There are many designs of chain saws, from those that handle trimming small trees to heavy demolition models. In the past, we had to adapt the off-shelf chain saws to work for us, but now there are several good fire service chain saws and chains with features specifically designed for our applications. There are new chain designs coming out all the time.
Chain saws are a vital tool for emergency responders and firefighters and are used for a variety of demolition/rescue tasks, including the following:
- Roof ventilation.
- Forcible entry.
- Clearing fire lines.
- Removing hazard trees or snags.
- Constructing shoring systems to support unstable buildings.
When selecting your chain saw, look for the following:
- Wrap-around handle.
- Large recoil starter handle for gloved hands.
- Automatic chain break and chain catcher.
- Spark arrestor.
- 16- to 20-inch bar.
- 6- to 8-horsepower (hp) range.
- Chain for demolition/forcible entry.
- Chain for tree work.
TYPES OF CHAIN SAW CHAINS
There are many different chain saw chains. Each type is made up from a configuration of the following five elements:
- Chain pitch.
- Chain gauge.
- Cutter material.
- Cutter style.
- Chain arrangement,
You can choose some aspects of your chain saw chain based on your skill level and application. Other aspects are set by the saw. There are no universal chain saw chains, and there are more types than discussed here. We will limit ourselves to the type most common to the fire service. Buy a quality chain from a reputable manufacturer. First, let’s get to know what makes up chain saw chains.
The “pitch” and “gauge” and, to some degree, the length of the bar are determined by your chain saw.
For most of our needs, a chain with a 3⁄8-inch pitch works well. Pitch is defined by the distance between any three consecutive rivets, divided by two. The 3⁄8-inch chain offers good flexibility, adequate strength, low weight, and substantial cutting speed.
Chain saw chain gauge refers to the thickness of the drive links, which are the parts of the chain that fit into the guide bar groove. It’s a crucial measurement for ensuring proper fit and function, as the chain gauge must match the guide bar gauge.
The 3⁄8-inch chain can handle up to a 100-cc chain saw engine (approximately 8.5 hp). The bigger the chain saw bar, the more force you need to apply when driving it into the wood; you may also need a bigger engine. For this reason, manufacturers provide a recommended bar length for their chain saws.
CUTTER MATERIAL
Chain saw chains are typically made of steel alloys. The cutting teeth (cutters) are often chrome-tipped for durability and resistance to wear, while some chains use tungsten carbide or diamond tips for even greater hardness and longevity, particularly in demanding or dirty environments. For our application, I recommend steel alloy or carbide chain.
CARBIDE CHAIN
There are multiple types of cutting tips for chain saw chains. On any given day, a fire service chain saw could encounter any of the following materials: asphalt and wood shingles, light tin flashing, plywood sheeting, dimensional lumber, drywall, tree limbs, and everything in between. For all these different materials, the carbide-tipped chains work well. Carbide chains will outlast a chisel chain up to 4:1. They’re also used to cut wood with nails in it, stubborn roots and branches, and even asphalt. Made for demolition, however, it cuts a down tree (green) slower than a chipper chain. They can be resharpened by ha