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2、 STANDARD Hose Coupling Screw Threads(Inch)ASME BI.20.7-1991(REVISION OF ANSVASME B1.20.7-1966)The American Society of Mechanical Engineers _ _ _ 345 East 47th Street,New York,N.Y.1001 7-Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanfor
3、d University User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:April 16,1992 This Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or written interpretations of the re-quirements of this Stand
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10、Reserved Printed in U.S.A.Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.(This Foreword is not part of ASME B1.20.7-1991.)Local standards
11、 for small hose coupling threads in use prior to 1920 were summarized in a table in the Proceedings of the National Fire Protection Association,Vol.24,1920,p.180.Of these,the Standard Iron Pipe Thread had been most widely used,and it had been reliably reported that this thread had been in use for sm
12、all hose couplings since 1894 or earlier.In the case of the three-fourths-inch size,however,11 and 11%threads per inch,with a diameter of 1%6 in.were already in very extensive use for garden hose.It was reported that the first garden hose spray nozzle had been made prior to 1890 in the shops of the
13、W.D.Allen Mfg.Co.,Chicago.In 1918 the Fire Dept.Supply and Linen Hose Section of the War Industries Board rec-ommended that for the duration of the war“hydrants,hose valves,hose couplings,nipples,and nozzles 1%in.to 2 in.,inclusive,to be iron pipe thread for new work,hose gauge or special threads on
14、ly to be used for replacement or extension of existing plant equipment.The adoption of such a standard will result in the elimination of the various so-called hose threads which are used locally in the different sections of the country.Such a standard will also permit repairs or connections being ma
15、de in the field by the use of wrought iron pipe connections or fittings.It will also result in considerable saving in correspondence and detail now necessary in endeavoring to ascertain what particular hose standard thread is desired.”A blueprint of the nominal sizes and pitches of hose thread dimen
16、sions,dated March 5,1918,of the National Association of Brass Manufacturers was furnished the National Screw Thread Commission in November,1918.Limits of size for iron pipe thread sizes and pitches were designed as National hose coupling thread dimensions and adopted by the National As-sociation of Brass Manufacturers March 18,1920.These were in agreement with those in the Progress Report of the N.S.T.C.,approved June 19,1920,and published January 4,1921 as NBS Miscellaneous Publication No.42.A
