6.0 mm drill size
A 6.0 mm metric drill is 0.2362 in (6.000 mm). It is the cut tap, 75% thread drill for M7x1.
- Decimal inch
- 0.2362
- Millimeters
- 6.000
- Nearest 1/64
- 15/64" (+0.0018)
- Type
- metric drill
Nearest equivalents in other systems
Speeds and feeds: in mild steel an HSS drill starts at about 1,460 RPM and 0.0061 in/rev (8.91 IPM); in 6061 aluminum about 4,040 RPM.
6.0 mm drill speeds and feeds by material
Jobber-length twist drill, D = 0.2362 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 | 4,040 | 600 | 9,700 | 0.0057 | 23.0 | 55.3 |
| Brass / free-machining | 150 | 2,430 | 400 | 6,470 | 0.0049 | 11.9 | 31.7 |
| Low-carbon steel (1018) | 90 | 1,460 | 300 | 4,850 | 0.0061 | 8.91 | 29.6 |
| Alloy steel (4140, annealed) | 70 | 1,130 | 250 | 4,040 | 0.0061 | 6.89 | 24.6 |
| Stainless 304 | 40 | 650 | 150 | 2,430 | 0.0040 | 2.60 | 9.72 |
| Gray cast iron | 80 | 1,290 | 250 | 4,040 | 0.0042 | 5.42 | 17.0 |
| Titanium 6Al-4V | 25 | 400 | 100 | 1,620 | 0.0028 | 1.12 | 4.54 |
| Plastics (acetal) | 300 | 4,850 | 500 | 8,090 | 0.0041 | 19.9 | 33.2 |
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 1,460 RPM × 0.155 mm/rev = 226 mm/min.
Worked example: 6.0 mm drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.2362 ≈ 1,460 RPM.
- Feed for a 0.236 in drill in mild steel ≈ 0.0061 in/rev.
- IPM = 1,460 × 0.0061 = 8.91 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 0.709 in (18 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 1.181 in (30 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 1.890 in (48 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 6.0 mm drill
- M7x1 — cut tap, 75% thread · tap speeds and feeds
Nearest drills
- Letter B: 0.2380 in / 6.045 mm (+0.0018 in)
- 15/64": 0.2344 in / 5.953 mm (-0.0019 in)
- Letter A: 0.2340 in / 5.944 mm (-0.0022 in)
- 5.9 mm: 0.2323 in / 5.900 mm (-0.0039 in)
Common questions
- What is a 6.0 mm drill in decimal and mm?
- 0.2362 in, or 6.000 mm; nearest fractional drill: 15/64" (0.2344 in, -0.0019 in); nearest number / letter drill: Letter B (0.2380 in, +0.0018 in).
- What RPM for a 6.0 mm drill in steel?
- In low-carbon steel (1018) an HSS 6.0 mm drill (0.2362 in) runs about 1,460 RPM at 90 SFM; a carbide drill about 4,850 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a 6.0 mm drill?
- About 0.0061 in/rev in mild steel, 0.0057 in/rev in aluminum and 0.0040 in/rev in 304 stainless. At 1,460 RPM that is 8.91 IPM in steel (IPM = RPM × IPR).
- What RPM for a 6.0 mm drill in aluminum?
- 4,040 RPM with HSS (250 SFM) or up to 9,700 RPM with carbide (600 SFM), feeding about 0.0057 in/rev.
- What tap uses a 6.0 mm drill?
- M7x1 (cut tap, 75% 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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