What materials are best for durable hydraulic hand tools?

 The most durable hydraulic hand instruments, including cutters, crimpers, flaring instruments, torque wrenches, and test kits for pressure, are constructed using chrome-molybdenum (Cr-Mo) or chrome-vanadium (Cr-V) alloy steel to support the load and the hardened steel of tooling (often heated- or induction-hardened up to 50 - 58 HRC) to cut jaws and tools, and corrosion-resistant coatings like black oxide and phosphate or nickel plating to guard against moisture, hydraulic fluid, and shop chemicals. Grips are generally dual-molded with the thermoplastic elastomer that is fluid resistant (TPE) with a glass-filled steel or nylon core to provide shock absorption, without sacrificing the rigidity.

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