Description

ASME B1.3 – Screw Thread Gaging Systems for Acceptability: Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ)

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GENERAL

(a) This Standard presents screw thread gaging systemssuitable for determining the acceptability of UN,UNR, UNJ, M, and MJ screw threads on externally andinternally threaded products. It establishes the criteriafor screw thread acceptance when a gaging system isused.

(b) A screw thread gaging system comprises a list ofscrew thread characteristics that must be inspected/evaluated to establish the acceptability of the screwthreads on a threaded product and the gage(s) whichshall be used when inspecting/evaluating those characteristics.

(c) Federal Government Use. This Standard isapproved by the Department of Defense and federalagencies, and is incorporated into FED-STD-H28/20,Screw Thread Standards for Federal Services, Section20. The use of this Standard by the federal governmentis subject to all the requirements and limitations ofFED-STD-H28/20.