JB 3911-1985 万能镗头 制造与验收技术要求

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【英文标准名称】:DrysealPipeThreads(Inch)
【原文标准名称】:干封管螺纹(英制)
【标准号】:ANSI/ASMEB1.20.3-1976
【标准状态】:现行
【国别】:美国
【发布日期】:1976
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:名称与符号;尺寸;管螺纹;管;规范;螺纹
【英文主题词】:Designations;Dimensions;Pipethreads;Pipes;Specification;Threads
【摘要】:DrysealpipethreadsarebasedontheUSA(American)pipethread,however,theydifferfromtheUSA(American)pipethreadinthattheyaredesignedtosealpressuretightjointswithoutthenecessityofusingsealingcompounds.Toaccomplishthissomemodificationofthreadformandgreateraccuracyinmanufactureisrequired.Therootsofboththeexternalandinternalthreadsaretruncatedslightlymorethanthecrests,i.e.rootshavewiderflatsthancrests,sothatmetal-to-metalcontactoccursatthecrestsandrootscoincidentwithorpriortoflankcontact,seeFigure1.Thusasthethreadsareassembledbywrenching,therootsofthethreadscrushthesharpercrestsofthematingthreads.Thissealingactionatboththemajorandminordiameterstendstopreventspiralleakageandmakesthejointspressuretightwithoutthenecessityofusingsealingcompounds,providedthatthematingthreadsareinaccordancewithstandardspecificationsandtolerancesandarenotdamagedbygallinginassembly.Thecontrolofcrestandroottruncationissimplifiedbytheuseofproperlydesignedthreadingtools.Also,itisdesirablethatbothexternalandinternalthreadshavefullthreadheightfortheL1length.However,wherenotfunctionallyobjectionable,theuseofacompatiblelubricantorsealantmaybeusedtominimizethepossibilityofgalling.ThisisdesirableinassemblingDrysealpipethreadsinrefrigerationandothersystemstoeffectapressuretightseal.
【中国标准分类号】:J05
【国际标准分类号】:21_040_20
【页数】:
【正文语种】:英语


Product Code:SAE J818
Title:Rated Operating Load for Loaders
Issuing Committee:Mtc1, Loaders, Crawlers, Scrapers And Mounted Attachments
Scope:This SAE Standard establishes the definition of a normal all day rated operating load for loaders as defined in SAE J1057. This SAE Standard applies to wheel and crawler loaders taking only hydraulic lift capacity and tipping capacity into consideration. It is recognized that specific operating conditions may allow larger, or require smaller loads than the rated operating load. Some conditions could require more careful or restricted operation with the rated operating load. This standard is not to be construed as setting up test procedures or conditions.