Dewalt DW4839B 12in 10/14 Tpi Bi-metal Reciprocating Blade

Product Description

The DEWALT DW4839B is a 12-inch bi-metal reciprocating saw blade designed for demanding demo and rough-cut work in construction, remodeling, and mechanical service applications. The variable 10/14 TPI tooth pattern allows the blade to transition between faster aggressive cuts and cleaner finish passes, making it effective across a range of materials including wood with embedded nails, conduit, pipe, and other mixed-material assemblies. Bi-metal construction bonds a high-speed steel cutting edge to a flexible alloy steel body, improving both tooth durability and blade fatigue resistance under repeated flex during long cuts.

This blade is suited for residential and light commercial jobsite work where a single blade needs to handle multiple material types. Electricians, plumbers, HVAC technicians, and general contractors commonly stock this length for cutting access openings, removing old pipe, and trimming structural members during retrofit and service work. The 12-inch length provides reach for deep cuts in wall cavities and floor assemblies where shorter blades cannot maintain full contact with the work.

Key Features

• 12-inch blade length for deep-reach cuts in walls, floors, and framing cavities
• Variable 10/14 TPI bi-metal tooth pattern handles wood, nail-embedded lumber, and light metal
• High-speed steel teeth bonded to flexible alloy steel body for extended tooth life and bend resistance
• Sold individually — compatible with standard universal shank reciprocating saws
• Lightweight at 0.07 pounds for easy single-hand blade changes

Compatibility

Designed as an OEM-style replacement and consumable blade for reciprocating saws accepting a standard universal shank. No specific model compatibility data was provided in the product input.

Installation Notes

Blade changes should be performed with the saw unplugged or the battery pack removed before handling the blade. Most reciprocating saws use a tool-free blade clamp mechanism; consult the saw manufacturer's manual for proper insertion depth and locking confirmation. Wear cut-resistant gloves when handling reciprocating blades, as the tooth edge remains sharp along the full 12-inch length. Licensed electricians, plumbers, and HVAC technicians should follow applicable NEC and trade-specific codes when cutting near energized conductors, pressurized lines, or gas pipe.

Technical Specifications

• Blade Length: 12 inches
• TPI: 10/14 variable
• Blade Material: Bi-Metal (high-speed steel teeth, flexible alloy steel body)
• Weight: 0.07 pounds
• Sold As: Each
• Minimum Order Quantity: 100
• UPC: 028877338446

Standard Information

• Brand: DEWALT
• Manufacturer Part Number: DW4839B