Piston nut Piston nuts are made of various materials, depending on their strain and purpose. We can manufacture piston nuts for various piston rod sizes and designs. You May LikeReciprocating Compressor Piston RingsCross Head BushingOil Wiper RingCrosshead PinReciprocating Compressor CrankshaftPacking Sealing RingReciprocating Compressor Cylinder