The CMT 551-092X Bi-Metal Plus Hole Saw delivers a 3-5/8 in. (92mm) cutting diameter engineered for demanding metal-cutting applications where standard hole saws fall short. Built with an 8% Cobalt bi-metal (BIM) construction, this hole saw is designed to cut through stainless steel, hardened steel, cast iron, aluminum, copper, brass, and plastics with extended tool life compared to conventional bi-metal designs. Whether you are a contractor drilling through structural steel, a plumber cutting pipe penetrations, or an electrician working through metal enclosures, this CMT hole saw offers the durability and cutting speed that professional-grade work demands.

Key Features

• Bi-Metal 8% Cobalt (BIM) Construction - the elevated cobalt content in the tooth alloy significantly extends cutting life when working through tough materials like stainless steel and hardened steel, reducing tool change frequency on the job.
• 3-5/8 in. (92mm) Cutting Diameter - a large-format hole size suited for conduit knockouts, pipe penetrations, and access holes in metal panels where a precise, clean bore is required.
• 45mm Cutting Depth - sufficient depth capacity to cut through typical sheet metal assemblies, structural members, and layered materials without needing to reposition the tool.
• Right-Hand (RH) Rotation - compatible with standard drill chucks and arbors on cordless drills, corded drills, and drill presses, ensuring straightforward integration with common workshop and job-site equipment.
• Hexagonal Shank - the hex shank design locks securely into compatible arbors, minimizing slippage under load and maintaining accurate hole positioning during cuts in metal and plastic materials.
• XTREME FAST Push and Lock System - the series 551X Push and Lock arbor interface allows fast hole saw changes in seconds without tools, reducing downtime when switching between sizes on multi-hole projects.
• Variable 4-6 TPI Tooth Pitch - the alternate and side-set variable tooth pattern reduces vibration and chatter during cutting, producing smoother entry and exit on steel, cast iron, aluminum, and non-ferrous metals.
• Compatible with Multiple Materials - cuts stainless steel, mild steel, cast iron, aluminum, copper, brass, and plastics from a single tool, making it a versatile addition to any metal fabrication or mechanical installation workflow.

Why This Product

• The 8% Cobalt bi-metal construction makes this hole saw a practical choice for tradespeople who regularly cut stainless steel or hardened steel, where standard bi-metal tools wear out quickly and increase cost per hole.
• At 3-5/8 in. (92mm) diameter and 45mm cutting depth, this saw handles a broad range of penetration and knockout tasks in a single pass, eliminating the need for secondary drilling or step-up operations.
• The XTREME FAST Push and Lock arbor system pairs with the 550-PH85 and 550-PH11 arbors, giving users a tool-free changeover that meaningfully speeds up multi-bore jobs on the drill press or handheld drill.
• The variable 4-6 TPI pitch and alternate side-set tooth geometry reduce vibration and extend tooth life across a wide range of compatible materials - from cast iron and copper to engineering plastics - without requiring a dedicated saw per material type.

Specifications

• Manufacturer Part Number: 551-092X
• Brand: CMT Orange Tools
• Diameter: 3-5/8 in. (92mm)
• 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 in. hex) and 550-PH11 (7/16 in. 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