Air Products reciprocating compressor
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Dresser-Rand reciprocating compressor.


The piston is fastened to the connecting rod by means of a large nut. When attaching the piston, the connecting rod must be properly crimped. Then the nut must be tightened with a high degree of torque. At the time of fixing, the rod disconnected itself and was damaged. In some cases, the rod breaks on disassembly because the forces sustained are even higher. In both cases, the assembler can be injured.


To attach the piston to the connecting rod, a specially designed Superbolt nut was used. As the nut fits precisely on the piston, there is no protrusion.


Thanks to the use of the Superbolt, much less force is required to secure the piston (about 1/15). The risks of damage and injury are therefore greatly reduced.