Extemal Thread Root. Upper and Lower Limiting Profiles for r min. Tolerance Position H Tolerance Position g M Profile Since there were some uncertainties as to the acceptance of this thread by American industries, the information was published in August with the title, Interpretative Document Metric Screw Threads B1.
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Bold type indicates products unified dimensionally with British and Cana- dian standards. Unification of fine thread nuts is limited to sizes l in.
True Position of Tapped Hole. Tapped hole shall be countersunk on the bearing face or faces. The maximum countersink diameter shall be the thread basic nominal major diameter plus 0. No part of the threaded portion shall project be- yond the bearing surface.
Nuts of other materials such as corrosion resistant stainless steel, brass, bronze, and alumi- num alloys shall have properties as agreed upon between the manufacturer and pur- chaser. Maximum width across flats shall not be exceeded see excep- tion in General Data. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used. Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits a?
Tops and Bearing Surfaces of Nuts. Larger size nuts shall be double chamfered or have washer faced bearing surface and chamfered top. The surface of chamfer may be slightly convex or rounded. Bearing surfaces shall be flat and perpendicular to the axis of the threaded hole within the FIM limits specified for the respective nut type and strength level..
Metric Screw Threads: M Profile
METRIC EXTERNAL THREAD DIMENSIONS CHART