The nut and bolt deviations and tolerance zones are illustrated here. Click below to download Thread Gage Pitch Diameter Chart. For external threads class 6e may be used as a pre-plating condition for 6g after plating. Class X Plug Gages Cylindrical Gages & Master Discs for Tri-Rolls & Thread Master Ring Gages Thread Ring Gages Plain Plug and Ring Gages Pin Gage Sets and Replacements with NIST CERTIFICATION Gage Tolerance Chart . The basic profile of the ISO threads is shown below. As an example, a common screw thread tolerance is 5g6g, which has a 5g tolerance on its pitch diameter, and a 6g tolerance on its external diameter. Determination Of Pitch Diameter Parallel Thread Gauges By. Click to see the full image. 6g or any other class as per customer requirement: Plain Plugs to check Minor … When ordering gauges for other plating conditions it is helpful to advise either the effective diameters required, or the amount of plating to be applied. Thread Plug Gage Tolerance Chart Thread Plug Gage Tolerance Chart PDF [BOOK] ... Gauges Pin gauges Thread and tolerance tables. CALL US: 1 866 - WILLRICH (945-5742) ... Thread Gage Pitch Diameter Chart. Metric Thread Gages Gage Assembly. The reason that the values for tolerance bands (signified by letters, found in table 1) are written as positive and negative numbers, and the values for tolerance classes (written as numbers, found in tables 2 - 5) are not, is because tolerance classes are applied interchangeably to both internal and external threads, and must be either subtracted or added to a tolerance, dependent on whether the thread is internal or external. 11.2 Gauges for internal threads of workpieces. 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