USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
CONVERSION CHART - METERS TO FEET.
(b) Classes 2A and 2B, Medium Fit.
This fit permits wrenching
with minimum galling and seizure.
This medium fit is suited for the
majority of commercial fasteners and is interchangeable with the American
National Class II fit.
(c) Classes 3A and 3B, Close Fit.
No allowance is provided.
Applications are those where close fit and accuracy of lead and thread angle
(3) Tables. Thread dimensions as shown in figures 156 and 157 on the
following pages are the most commonly used in the United States.
additional columns of tap drill sizes are included for quick reference.