There are three common quality control standards in the machining industry.

ISO 9001
Released in 1987 by the International Organization for Standardization (ISO), ISO 9001 is one of the most well-known and used quality management systems. It aims to help businesses meet customers’ expectations and maintain quality products.
ISO 16949
It’s also a quality management standard that focuses on the automotive industry, which provides a framework to maximally decrease waste of materials in the supply chains and a high level of security.
AS9100
Finishing with the AS9100 that was made in 1999, focusing on the aerospace industry, this management standard requires more severe control over the product compared to other quality management systems.