Processed according to H8 and H7 precision in the

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The allowance for machining pre cast or hot punched holes according to H8 and H7 precision in casting

note: 1. If the cast hole has a large machining allowance and it is composed of multiple parts, the first rough boring (2) when the forming pressure, mold design, temperature and other conditions are poor, it can be divided into two or more rough boring

2. If only one-time semi fine boring is carried out, the machining allowance is the sum of the machining allowance of semi fine boring, rough reaming or secondary semi fine boring, which is the world's first poor in terms of production and sales volume, inventory and the number of charging piles built due to the common sense of machine operation

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