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To control wall thickness, min distance, or min stock removal
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Min wall thickness = ??
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When hole pattern is used as a datum reference. Remainder of part defined from this datum.
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Moved the "0.3" from TOP callout to the size tolerance.
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Manufacturing can divide the available tolerance between SIZE and LOCATION to best suit the process for the part.
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0.4 total available tol could be split unequaly if required by mfg process, so that: 2T = T1 + T2null
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Applies only with Projected Tolerance Zone modifier !!
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For no "P" callouts: H = F + T1 + T2 (1 + (2P)/D), where:nullH = Min clearance hole Dia (MMC)nullT1 = TOP clearance holenullT2 = TOP tapped/dowel holenullD = Min depth of engagement of threaded or dowel membernullP = Max projection of fastener