5.7 mm drill size
A 5.7 mm metric drill is 0.2244 in (5.700 mm). It is the form (roll) tap, 65% thread drill for M6x0.75.
- Decimal inch
- 0.2244
- Millimeters
- 5.700
- Nearest 1/64
- 7/32" (+0.0057)
- Type
- metric drill
Nearest equivalents in other systems
Speeds and feeds: in mild steel an HSS drill starts at about 1,530 RPM and 0.0058 in/rev (8.87 IPM); in 6061 aluminum about 4,260 RPM.
5.7 mm drill speeds and feeds by material
Jobber-length twist drill, D = 0.2244 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 | 4,260 | 600 | 10,210 | 0.0054 | 23.0 | 55.1 |
| Brass / free-machining | 150 | 2,550 | 400 | 6,810 | 0.0047 | 12.0 | 32.0 |
| Low-carbon steel (1018) | 90 | 1,530 | 300 | 5,110 | 0.0058 | 8.87 | 29.6 |
| Alloy steel (4140, annealed) | 70 | 1,190 | 250 | 4,260 | 0.0058 | 6.90 | 24.7 |
| Stainless 304 | 40 | 680 | 150 | 2,550 | 0.0038 | 2.58 | 9.69 |
| Gray cast iron | 80 | 1,360 | 250 | 4,260 | 0.0039 | 5.30 | 16.6 |
| Titanium 6Al-4V | 25 | 430 | 100 | 1,700 | 0.0027 | 1.16 | 4.59 |
| Plastics (acetal) | 300 | 5,110 | 500 | 8,510 | 0.0042 | 21.5 | 35.7 |
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 1,530 RPM × 0.147 mm/rev = 225 mm/min.
Worked example: 5.7 mm drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.2244 ≈ 1,530 RPM.
- Feed for a 0.224 in drill in mild steel ≈ 0.0058 in/rev.
- IPM = 1,530 × 0.0058 = 8.87 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 0.673 in (17.1 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 1.122 in (28.5 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 1.795 in (45.6 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 5.7 mm drill
- M6x0.75 — form (roll) tap, 65% thread
Nearest drills
- #2: 0.2210 in / 5.613 mm (-0.0034 in)
- #1: 0.2280 in / 5.791 mm (+0.0036 in)
- 5.6 mm: 0.2205 in / 5.600 mm (-0.0039 in)
- 5.8 mm: 0.2283 in / 5.800 mm (+0.0039 in)
Common questions
- What is a 5.7 mm drill in decimal and mm?
- 0.2244 in, or 5.700 mm; nearest fractional drill: 7/32" (0.2188 in, -0.0057 in); nearest number / letter drill: #2 (0.2210 in, -0.0034 in).
- What RPM for a 5.7 mm drill in steel?
- In low-carbon steel (1018) an HSS 5.7 mm drill (0.2244 in) runs about 1,530 RPM at 90 SFM; a carbide drill about 5,110 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a 5.7 mm drill?
- About 0.0058 in/rev in mild steel, 0.0054 in/rev in aluminum and 0.0038 in/rev in 304 stainless. At 1,530 RPM that is 8.87 IPM in steel (IPM = RPM × IPR).
- What RPM for a 5.7 mm drill in aluminum?
- 4,260 RPM with HSS (250 SFM) or up to 10,210 RPM with carbide (600 SFM), feeding about 0.0054 in/rev.
- What tap uses a 5.7 mm drill?
- M6x0.75 (form (roll) tap, 65% 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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