Bosch t121af3 Bi-metal Jigsaw Blade 21 Tpi T Shank 3 Pack

Product Description

The BOSCH t121af3 is a bi-metal jigsaw blade designed for cutting thin metal, including sheet metal and light-gauge stock. At 3 5/8 inches in blade length and ground to 21 teeth per inch (TPI), it delivers fine, controlled cuts where wood-cutting blades would skip or tear. The higher TPI count engages more cutting edges per stroke, reducing burring and improving cut quality on ferrous and non-ferrous sheet materials. This blade accepts a T shank, the industry-standard quick-change mount found on most modern jigsaws. Sold in a 3-pack, making it a practical carry stock for service vans and job boxes.

This blade is suited for trade applications where thin metal must be cut on-site without dedicated metal-cutting power tools. Electricians trimming electrical enclosures, HVAC techs cutting sheet metal panels, and plumbers working with light-gauge flashing or strapping will find the 21 TPI geometry appropriate for the task. The bi-metal construction resists heat and flex fatigue better than high-carbon steel blades, extending usable life in repetitive cutting scenarios.

Key Features

• 21 TPI bi-metal construction for clean cuts in thin metal and sheet stock
• 3 5/8 inch blade length suits standard-depth sheet metal and light-gauge material
• T shank mount for tool-free blade changes on compatible jigsaws
• Bi-metal composition resists heat buildup and flex fatigue during extended use
• 3-pack quantity reduces mid-job downtime on multi-cut applications

Compatibility

Designed for use with T-shank-compatible jigsaws. The T shank is the standard fitment across a wide range of professional and prosumer jigsaw models. Verify your jigsaw accepts T shank blades before installation.

Installation Notes

Blade changes should be performed with the jigsaw unplugged or the battery removed. Insert the T shank fully into the blade clamp until it seats and locks. When cutting metal, use a slower orbital setting and apply light, consistent forward pressure to avoid blade deflection. Eye protection and gloves are recommended when handling and installing metal-cutting blades.