Dewalt DW4821B Bi-metal Reciprocating Saw Blade 8in 18TPI

Product Description

The DEWALT DW4821B is a bi-metal reciprocating saw blade designed for demanding cutting applications in the trades. Measuring 8 inches in length with an 18 TPI (teeth per inch) straight-back profile, this blade is built for controlled, fine-pitch cutting through metal pipe, conduit, and similar materials. The bi-metal construction pairs a high-speed steel cutting edge with a flexible alloy steel body, which resists blade breakage during aggressive or angled cuts. Plumbers, electricians, pipefitters, and general contractors rely on this blade format for tight-clearance demo and rough-in work where precision tooth count matters.

The DW4821B suits residential and light commercial service work where an 18 TPI blade is called for — thin-wall metal, electrical conduit, copper tubing, and similar workpieces. The straight-back body seats securely in standard reciprocating saw chucks. Sold individually, this blade fits into a technician toolkit wherever a fine-tooth recip blade is routinely consumed during service calls or renovation work.

Key Features

• 8-inch blade length for reach in deep or confined cutting locations
• 18 TPI tooth pitch for smooth, controlled cuts in thin-wall metal and tubing
• Bi-metal construction combines HSS teeth with a flexible alloy steel back to resist breakage
• Straight-back profile for broad compatibility with standard reciprocating saw chucks
• Lightweight at 0.06 pounds — minimal added weight in a tool bag

Compatibility

Designed as an OEM-style replacement blade compatible with standard reciprocating saws that accept universal shank bi-metal blades.

Installation Notes

Blade installation and removal should be performed with the reciprocating saw powered off and unplugged or with the battery pack removed. Verify the blade is fully seated and the chuck mechanism is locked before operating the tool. Always wear appropriate eye and hand protection when changing or using reciprocating saw blades. Consult applicable worksite safety codes and tool manufacturer guidelines for proper blade selection based on material type and thickness.

Technical Specifications

• Blade Length: 8 inches
• Teeth Per Inch (TPI): 18
• Blade Style: Straight Back
• Blade Material: Bi-Metal
• Weight: 0.06 pounds
• Unit of Measure: Each
• UPC: 028877338248

Standard Information

• Brand: DEWALT
• Manufacturer Part Number: DW4821B