CMT 551-020X Bi-Metal Plus Hole Saw - 25/32" (20mm) is engineered for professionals who need reliable, fast, and repeatable hole cutting in metal, stainless steel, cast iron, aluminum, copper, brass, and plastics. Built with 8% Cobalt bi-metal construction and designed around the XTREME FAST Push and Lock system, this 20mm hole saw delivers extended cutting life and tool-free arbor changes - making it a smart choice for electricians, plumbers, fabricators, and HVAC technicians working in demanding conditions.

Key Features

• Bi-Metal 8% Cobalt (BIM) Construction - the 8% Cobalt content in the cutting teeth provides 2x longer cutting life compared to standard bi-metal hole saws, reducing downtime and replacement costs on tough materials like stainless steel and hardened steel.
• XTREME FAST Push and Lock System - hole saw changes take under 3 seconds with a simple push and no tools required, keeping your workflow moving without stopping to search for wrenches or adapters.
• Variable Pitch Teeth (4-6 TPI) with Alternate and Side-Set - the alternating tooth geometry reduces vibration and heat buildup, producing cleaner cuts and extending blade life across a wide range of materials from thin sheet metal to thick cast iron.
• 25/32" (20mm) Cutting Diameter - a precise, consistent bore diameter suited for conduit knock-outs, pipe penetrations, and hardware installations where accuracy directly affects fit and finish.
• 45mm Cutting Depth - the generous cutting depth handles thick-walled materials and deeper stock without needing to reposition or flip the workpiece, saving time on heavier fabrication tasks.
• Right-Hand (RH) Rotation - compatible with standard cordless drills, corded drills, and drill presses without any adaptation, making the saw immediately ready to use with common shop equipment.
• Hexagonal Shank - the hex shank locks securely in the arbor with no slipping under load, delivering consistent torque transfer even in high-resistance materials like cast iron and stainless steel.
• Compatible with 550-PH85 and 550-PH11 Push and Lock Arbors - works with both 11/32" and 7/16" hex arbors, giving you flexibility across different drill platforms without purchasing additional adapters.

Why This Product

• Faster job site changeovers - the Push and Lock arbor system eliminates fumbling with wrenches during arbor swaps, a real advantage when cutting multiple hole sizes throughout a project in steel, aluminum, or plastic.
• Built to last in the hardest materials - the 8% Cobalt bi-metal teeth resist heat and wear when cutting stainless steel and cast iron, two materials that rapidly dull standard hole saws, meaning fewer saw replacements over the life of a job.
• Versatile across metals and non-metals - the variable 4-6 TPI tooth pitch handles everything from thin-gauge sheet metal and copper tubing to cast iron and rigid plastics, reducing the need to swap saws between material types.
• Made in Italy precision manufacturing - the 551X Series is produced under strict manufacturing standards, ensuring consistent diameter accuracy and tooth geometry that professional tradespeople can depend on for repeatable, clean results.

Specifications

• Manufacturer Part Number: 551-020X
• Brand: CMT Orange Tools
• Diameter: 13/16"
• 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