ASME B1.13M pdf download METRIC SCREW THREADS: M PROFILE
This Standard contains general metric standards fora 60 deg symmetrical screw thread with a basic ISo68-1 profile designated M profile.The M profile threadsof tolerance class 6H/6g are intended for metric applica-tions where inch class 2A/2B have been used. At theminimum material limits, the 6H/6g results in a looserfit than the 2A/2B. Tabular data is also provided fora tighter tolerance fit external thread of class 4g6g,which is approximately equivalent to the inch class3A but with an allowance applied. Formulation andtolerancing data is included for applications requiringother fits.
NOTE: A 4H5H4h6h is approximately equivalent to a class 3A/3Bfit in the inch system.
Threads produced to this Standard are fully inter-changeable with threads conforming to other NationalStandards which are based on ISO 68-1 basic profileand ISO 965-1 tolerance practices.
1.2.1 Assembly.Threads produced in accordancewith M profile and MJ profile (ASME B1.21M) designdata will assemble with each other. However,externalMJthreads will encounter interference on the root radiiwith internal M thread crests when both threads areat maximum material condition.
The latest issues of the following documents forma part of this Standard to the extent specified herein.ASME B1.3,Screw Thread Gaging Systems for Dimen-sional Acceptability — Inch and Metric ScrewThreads (UN，UNR,UNJ，M and MJ)
ASME B1.7M，Nomenclature，Definitions，and LetterSymbols for Screw Threads
ASME B1.16M, Gages and Gaging for Metric M ScrewThreads
ASME B1.21M，Metric Screw Threads: M Profile
ASME B1.30,Screw Threads —Standard Practice forCalculating and Rounding Dimensions
ASME B47.1，Gage Blanks
ASME Y14.5，Dimensioning and Tolerancing
Publisher: The American Society of Mechanical Engi-neers (ASME)，Three Park Avenue，New York,NY10016-5990;Order Department: 22 Law Drive,Box2900，Fairfield,NJ 07007-2900
ASTM F568M，Standard Specification for Carbon andAlloy Steel Externally Threaded Metric FastenersPublisher: The American Society for Testing and Materi-als (ASTM)，100 Barr Harbor Drive,West Consho-hocken，PA 19428-2959
ISO 3,Preferred numbers-—Series of Preferred NumbersISO 68-1,ISO General Purpose Screw Threads—BasicProfile-Part 1: Metric Screw Threads
ISO 261, ISO General Purpose Metric Screw Threads —General Plan
ISO 724,ISO Metric Screw Threads–Basic DimensionsISo 898-1，Mechanical Properties of Fasteners–Part1: Bolts，Screws，and Studs
ISo 965-1，Iso General Purpose Metric ScrewThreads–Tolerances-Part 1: Principles and BasicData
Publisher: International Organization for Standardization(ISO), 1 rue de Varembe,Case Postale 56,CH 1211,Geneve 20,Switzerland / Suisse
SAE J1199,Mechanical and Material Requirements forMetric Externally Threaded Steel Fasteners
Publisher: Society of Automotive Engineers (SAE),400Commonwealth Drive，Warrendale,PA 15096-0001
Acceptability of product threads shall be in accor-dance with ASME B1.3. Gages and gaging are inaccordance with ASME B1.16M.
1.5 Reference Temperature
The reference temperature is 20°C for dimensionsdefined by this system.