2.7 mm drill size
A 2.7 mm metric drill is 0.1063 in (2.700 mm). It is the cut tap, 50% thread drill for M3×0.5.
- Decimal inch
- 0.1063
- Millimeters
- 2.700
- Nearest 1/64
- 7/64" (-0.0031)
- Type
- metric drill
Nearest equivalents in other systems
Speeds and feeds: in mild steel an HSS drill starts at about 3,230 RPM and 0.0025 in/rev (8.07 IPM); in 6061 aluminum about 8,980 RPM.
2.7 mm drill speeds and feeds by material
Jobber-length twist drill, D = 0.1063 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.
| Material | HSS SFM | HSS RPM | Carbide SFM | Carbide RPM | Feed (in/rev) | HSS IPM | Carbide IPM |
|---|---|---|---|---|---|---|---|
| Aluminum (6061) | 250 | 8,980 | 600 | 21,560 | 0.0024 | 21.6 | 51.7 |
| Brass / free-machining | 150 | 5,390 | 400 | 14,370 | 0.0020 | 10.8 | 28.7 |
| Low-carbon steel (1018) | 90 | 3,230 | 300 | 10,780 | 0.0025 | 8.07 | 26.9 |
| Alloy steel (4140, annealed) | 70 | 2,520 | 250 | 8,980 | 0.0025 | 6.30 | 22.4 |
| Stainless 304 | 40 | 1,440 | 150 | 5,390 | 0.0017 | 2.45 | 9.16 |
| Gray cast iron | 80 | 2,870 | 250 | 8,980 | 0.0015 | 4.31 | 13.5 |
| Titanium 6Al-4V | 25 | 900 | 100 | 3,590 | 0.0013 | 1.17 | 4.67 |
| Plastics (acetal) | 300 | 10,780 | 500 | 17,970 | 0.0043 | 46.4 | 77.3 |
Small drills: the computed RPM is above most spindles. Run at your spindle's maximum and keep the feed per rev; feed drops in proportion.
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 3,230 RPM × 0.064 mm/rev = 205 mm/min.
Worked example: 2.7 mm drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.1063 ≈ 3,230 RPM.
- Feed for a 0.106 in drill in mild steel ≈ 0.0025 in/rev.
- IPM = 3,230 × 0.0025 = 8.07 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 0.319 in (8.1 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 0.532 in (13.5 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 0.850 in (21.6 mm) | G83 full retract | 0.5-1 × D, shrinking with depth | Retract to clear chips; reduce feed ~10-20% past 5×D. |
Taps that use a 2.7 mm drill
- M3×0.5 — cut tap, 50% thread · tap speeds and feeds
Nearest drills
- #36: 0.1065 in / 2.705 mm (+0.0002 in)
- 2.65 mm: 0.1043 in / 2.650 mm (-0.0020 in)
- 2.75 mm: 0.1083 in / 2.750 mm (+0.0020 in)
- #37: 0.1040 in / 2.642 mm (-0.0023 in)
Common questions
- What is a 2.7 mm drill in decimal and mm?
- 0.1063 in, or 2.700 mm; nearest fractional drill: 7/64" (0.1094 in, +0.0031 in); nearest number / letter drill: #36 (0.1065 in, +0.0002 in).
- What RPM for a 2.7 mm drill in steel?
- In low-carbon steel (1018) an HSS 2.7 mm drill (0.1063 in) runs about 3,230 RPM at 90 SFM; a carbide drill about 10,780 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a 2.7 mm drill?
- About 0.0025 in/rev in mild steel, 0.0024 in/rev in aluminum and 0.0017 in/rev in 304 stainless. At 3,230 RPM that is 8.07 IPM in steel (IPM = RPM × IPR).
- What RPM for a 2.7 mm drill in aluminum?
- 8,980 RPM with HSS (250 SFM) or up to 21,560 RPM with carbide (600 SFM), feeding about 0.0024 in/rev.
- What tap uses a 2.7 mm drill?
- M3×0.5 (cut tap, 50% thread).
Nearby drill sizes
Sources
- Machinery's Handbook, 31st ed., Speeds and Feeds for Drilling, Reaming and Threading (Tables 17-23) — HSS and carbide drilling SFM (rounded).
- RedLine Tools (Productivity Inc.) catalog p. 340, Cobalt & HSS Drills Speeds & Feeds — feed per rev by drill diameter and material (middle of the catalog range).
- ASME B94.11M twist drills: number (#1-#80) and letter (A-Z) drill sizes; drill size reference.
Material feed multipliers (aluminum 1.3×, brass 1.1×, 4140 0.85×, stainless and titanium 0.7× the mild-steel feed) are JobLine estimates. Peck guidance is JobLine shop practice. Use your drill maker's data first.
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