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ISO 296

2nd Edition, April 1, 1991

Complete Document

Machine Tools - Self-Holding Tapers for Tool Shanks



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Description / Abstract:

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:

a) tapers for general use;

b) smaller tapers;

c) larger tapers.

For the first category, tapers recommended by IS0 are Nos. 1 to 6 Morse tapers. Their standard sizes in millimetres are given in table2, and the corresponding sizes in inches are given in table3.

For smaller and larger tapers, those recommended by IS0 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 table2. 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

a) for general use, only Nos. 1 to 6 Morse tapers;

b) 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 table3) or, alternatively, Nos. 1 to 3 Brown & Sharpe tapers (without corresponding tapers in millimetres in table2);

c) for sizes above No. 6 Morse taper, only Nos. 80 to 200 metric tapers (without corresponding tapers in inches in table3).

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.

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