Profile: Teignbridge Propellers supplies propellers and sterngear. Temet 25 is a stainless steel marine shaft material. It is a special high strength duplex stainless steel alloy with outstanding resistance to corrosion in seawater which makes it an ideal material for marine shafts. It is available in standard sizes to suit commercial and recreational boat applications. Our flexible couplings consist of a contoured flexible disc molded in, tough yet resilient, new type polyurethane. The contoured disc gives clearance for the bolt heads, and is able to flex freely to take up any temporary mis-alignment of the engine and shaft due to flexing of the boat structure, or the engine moving on its rubber vibration isolation mountings. Forward thrust is taken in compression on the disc between the two half couplings, and reverse thrust is taken again in compression on the disc between the two fail safe straps.