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3.5 in drive 147 × 101.6 × 26.1 mm

3.5 in drive 147 × 101.6 × 26.1 mm: 2 × #6-32 each side at 28.50 / 130.10 mm, 6 × #6-32 bottom at 41.28 / 85.73 / 117.48 mm from the connector end

Exact dimensions. True size, no printing tolerance added.

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From the full sheet

3.5 inch hard drive (SFF-8301): every size, notes, mating features and sources. What are the dimensions of a 3.5 inch hard drive?