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  • BSI
    BS 3777:1964 Specification for screw thread measuring cylinders
    Edition: 1964
    $305.31
    / user per year

Description of BS 3777:1964 1964

This British Standard relates to two grades of screw thread measuring cylinders intended for use in checking external screw threads by means of pitch diameter measuring machines.

NOTE For a full description of this well established method of measuring the effective diameter of an external screw thread when using thread measuring cylinders, and also for an explanation of the P value used in this measurement, see “Notes on Applied Science No.1” issued by the Department of Scientific and Industrial Research and entitled “Gauging and Measuring Screw Threads”, published by Her Majesty’s Stationery Office.

The standard comprises two parts:

Part 1 gives the bases for the diametral tolerances of Grade A and Grade B screw thread measuring cylinders and the relative merits of the two grades.

Part 2 gives the complete specification for both grades of cylinders suitable for the forms and pitches of screw threads shown in Table 1.



Grade A (pitch-line) and Grade B (grouped) measuring cylinders for checking external screw threads of Unified and ISO inch, Whitworth, B.A. and ISO metric form by means of pitch diameter measuring machines. Bases for the diametral tolerances. Relative merits of grades A and B. Measuring ranges, material and finish, form and general dimensions, accuracy and identification; tables of nominal diameters and associated P values for Grade A cylinders; limits of size for Grade B cylinders.

Standard NumberBS 3777:1964
TitleSpecification for screw thread measuring cylinders
StatusConfirmed
Publication Date1964-08-17
Replaced ByBS 5590:1978
DescriptorsDimensions, Marking, Whitworth screw threads, ISO metric threads, Unified screw threads, External threads, Length, Diameter, Thread pitch, Measuring instruments, Threads, Imperial system, Thread gauges, Thread forms, British Association screw threads
ICS17.040.30 Measuring instruments
CommitteeTPR/1
ISBN0 580 03698 7
PublisherBSI
Pages16



About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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