Right-Hand Rotation - compatible with standard right-hand corded drills, cordless drills, and drill presses - no special setup or reverse-rotation machines required.
• Hexagonal Shank Interface - the hexagonal shank design prevents slipping in the arbor during high-torque cuts, delivering more consistent power transfer to the cutting teeth.
• Compatible with 550-PH85 and 550-PH11 Push and Lock Arbors - integrates directly into CMT's 11/32" hex and 7/16" hex Push and Lock arbor system, so users already invested in the platform can add this size without buying new hardware.

Why This Product

• Professionals cutting stainless steel or hardened steel benefit directly from the 8% Cobalt bi-metal blade material - this grade is specifically chosen for its heat resistance and tooth durability in ferrous and tough non-ferrous metals, reducing premature tooth wear.
• The XTREME FAST Push and Lock system eliminates the time-consuming hex key and set-screw process common with traditional arbors, which translates to real productivity gains when a job requires multiple hole sizes in a single session.
• At 45mm of cutting depth, this hole saw handles a broader range of material thicknesses than shallow-depth alternatives, making it suitable for pipe flanges, structural steel sections, and thick plastic enclosures in a single pass.
• The 6" diameter is a standard size for large conduit entries, sub-panel knockouts, and HVAC penetrations - having a high-cobalt bi-metal version of this size means the saw can handle both light-gauge and heavy-gauge applications without switching to a specialized cutter.

Specifications

• Manufacturer Part Number: 551-152X
• Brand: CMT Orange Tools
• Diameter: 6" (152mm)
• Cutting Depth: 45mm
• Blade Material: Bi-Metal (BIM) 8% Cobalt
• Tooth Pitch: Variable 4-6 TPI (alternate and side-set)
• Rotation: Right-Hand (RH)
• Shank: Hexagonal
• System: XTREME FAST Push and Lock
• Arbor Compatibility: 550-PH85 (11/32" hex) and 550-PH11 (7/16" hex) Push and Lock arbors
• Country of Origin: Made in Italy

Approved Applications

• Hole cutting in steel and stainless steel
• Hole cutting in cast iron
• Hole cutting in aluminum and non-ferrous metals
• Hole cutting in copper and brass
• Hole cutting in plastics
• Use with cordless drills, corded drills, and drill presses