ASME B18.2.3.2M:2005 pdf free download

ASME B18.2.3.2M:2005 pdf free download.Metric Formed Hex Screws.
The largest opening in the fitting shall govern the tolerance to be applied to all openings.
9.3 OvaLity of Fitting End (C or FTG)
Maximum ovality of the fitting solder-joint end shall not exceed 1% of the maximum diameters shown in Table 1 (Table lI-i). The average of the maximum and minimum diameters shall be within the dimensions shown in the Table.
9.4 Inside Diameter of Fitting
The minimum cross-sectional area of the inside diameter through the fitting body shall not be less than the theoretical minimum area defined by diameter 0 in Table 1 (Table Il-i). The out-of-roundness condition of the cross-sectional area shall not exceed the value shown in Table I (Table Il-I).
For reducer or adapter fittings, the smallest end diameter shall apply, provided that this diameter does not restrict the other outlets.
9.5 Wall Thickness
The minimum wall thickness shall not be less than that shown in Table 1 (Table Il-I).
10 THREADED ENDS
Fitting threads shall be right-hand, conforming to ASME 81.20.1. They shall be taper threads (N19).
10.1 Countersink or Chamfer
All internal threads shall be countersunk a distance no less than one-half the pitch of the thread, at an angle of approximately 45 deg with the axis of the thread. All external threads shall be chamfered at an angle of 30 deg to 45 dcg from the axis. Countersinking and chamfering shall be concentric with the threads.
The length of threads shall be measured to include the countersink or chamfer.
10.2 Threading Tolerances
Tapered pipe threads (NPT) shall be checked by use of plug or ring gages in either standard or limit types. When gaging internal taper threads, the plug gage shall
(a) This Standard covers the complete dimensional and general data for metric formed hex screws recognized as American National Standard. Formed hex screws are cold formed products with fully upset (non-trimmed) heads. Formed hex screws are standard only in sizes MS thru M24, with lengths up to 150 mm, or 10 times nominal screw size, whichever is shorter.
(b) The inclusion 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 production formed hex screws.
2 COMPARISON WITh ISO STANDARDS
(a) Because of numerous differences betwcvn this Standard and ISO 4015, a detailed summary is included in Appendix C.
(h) At its meeting in Vama, May 1977, ISO/TC2 studied several technical reports analyzing design considerations influencing determination of the best series of width across flats 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.
M10 screws with 15 mm width across flats are currently being produced and used in the US. and many other countries. This size, however, is not an ISO standard. Unless MI0 screws with 15 mm width across flats are specifically ordered, M10 screws with 16 mm width across flats shall be furnished.
fr) 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.
3 TERMINOLOGY
For definitions of terms relating to fasteners or component features thereof used in this Standard, refer to American National Standard ASME B18.12.