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Preferred Limits and Fits for Cylindrical Parts B4.1-1967

Preferred Limits and Fits for Cylindrical Parts B4.1-1967               Preferred Limits and Fits for Cylindrical Parts B4.1-1967


Preferred Limits and Fits for Cylindrical Parts B4.1-1967

This standard presents definitions of terms applying to fits between plain (non-threaded)
cylindrical parts and makes recommendations on preferred sizes, allowances, tolerances, and fits
for u s e wherever they are applicable. The standard through 20 in. diameter i s in accord with the
recommendations of American-British-Canadian Conferences. Experimental work i s being carried
on and when results are available, agreement in the range above 20 in. will be sought. It represents
the combined thinking and experience of groups who have been interested in standards in this field, and it should have application for a wide range of products. The recommendations, therefore, are presented for guidance and for use where they might serve to improve and simplify products, practices, and facilities.



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