Also referred to as a tipped tooth blade, this circular saw blade has carbide tips that are a bit wider than the thickness of the blade, which allows the teeth to cut freely without having the blade bind.
Also called case hardening. The addition of hardness to the surface of steel by heating the steel in contact with carbon. Heated material is exposed to carbon then hardened by quenching or cooling slowly, reheating and quenching again. Used on tolls which need to retain the resilience of a soft metal to avoid cracking but need a hard surface or when it is simpler or cheaper to shape and carburize a softer material rather than using a harder metal. Cutting tools used for metal lathes or milling machines or the center of a lathe tailstock are usually carburized for wear resistance. Tools that must remain sharp while being resistant to impact are often carburized
Flat L-shaped measuring tool, also called a framing square, is used to calculate lengths and lay out angles. The legs of the L, which come together at a right angle, have measuring tables and marks for rafter cuts etched into them. Also called a framing square.
Bolt with a squarish section under a rounded head without a slot; underneath the head is a square shoulder. It bears a resemblance to a wood screw and is good for wood to wood connections. Carriage bolts have either cut or rolled threads. Cut thread bolts have threads cut into the bolt; the rolled thread bolts have the threads pressed into the bolt shaft making the threaded section a little thicker than the bar shank. Cut thread bolts are the preferred type because they are more uniform. Rolled thread bolts work well in smaller sizes but, in larger sizes, the shank may be loose enough in a large hole to pass the threaded end. To use: carriage bolts are pushed into a hole the same size as the shank and then hammered in the rest of the way; the squarish part locks it firmly in place.