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Metric Threads - Clearance Holes and Tapping Drill Sizes

Recommended clearance holes and drill tap sizes.

Clearance holes for metric bolts:

Metric Threads - Clearance Holes and Tapping Drill Sizes
Size
Nominal Diameter
(mm)
Pitch
(mm)
Clearance Hole
(mm)
Tap Drill
Standard Pitch
(mm)
FineMediumCoarse
1.6 0.35 1.7 1.8 2
1.8 0.35 2.0
2 0.40 2.2 2.25 2.6
2.2 0.45 2.45
2.5 0.45 2.7 2.8 3.1
3 0.50 3.2 3.35 3.6
3.5 0.60 3.9
4 0.70 4.3 4.5 4.8
4.5 0.75 5.0
5 0.80 5.3 5.5 5.8 4.2
6 1.00 6.4 6.5 7 5
7 1.00 7.4 7.8 8
8 1.25 8.4 9 10 6.75
10 1.50 10.5 11 12 8.5
12 1.75 13 14 15 10.25
16 2.0 17 18 19 14
20 2.5 21 22 24 17.5
24 3.0 25 26 28 21
30 3.5 31 32 35 26.5

Related Topics

  • Fasteners

    Bolts, nuts and threaded rods - torque, tension and loads.
  • Threads

    Thread data - metric, unified, ACME and others.

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