Screw Machine Shops

Screw machine shops manufacture screws and other turned or threaded parts from metals, plastics, and composite materials. Screw machining turns the feed stock, faces and cuts the part, partitions an individual screw or part, and then advances the rod to cut the next part. As a rule, turned parts have extremely tight tolerances. Screw machine shops differ in terms of material capabilities and applications. Commonly used metals include aluminum, brass, bronze, copper, nickel, hardened metals, precious metals, steel, tool steel, stainless steel, and steel alloys. Screw machine shops that specialize in turning plastic parts or working with composite materials are also available.

Screw machine shops may provide additional services such as CAD/CAM support, design assistance, just-in-time (JIT) delivery, rapid prototyping, low-volume production, and high-volume production. Computer aided design or drafting (CAD) is used to design parts quickly and accurately. Computer aided manufacturing (CAM) is used to fabricate products directly from CAD outputs. Screw machine shops that provide design assistance can help customers with concepts, manufacturing costs, manufacturing techniques and material considerations such as sourcing. They may also be able to assist with upgrading, redesigning, reevaluating or modernizing existing products to increase performance and/or reduce manufacturing costs. Some screw machine shops have just-in-time (JIT) manufacturing capabilities or can provide prototypes for use in presentations or functional testing. Others provide low-volume or high-volume production.

Screw machine shops are located across the United States and around the world. They adhere to a variety of certifications, regulatory requirements, and quality standards. Screw machine shops follow four main specifications from the International Standards Organization (ISO): ISO 9001:2000, ISO 13485:2003, ISO 14001, and ISO/TS 16949:2002. AS 9000, AS 9100, and QS-9000 are industry-specific quality standards that are based on ISO 9001. Both AS 9000 and AS 9001 define quality management system (QMS) requirements for suppliers to the aerospace industry. QS-9000 is a quality standard for suppliers of DaimlerChrysler Corporation, Ford Motor Company, and General Motors Corporation. Some centerless grinding services are registered with the Food and Drug Administration (FDA), or comply with U.S. military specifications (MIL-SPEC). Others meet internal company specifications or requirements from original equipment manufacturers (OEM).

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