CMT 551-083X Bi-Metal Plus Hole Saw is a professional-grade 3-1/4" (83mm) hole cutting tool built with 8% Cobalt bi-metal construction for extended cutting life in demanding materials. Designed for right-hand rotation with a hexagonal shank interface, this hole saw is engineered to cut through stainless steel, steel, cast iron, aluminum, copper, brass, and plastics - making it a versatile choice for mechanical, electrical, and plumbing trades requiring clean, accurate holes in metal and non-ferrous workpieces.

Key Features

• 8% Cobalt Bi-Metal (BIM) Construction - the elevated cobalt content in the tooth material delivers 2x longer cutting life compared to standard hole saws, reducing tool changeovers and cost per hole on tough metals including stainless steel and cast iron.
• Variable 4-6 TPI Alternate and Side-Set Teeth - the variable pitch tooth geometry reduces vibration and harmonic chatter during cutting, producing smoother holes and extending tooth life across a wide range of material thicknesses.
• 3-1/4" (83mm) Diameter - sized for common trade applications such as pipe penetrations, conduit, and knockout holes, this diameter eliminates the need for multiple passes or secondary enlarging steps.
• 45mm Cutting Depth - provides sufficient depth capacity for cutting through standard structural materials, thick-wall pipe, and stacked substrates in a single pass.
• XTREME FAST Push and Lock System - tool-free arbor changes in under 3 seconds keep crews productive on the job site without searching for wrenches or hardware.
• Compatible with 550-PH85 (11/32" hex) and 550-PH11 (7/16" hex) Push and Lock Arbors - broad arbor compatibility means this saw fits multiple cordless and corded drill platforms already in use.
• Right-Hand Rotation - matches the standard chuck direction of cordless drills, corded drills, and drill presses, ensuring immediate drop-in compatibility without adapters.
• Made in Italy - precision manufacturing standards contribute to consistent tooth geometry, dimensional accuracy, and reliable hole tolerances across the saw's service life.

Why This Product

• Tradespeople cutting stainless steel and hardened steel need a hole saw that stays sharp - the 8% Cobalt BIM teeth are specifically formulated to resist heat and wear in high-strength ferrous metals where standard bi-metal saws degrade quickly.
• The 3-1/4" (83mm) diameter with a 45mm cutting depth covers a wide range of pipe, conduit, and knockout applications in a single tool, reducing the number of hole saws needed on the job.
• The Push and Lock arbor system eliminates the fumbling and wrenching associated with traditional threaded connections - especially valuable when swapping between multiple hole saw sizes during a busy installation day.
• With compatibility across cordless drills, corded drills, and drill presses, this hole saw integrates into existing tool setups without requiring dedicated equipment or additional adapters beyond the supported arbors.

Specifications

• Manufacturer Part Number: 551-083X
• Brand: CMT Orange Tools
• Diameter: 3-1/4" (83mm)
• 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
• Use with corded drills
• Use with drill presses