National Physical Laboratory

MOY/SCMI Specifications Information

MOY/SCMI example
MOY/SCMI example

What are MOY/SCMIs?

In the 1940s and 1950s, NPL was involved in drafting a special series of Specifications of Accuracy that covered a wide range of precision measuring apparatus. This series has been built on first hand experience gained in the design and construction of prototype measuring equipment at NPL and in the design and calibration of measuring equipment of British and foreign manufacture. Each specification in the series originally conformed to a general pattern and was allocated a permanent serial number which, in addition to its title, serves as its identity. In total there are 68 MOY/SCMIs.

The MOY/SCMI (Metrology/Specification Certification Measuring Instruments) standards are complementary to the Standards issued by the British Standards Institute (BSI). The majority relate to measurement equipment of a proprietary kind designed either at NPL or by British manufacturers which, in the ordinary way, would not fall within BSI's terms of reference. In some cases, in which the equipment is of a more general nature, the Specification has provided a useful basis for formulating a British Standard. The specifications are to enable manufacturers to base their inspection on mutually agreed specifications of accuracy both in workmanship and performance.

More information on MOY/SCMIs can be found in Proceedings of a symposium held at the National Physical Laboratory on October 21, 22, 23 and 24, 1953, Volume II Paper 40 Specifications of Accuracy for use in Engineering Inspection by C O Taylerson HMSO 1955.

Catalogue  |  Download MOY/SCMIs

A page showing all the MOY/SCMIs is available. The webpage view has links to PDF versions of the documents that can be downloaded for printing or viewing. (These files may take several minutes to download, depending on your Internet connection).

The documents have been optimised for screen or printer. If you are only going to view the document on the screen download the screen-optimised file. If you are going to produce hard copy download the printer-optimised file (this may take several minutes).

A full list of all MOY/SCMIs in PDF format (PDF File PDF 6.7 KB) is also available for printing or viewing.

New versions

Recently several MOY/SCMIs have been updated, and some have also been combined, as part of a project financed by the DTI (MPU 8/61.3) concerned with Good Practice Guides and Equipment Specifications. The MOY/SCMIs that were updated were chosen after consultation with users and are 9, 18, 22, 36, 37, 54, 55, 60, 61 and 95.

All MOY/SCMIs, including the 10 updated ones, have also been made available in electronic format (PDF).

Last Updated: 19 Aug 2014
Created: 22 Jun 2010

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