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  • BSI
    BS 1660-1:1992, ISO 296:1991 Machine tapers - Specification for shanks and sockets with self-holding tapers (Morse and metric 5%)
    Edition: 1992
    $266.02
    / user per year

Description of BS 1660-1:1992 1992

This International Standard specifies the dimensions of self-holding tapers for tool shanks with a small taper of about 4 % to 5 %, classified, according to their use, into the three following catergories:

  1. tapers for general use;
  2. smaller tapers;
  3. larger tapers.

For the first category, tapers recommended by ISO are Nos. 1 to 6 Morse tapers. Their standard sizes in millimetres are given in Table 2, and the corresponding sizes in inches are given in Table 3.

For smaller and larger tapers, those recommended by ISO are, on the one hand, Nos. 4 and 6 metric 5 % tapers and No. 0 Morse taper, and on the other hand, Nos. 80 to 200 metric 5 % tapers, the sizes of which, in millimetres only, are given in Table 2. However, it was agreed to include in parallel, in the category of small tapers, Nos. 1 to 3 Brown & Sharpe tapers, the sizes of which, in inches only, are given in Table 3.

Consequently, as shown in Table 1, the self-holding tapers dealt with in this International Standard include

  1. for general use, only Nos. 1 to 6 Morse tapers;
  2. for sizes below No. 1 Morse taper, two solutions, i.e. either Nos. 4 and 6 metric tapers and No. 0 Morse taper (without corresponding tapers in inches in Table 3) or, alternatively, Nos. 1 to 3 Brown & Sharpe tapers (without corresponding tapers in millimetres in Table 2);
  3. for sizes above No. 6 Morse taper, only Nos. 80 to 200 metric tapers (without corresponding tapers in inches in Table 3).

Table 1 – Tapers

Designation Sizes in millimetres Sizes in inches
Small tapers Nos. 4 and 6 metric and No. 0 Morse Nos. 1 to 3 Brown & Sharpe
Tapers for general use Nos. 1 to 6 Morsea
Large tapers Nos. 80 to 200 metric –
a Except for threads, Nos. 1 to 6 Morse tapers, manufactured either to metric values or to inch values, are strictly interchangeable, though not absolutely identical.

This International Standard provides, for those elements which are threaded, two entirely distinct types of product according to the type of thread, M or UNC.

In order to distinguish between those two types, it is important that the element itself be marked with the corresponding thread symbol and the type of taper symbol, as shown in the figures in clause 4. Lastly, this International Standard specifies the dimensions of grooves and holes necessary for the design of tapers for applications where coolant supply is required.



Specifies dimensions of tapers for use on small tools where the tools may be used in applications with or without coolant supplies.

Standard NumberBS 1660-1:1992, ISO 296:1991
TitleMachine tapers - Specification for shanks and sockets with self-holding tapers (Morse and metric 5%)
StatusUnder Review
Publication Date1992-01-31
ReplacesBS 1660-1:1988
Identical National Standard OfISO 296:1991
DescriptorsImperial system, Dimensions, Tapered, Machine tool components, Marking, Sockets (threaded), Machine tapers, Tool shanks, SI system (metric), Tool-holding devices, Size
ICS25.060.20 Dividing and tool-workpiece holding devices
CommitteeW/-
ISBN0 580 20362 X
PublisherBSI
Pages12

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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