Abstract： ASME B18.2.3.2M:2005 pdf download.Metric Formed Hex Screws. b) The indusion of dimensional data in this Standard is not intended to imply that all of the sizes in conjunction with the various options described herein are stock items Consume...

ASME B18.2.3.2M:2005 pdf download.Metric Formed Hex Screws.

b) The indusion of dimensional data in this Standard is not intended to imply that all of the sizes in conjunction with the various options described herein are stock items Consumers should consult with suppliers concerning lists of stock prod uction formed hex

screws.

2 COMPARISON WITH ISO STANDARDS

(a) Because of numerous differences between this Standard and ISO 4015, a detailed summary is included in Appendix C.

(b) At its meeting in Varna, May 1977, lSO/TC2 studied several technical reports analyzing design considerations influencing

determination of the best series of width across fbts for hexagon bolts, screws, and nuts. A primary technical objective was to

achieve a logical ratio between underhead (nut) bearing surface area (which determines the magnitude of the compressive stress on

the bolted members) and the tensile stress area of the screw thread (which governs the clamping force that can be developed by

tightening the fastener). Table I lists the sizes selected by ISO/TC2 to be ISO standard,

MlO screws with 15 mm width across flats are currently being produced and used in the U.S. and many other countries. This size,

however, is not an ISO standard. Unless MIt) screws with 15 mm width across flats are specifically ordered. MW screws with 16 mm

width across flats shall be furnished.

(c) Letter symbols designating dimensional characteristics are in accord with those used in ISO standards. except that capital

letters have been used instead of the lower case letters used in ISO standards.

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