The British Turned Parts Manufacturers Association (BTMA) is the recognised trade association for UK companies manufacturing precision turned parts and machined components. Our role is simple: to support, promote, and represent the businesses that form the backbone of the UK’s precision engineering supply chain. Full membership is open to UK manufacturers whose core activity is the repeat production of precision turned parts and/or machined components, typically with at least 50% of turnover derived from subcontract manufacturing. Companies supplying equipment, materials, or specialist services to the sector may apply for Associate Membership.