M12™ Hackzall™ Blade-Duct

Milwaukee 49-00-5424 — HACKZALL™ Duct / Sheet Metal Reciprocating Blade (5-Pack)

The Milwaukee 49-00-5424 is a specialty 4" reciprocating saw blade set (5-pack) designed for cutting HVAC ductwork and thin sheet metal, especially in tight spaces using M12 HACKZALL™ or standard Sawzall® tools.

What it is

• Type: Reciprocating saw blade (Sawzall / Hackzall)
• Length: 4"
• TPI: 24 TPI (fine-tooth for clean metal cutting)
• Material: Bi-metal
• Pack size: 5 blades

This blade is optimized for ductwork and thin-gauge metal cutting, not demolition or wood cutting.

Key Features

• Thin kerf design → reduces resistance and improves efficiency (up to ~35% more cuts per charge)
• Short 4" blade → ideal for tight spaces in walls, ducts, and panels
• Bi-metal construction → flexible backing with hardened teeth for durability
• 24 TPI fine teeth → smooth cutting in thin metal and ducting
• Designed specifically for duct and sheet metal under 1/8" thick

What it’s best for

• HVAC ductwork
• Thin sheet metal (<1/8")
• Electrical and plumbing metal chases
• Tight-space cuts where longer blades won’t fit
• Maintenance and install work