Abstract： ASME B18.2.3.3M:2007 pdf download.Metric Heavy Hex Screws. 2.1.5 True Position of Head. At maximum material condition, the axis of the hex head shall be located at true position with respect to the axis of the screw (determined over a dista...

ASME B18.2.3.3M:2007 pdf download.Metric Heavy Hex Screws.

2.1.5 True Position of Head. At maximum material condition, the axis of the hex head shall be located at true position with respect to the axis of the screw (determined over a distance under the head equal to one screw diameter) within a tolerance zone of

diameter specified in Table I.

2.1.6 Bearing Surface. The bearing surface shall be flat and washer-faced. Diameter of bearing surface shall not exceed the width

across flats nor be less than the specified minimum washer face diameter. For referee purposes, measurement of bearing surface

diameter shall be taken at 0.1 mm above the bearing surface. The plane of the bearing surface shall be perpendicular to the axis of the body within the circular runout specified in Table 2. The measurement of bearing face runout shall be made as close to the

periphery of the washer face as possible, while the screw is held in a collet or other gripping device at a distance equal to one

screw diameter from the underside of the head.

2.1.7 Underhead Fillet. The fillet configuration at the junction of the head and shank shall be as shown in Figs. I and 2, and

shall have limits as specified in Table 3. The fillet shall be a smooth and continuous curve fairing smoothly into the underhead

bearing surface and the shank within the limits specified. No radius in the fillet contour shall be less than R minimum.

2.2 Body Diameter

The diameter of the body on screws that are not threaded full length shall be within the limits specified in Table 2. For screws

threaded full length, the diameter of the unthreaded shank under the head shall not exceed the specilied maximum body diameter, nor be less than the minimum body diameter specified in Table I.

2.3 Screw Length

The length of the screw shall be measured parallel to the axis of the screw from the underhead bearing surface to the extreme end

of the shank. Tolerances for screw lengths are given in Table 4.

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