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Small metal parts with complex shapes or intricate details that might challenge the capabilities of machining processes can be moulded from powdered stainless steel and other metals by a contract specialist in metal injection moulding. The more complex the shape, says Metal Injection Mouldings Ltd (Altrincham, UK; www.metalinjection.co.uk), the more economically advantageous the moulding process will be compared with other metal forming techniques. The consistent, efficient process is suited for disposable parts as well as any metal component that would be difficult to machine from solid stock. It accommodates close-tolerance requirements and can result in fine surface finishes.

Part features that can be moulded from metal include fine gear teeth, serrations, lettering, and nonround holes. Blind holes are as easy to produce as through holes, and internal or external threads can be included in the mould. Nickel- and cobalt-based alloys, carbon steels, tool steels, and magnetic irons, as well as stainless steel, are used to produce moulded medical and surgical components, hand tools, and precision equipment weighing up to 100 g.