The Diablo D0842CF 8 in. x 42-Tooth Steel Demon Cermet II Saw Blade for Thick Metal is a metal cutting circular saw blade built for steel, stainless steel, and other thick metal stock. This is a circular saw blade designed for thick metal cutting. Model Number: D0842CF. If you are running a dedicated 8 inch low RPM metal cutting saw and need cleaner cuts than a grinding disc can deliver, this blade is made for that job.

What matters here is not just the 42-tooth count, but the tooth style and the way the blade handles heat. Diablo uses Cermet II teeth with a triple chip grind to cut metal faster while staying cooler than a grinding disc. That means less discoloration on the workpiece, fewer sparks, and cleaner edges that usually need less rework. On the job, that saves time when you're cutting angle iron, flat bar, channel, steel studs, EMT conduit, plate, bar stock, or threaded rod.

The blade is sized at 8 inches with a 5/8 inch arbor, a 0.075 inch kerf, a 0 degree hook angle, and a 0.063 inch plate. Those numbers matter because they help explain how the blade stays controlled in metal. The thin kerf reduces cutting resistance and heat buildup, while the neutral hook angle helps keep the cut predictable in harder materials. Diablo also calls out an optimized blade design to reduce wandering and deflection, which is exactly what you want when you're trying to keep a cut line straight in steel instead of fighting the blade.

Diablo also built this blade around jobsite durability. The tri-metal shock-resistant brazing is there to help the teeth stand up to impact, and the Perma-SHIELD coating helps resist heat buildup, gumming, and corrosion. Laser-cut stabilizer vents are included to reduce noise and vibration, which helps the blade track straighter and keeps it from feeling as harsh in the saw. That combination is a big reason why metal cutting blades like this can feel more controlled than an abrasive wheel when you are doing repeated cuts.

For real-world cutting range, Diablo lists this blade for 1/16 inch to 1/4 inch wall thickness in steel studs, angle iron, flat bar, channel, and EMT conduit. It also covers 1/8 inch to 1/2 inch wall thickness in plate and bar stock, plus threaded rod from 1/4 inch up to 1-1/2 inch diameter. That gives it a broad enough range for fabrication work, commercial build-outs, mechanical installs, and general steel cutting where one blade needs to handle several material types without constantly changing over.

This blade is made to run in a dedicated low RPM metal cutting saw and carries a maximum speed rating of 4,300 RPM. It is also described by Diablo as suitable for cordless or corded circular saw applications, but the operating limit still matters. Matching blade size, arbor, and saw speed is what keeps cuts clean and the blade working the way it should. If your setup is right, you get the main benefits this blade is built for: faster metal cutting, cooler operation, less dust than a grinding disc, and better finished edges.

Who should buy it? This blade makes sense for metalworkers, electricians, HVAC installers, general contractors, and anyone regularly cutting ferrous materials on site. It is especially useful if you are tired of the mess, heat, and slow pace of grinding discs and want a blade that cuts steel studs, stainless, and structural shapes with more control. If your work is mostly thick metal rather than sheet metal, this is the right version of the Steel Demon line to look at.

Diablo D0842CF is the right blade when grinding discs are slowing you down

If you cut thick steel often and want faster, cooler, cleaner results, this blade makes a lot more sense than burning through abrasive wheels.

• Who it's for: Pros cutting steel studs, angle iron, flat bar, channel, stainless steel, plate, and threaded rod with a dedicated metal cutting saw.
• Why it stands out: The Cermet II tooth design, thin kerf, and stabilizer vents work together to give you cleaner cuts with less heat, less vibration, and longer service life.
• Worth knowing: This is not a general-purpose wood blade and it is not a free-for-all fit. Match the 8 in. diameter, 5/8 in. arbor, and 4,300 RPM limit to the right saw.

• What materials is this blade designed to cut? It is designed for thick metal and stainless steel, including steel studs, angle iron, flat bar, channel, EMT conduit, plate, bar stock, and threaded rod.
• What saw does this blade fit? It is intended for a dedicated 8 in. low RPM metal cutting saw that accepts a 5/8 in. arbor blade.
• What is the maximum speed rating? The maximum blade speed is 4,300 RPM.
• What wall thickness range can it handle? Diablo lists 1/16 in. to 1/4 in. wall thickness for studs, angle iron, flat bar, channel, and EMT conduit, plus 1/8 in. to 1/2 in. for plate and bar stock.