TAP DRILLING SIZES DRILLED HOLE SIZE
| Metric Coarse Screw Threads |
Metric Fine Screw Threads |
UNC Screw Threads |
UNF Screw Threads |
||||
|---|---|---|---|---|---|---|---|
| Thread Size | Drill Dia. MM | Thread Size | Drill Dia. MM | Thread Size | Drill Dia. MM | Thread Size | Drill Dia. MM |
| M1X0.25 | 0.75 | M2.6×0.45 | 2.15 | No 1×64 UNC | 1.55 | No 0x80 UNF | 1.25 |
| M1.2X0.25 | 0.95 | M3X0.35 | 2.65 | 2X56 | 1.8 | 1X72 | 1.55 |
| M1.4X0.3 | 1.1 | M3.5X0.35 | 3.15 | 3X48 | 2.1 | 2X64 | 1.85 |
| M1.6X0.35 | 1.25 | M4X0.5 | 3.5 | 4X40 | 2.3 | 3X56 | 2.1 |
| M1.8X0.35 | 1.45 | M4.5X0.5 | 4 | 5X40 | 2.6 | 4X48 | 2.4 |
| M2X0.4 | 1.6 | M5X0.5 | 4.5 | 6X32 | 2.8 | 5X44 | 2.7 |
| M2.2X0.45 | 1.75 | M5X0.75 | 4.25 | 8X32 | 3.4 | 6X40 | 2.9 |
| M2.5X0.45 | 2.05 | M6X0.5 | 5.5 | 10X24 | 3.9 | 8X36 | 3.5 |
| M3X0.5 | 2.5 | M6X0.75 | 5.25 | 12X24 | 4.5 | 10X32 | 4.1 |
| M3.5X0.6 | 2.9 | M7X0.5 | 6.5 | 1/4X20 | 5.1 | 12X28 | 4.6 |
| M4X0.7 | 3.3 | M7X0.75 | 6.3 | 5/16X18 | 6.6 | 1/4X28 | 5.5 |
| M4.5X0.75 | 3.75 | M8X0.5 | 7.5 | 3/8X16 | 8 | 5/16X24 | 6.9 |
| M5X0.8 | 4.2 | M8X0.75 | 7.25 | 7/16X14 | 9.4 | 3/8X24 | 8.5 |
| M6X1.0 | 5 | M8X1.0 | 7 | 1/2X13 | 10.8 | 7/16X20 | 9.9 |
| M7X1.0 | 6 | M9X0.75 | 8.3 | 9/16X12 | 12.2 | 1/2X20 | 11.5 |
| M8X1.25 | 6.8 | M9X1.0 | 8 | 5/8X11 | 13.6 | 9/16X18 | 12.9 |
| M9X1.25 | 7.8 | M10X0.5 | 9.5 | 3/4X10 | 16.5 | 5/8X18 | 14.5 |
| M10X1.5 | 8.5 | M10X0.75 | 9.3 | 7/8X9 | 19.5 | 3/4X16 | 17.5 |
| M11X1.5 | 9.5 | M10X1.0 | 9 | 1”X8 | 22.2 | 7/8X14 | 20.5 |
| M12X1.75 | 10.3 | M10X1.25 | 8.8 | 1.1/8X7 | 25 | 1”X12 | 23.2 |
| M14X2.0 | 12 | M11X1.0 | 10 | 1.1/4X7 | 28.2 | 1.1/8X12 | 26.5 |
| M16X2.0 | 14 | M11X1.25 | 9.8 | 1.3/8X6 | 30.8 | 1/4X12 | 29.5 |
| M18X2.5 | 15.5 | M12X0.5 | 11.5 | 1.1/2X6 | 34 | 1.3/8X12 | 32.8 |
| M20X2.5 | 17.5 | M12X0.75 | 11.3 | 1.3/4X5 | 39.5 | 1.1/2X12 | 36 |
| M22X2.5 | 19.5 | M12X1.0 | 11 | 2X4.1/2 | 45.3 | ||
| M24X3.0 | 21 | M12X1.25 | 10.3 | ||||
| M27X3.0 | 24 | M12X1.5 | 10.5 | ||||
| M30X3.5 | 26.5 | M13X1.0 | 12 | ||||
| M33X3.5 | 29.5 | M14X1.0 | 13 | ||||
| M36X4.0 | 32 | M14X1.25 | 12.8 | ||||
| M39X4.0 | 35 | M14X1.5 | 12.5 | ||||
| M42X4.5 | 37.5 | M15X1.0 | 14 | ||||
| M45X4.5 | 40.5 | M15X1.5 | 13.5 | ||||
| M48X5.0 | 43 | M16X1.0 | 15 | ||||
| M52X5.0 | 47 | M16X1.25 | 14.8 | ||||
| M56X5.5 | 50.5 | M16X1.5 | 14.5 | ||||
| M60X5.5 | 54.5 | M18X1.0 | 17 | ||||
| M64X6.0 | 58 | M18X1.5 | 16.5 | ||||
| M68X6.0 | 62 | M18X2.0 | 16 | ||||
| M72X6.0 | 66 | M20X1.0 | 19 | ||||
| M20X2.0 | 18 | ||||||
| M20X1.5 | 18.5 | ||||||
| M22X1.0 | 21 | ||||||
| M22X1.5 | 20.5 | ||||||
| M22X2.0 | 20 | ||||||
| M24X1.0 | 23 | ||||||
| M24X1.5 | 22.5 | ||||||
| M24X2.0 | 22 | ||||||
| M25X1.5 | 23.5 | ||||||
| M25X2.0 | 23 | ||||||
MORE TAP DRILLING SIZES
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