+19/-0 micrometres for H6 over 50mm up to 80mm dia
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1000 mm = 1 m so 70 mm = 70/1000 = 0.07 metres. Simple!
10 mm = 1 cm 20 mm = 2 cm 30 mm = 3 cm . . 70 mm = 7 cm
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The tolerance for a 6.35 H7 hole is defined by the H7 system, which specifies a certain range of limits for the hole's diameter. For a 6.35 mm nominal size, the H7 tolerance range typically allows for a hole diameter of 6.35 mm +0.025 mm to +0.000 mm, meaning the diameter can range from 6.35 mm to 6.375 mm. This tolerance ensures a precise fit, suitable for applications requiring a specific clearance or interference fit with corresponding shafts.
One cm contains 10 mm. So, 7 x 10 = 70 mm.