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Housings for hydraulic control devices used mainly on heavy machine tools. These housings, machined from grade DIN 1693; GGG 60 (German Standard), (continuously cast Ductile Iron) must withstand up to 500 atmospheres (7,000 psi) internal pressure. |
The nuts machined from a Ductile Iron sleeve casting cost more than nuts machined from steel bar stock. Still, the choice was Ductile Iron. The reason: the presence of face graphite in the Ductile Iron structure provides for a unique self-lubricating feature in service.
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