Fit

Fit or FIT may refer to:

As a word

Fit may refer to:

Fitness

Other uses

FITS

Flexible Image Transport System (FITS) is an open standard defining a digital file format useful for storage, transmission and processing of scientific and other images. FITS is the most commonly used digital file format in astronomy. Unlike many image formats, FITS is designed specifically for scientific data and hence includes many provisions for describing photometric and spatial calibration information, together with image origin metadata.

The FITS format was first standardized in 1981; it has evolved gradually since then, and the most recent version (3.0) was standardized in 2008. FITS was designed with an eye towards long-term archival storage, and the maxim once FITS, always FITS represents the requirement that developments to the format must be backwards compatible.

A major feature of the FITS format is that image metadata is stored in a human-readable ASCII header, so that an interested user can examine the headers to investigate a file of unknown provenance. The information in the header is designed to calculate the byte offset of some information in the subsequent data unit to support direct access to the data cells. Each FITS file consists of one or more headers containing ASCII card images (80 character fixed-length strings) that carry keyword/value pairs, interleaved between data blocks. The keyword/value pairs provide information such as size, origin, coordinates, binary data format, free-form comments, history of the data, and anything else the creator desires: while many keywords are reserved for FITS use, the standard allows arbitrary use of the rest of the name-space.

Fit (manufacturing)

In precision mechanics, fit refers to the degree of 'looseness' with which an shaft is inserted into an orifice.

This coupling is related to the tolerance or allowance of both parts dimensions. The shaft and the orifice must be of a similar diameter, otherwise there will not be a correct adjustment. With this in mind, measurements have been internationally standarised according to ISO regulation to ensure the interchangeability of items and their mass production.

Tolerance values are designated with a capital letter in the case of orificies and lower case letters in the case of shafts. The lower the value the higher the machining costs, as a greater precision is required.

Maximum and minimum clearance

The maximum clearance of a fit is the difference between the upper bound of the orifice diameter and the lower bound of the shaft diameter.

The minimum clearance meanwhile is the difference between the lower bound of the orifice diameter and the upper bound of the shaft diameter.