Quality, GD&T & Compliance
Plain-English definitions of the terms you'll come across.
terms categories
What Is a Certificate of Conformance (CoC)?
Certificate of conformity
A certificate of conformance (CoC) is a signed statement from a supplier that a shipment of parts or material meets the requirements of the purchase order, drawing and specifications.
Read moreWhat Is Concentricity? GD&T Definition & Status
Concentricity means that two or more round features share the same center axis; in GD&T it was a tolerance on feature midpoints relative to a datum axis, but ASME Y14.5-2018 removed the symbol.
Read moreWhat Is IATF 16949? Automotive QMS Definition
IATF 16949 is the international quality management system standard for the automotive supply chain, published by the International Automotive Task Force in October 2016 as a supplement to ISO 9001:2015.
Read moreNon-Conformance Report (NCR)
NCR report
A non-conformance report (NCR) is a formal record that a part, material or process does not meet a specified requirement.
Read moreWhat Is a Runout?
Runout is a GD&T tolerance that limits how much the surface of a round part varies as the part rotates 360° about a datum axis.
Read moreWhat Is True Position? GD&T Definition & MMC
position tolerance
True position is the theoretically exact location of a feature, such as a hole or pin, defined by basic dimensions from a datum reference frame. A position tolerance then sets a zone, usually a cylinder of stated diameter, within which the feature's actual axis or center plane must fall.
Read more