According to the national standard "Stainless Steel Cold-rolled Sheets and Strips" (GB/T 708-2019), the allowable deviation range of 304 stainless steel plate thickness is as follows:

1. For plates with a thickness of less than or equal to 4mm, the allowable deviation range is ±0.3mm.
2. For plates with a thickness greater than 4mm, the allowable deviation range is ±0.5%.

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