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Mechanical Engineering
Ammar Burhani

ASTM D3039 confusing symbol

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Its is geometrical tolerances which show how maximum and minimum allowances bw both surfaces respect to plain A (datum plan). other one is flatness bw both sides. this thing is given when you want to fit one part with another with minimum friction and effort.

for batter understanding please see attachment.

Geo.Tolerance Ref. Chart.pdf

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