Milwaukee 5-Pack 3-1/2″ Metal HACKZALL Blades

The Milwaukee 49-00-5324 pack delivers exactly what contractors need for cutting in tight spaces — a 3.5-inch blade length that eliminates blade bounce where standard 6-inch blades would hit obstructions. At 24 TPI with Thin Kerf design, these bi-metal blades deliver 35% more cuts per battery charge versus competing blades. Worth it for electrical and plumbing contractors who spend half their day working in confined spaces.

Skip these if you’re cutting 2x4s or structural lumber. The 3.5-inch length is too short for standard dimensional lumber. They’re built for metal, plastic, and the occasional nail-embedded wood — not framing work.

Tight-Space Performance That Actually Matters

Standard reciprocating saw blades run 6 inches or longer, making them nearly useless in electrical boxes or between tight joists where the blade toe hits obstructions. The 3.5-inch profile with scroll tooth geometry changes the game for maneuverability.

These blades handle sheet metal cutting, metal scrolling, and cutting in confined locations — exactly where full-length blades fail. The short stroke means you’re not bouncing off the back wall of an electrical box or smacking floor joists while cutting pipe hangers. The scroll tooth geometry handles plastics and fiberglass too, making these true multi-material blades for tight quarters.

Specification	Value
TPI	24 (Teeth Per Inch)
Blade Length	3-1/2 inches (88.9 mm)
Material	Bi-Metal (High Speed Steel teeth with flexible backing)
Shank Type	Universal 1/2-inch shank
Kerf	Thin Kerf
Blade Width	Scrolling (narrow blade profile)
Pack Quantity	5 blades

Battery Runtime and Multi-Tool Compatibility

Milwaukee claims 35% more cuts per charge versus leading competitors, thanks to the Thin Kerf optimization for cordless tools. Less material removal means less battery drain — simple physics that matters when you’re three hours into a job. The design specifically targets M12 and M18 Hackzall tools, though the universal 1/2-inch shank fits all reciprocating saws.

Compatible brands include Milwaukee, DeWalt, Makita, Bosch, and Ryobi — any reciprocating saw with a standard blade clamp. Notable Milwaukee models include the M12 Hackzall (2420, 2520) and M18 Hackzall (2625, 2719). The universal shank means you’re not locked into one tool ecosystem.

With a 4.4-star average rating across approximately 50 reviews, users consistently praise the maneuverability and durability. Pros highlight excellent maneuverability, perfect performance on thin metal, durable teeth, and the compact size advantage. The main complaints center on limitations with thick metal and the inability to handle standard 2x4 lumber — exactly what you’d expect from a specialty blade.

FAQ

What materials can these blades cut? Primary applications include metal scrolling, sheet metal cutting, and cutting in tight or confined locations. Secondary uses cover plastics, wood with embedded nails, and fiberglass. The 24 TPI rating and bi-metal construction handle these mixed materials without tooth damage.

Are these blades only for Milwaukee tools? No. The universal 1/2-inch shank fits all reciprocating saws including Milwaukee, DeWalt, Makita, Bosch, and Ryobi brands. While optimized for Milwaukee’s M12 and M18 Hackzall models, they work in any standard reciprocating saw or Sawzall.

What’s the actual blade thickness? The blades measure approximately 0.035 to 0.040 inches thick, which is standard for reciprocating saw blades. This provides the right balance between flexibility and rigidity for curved cuts.

How should these blades be installed? Insert the 1/2-inch universal shank into the saw’s blade clamp. For Milwaukee tools, rotate the QUIK-LOK collar or press the blade release lever, insert until seated, and release. Always unplug the tool or remove the battery before changing blades.

What’s covered under warranty? Milwaukee provides a limited warranty covering manufacturer’s defects in material and workmanship, but normal wear and tear like dulling teeth is not covered. Claims are typically handled through Milwaukee support or authorized service centers.