Abstract： ASME B18.16M:2004 pdf download.Prevailing-Torque Type Steel Metric Hex Nuts and Hex Flange Nuts. 7 WIDTH ACROSS FLATS The width across flats shall be the distance, measured perpendicular to the axis of the nut, between two opposite wrenchmg...

ASME B18.16M:2004 pdf download.Prevailing-Torque Type Steel Metric Hex Nuts and Hex Flange Nuts.

7 WIDTH ACROSS FLATS

The width across flats shall be the distance, measured perpendicular to the axis of the nut, between two opposite wrenchmg flats.

The maximum width across flats may be exceeded by 0.05 mm to allow for nut deformahon causeti by introdudion of the

prevailing-torque feature, The width acro flats and width across corners m.w he less than the specified minimum in the deformed

portion of the nut containing the prevailing-torque feature.

At maximum material condition the axis of the hexagon shall be located at true position with respect to the axis of the thread

pitch diameter within a tolerance rone having a diameter equivalent to 4% of the maxmum width across flats.

8 THICKNESS

The nut thickness shall be the overall distance, measured parallel to the axis of the nut, from the top of the nut to the bearing

surface of hex nuts, and to the plane of the bearing circle diameter of hex flange nuts. Raised identification markings, if

present, shall be excluded.

9 WRENCHING HEIGHT

The wrenching height is the distance, measured at a corner of the hex, from the bearing surface of hex nuts, and from the juistion of the hex portion with the flange of hex flange nuts to the last plane of full formed hex, i.e., the plane perpendicular to the

nut axis that is closest to the top of the nut and at which the width across corners is within its specified limits. Wrenching

height for hex nuts is dimension M1 in Table 1. and is subject to measurement. Wrenching height for hex flange nuts is dimension T, in Table 2 and is controlled by the gaging requirement specified in para. 10.

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