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What Is A Bimetal Hole SawBimetal is a composite material composed of two or more metals or other materials with suitable properties. Bimetal is also called thermal bimetal. Due to the different coefficients of thermal expansion of each component layer, when the temperature changes, the deformation of the active layer is greater than that of the passive layer, so the whole bimetal will bend to the passive layer side. , Then the curvature of this composite material changes and deforms. Among them, the higher expansion coefficient is called the active layer; the lower expansion coefficient is called the passive layer. However, with the expansion of bimetallic applications and the advancement of combining technology, three-layer, four-layer, and five-layer bimetal have appeared in modern times. In fact, all composite materials that change in shape depending on temperature changes are still called thermal bimetals. The material of the active layer is mainly manganese-nickel- copper alloy, nickel-chromium-iron alloy, nickel-manganese-iron alloy and nickel, etc.; the material of the passive layer is mainly nickel-iron alloy, with a nickel content of 34-50%. Bimetallic relays Bimetallics are widely used in relays, switches, controllers, etc. The starter of a fluorescent lamp is a good example. In addition, a thermometer can be made of bimetallic strips, which can measure higher temperatures. TheBi-metal hole saws can cut all machinable metals, wood, nailed wood, plastic, chemical fiber glass, drywall, fiberboard and composite materials including stainless steel. The standard cutting depth is 1-1/2", and the workpiece with a size of 2*4'S can be cut. No additional shaft is required for operation.