9.6 mm drill size
A 9.6 mm metric drill is 0.3780 in (9.600 mm). It is the form (roll) tap, 65% thread drill for M10x1.
- Decimal inch
- 0.3780
- Millimeters
- 9.600
- Nearest 1/64
- 3/8" (+0.0030)
- Type
- metric drill
Nearest equivalents in other systems
Speeds and feeds: in mild steel an HSS drill starts at about 910 RPM and 0.0095 in/rev (8.65 IPM); in 6061 aluminum about 2,530 RPM.
9.6 mm drill speeds and feeds by material
Jobber-length twist drill, D = 0.3780 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 | 2,530 | 600 | 6,060 | 0.0085 | 21.5 | 51.5 |
| Brass / free-machining | 150 | 1,520 | 400 | 4,040 | 0.0063 | 9.58 | 25.4 |
| Low-carbon steel (1018) | 90 | 910 | 300 | 3,030 | 0.0095 | 8.65 | 28.8 |
| Alloy steel (4140, annealed) | 70 | 710 | 250 | 2,530 | 0.0105 | 7.46 | 26.6 |
| Stainless 304 | 40 | 400 | 150 | 1,520 | 0.0063 | 2.52 | 9.58 |
| Gray cast iron | 80 | 810 | 250 | 2,530 | 0.0065 | 5.27 | 16.4 |
| Titanium 6Al-4V | 25 | 250 | 100 | 1,010 | 0.0043 | 1.08 | 4.34 |
| Plastics (acetal) | 300 | 3,030 | 500 | 5,050 | 0.0050 | 15.2 | 25.3 |
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 910 RPM × 0.241 mm/rev = 220 mm/min.
Worked example: 9.6 mm drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.3780 ≈ 910 RPM.
- Feed for a 0.378 in drill in mild steel ≈ 0.0095 in/rev.
- IPM = 910 × 0.0095 = 8.65 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 1.134 in (28.8 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 1.890 in (48 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 3.024 in (76.8 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 9.6 mm drill
- M10x1 — form (roll) tap, 65% thread
Nearest drills
- Letter V: 0.3770 in / 9.576 mm (-0.0009 in)
- 3/8": 0.3750 in / 9.525 mm (-0.0029 in)
- 9.5 mm: 0.3740 in / 9.500 mm (-0.0039 in)
- 9.7 mm: 0.3819 in / 9.700 mm (+0.0039 in)
Common questions
- What is a 9.6 mm drill in decimal and mm?
- 0.3780 in, or 9.600 mm; nearest fractional drill: 3/8" (0.3750 in, -0.0029 in); nearest number / letter drill: Letter V (0.3770 in, -0.0009 in).
- What RPM for a 9.6 mm drill in steel?
- In low-carbon steel (1018) an HSS 9.6 mm drill (0.3780 in) runs about 910 RPM at 90 SFM; a carbide drill about 3,030 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a 9.6 mm drill?
- About 0.0095 in/rev in mild steel, 0.0085 in/rev in aluminum and 0.0063 in/rev in 304 stainless. At 910 RPM that is 8.65 IPM in steel (IPM = RPM × IPR).
- What RPM for a 9.6 mm drill in aluminum?
- 2,530 RPM with HSS (250 SFM) or up to 6,060 RPM with carbide (600 SFM), feeding about 0.0085 in/rev.
- What tap uses a 9.6 mm drill?
- M10x1 (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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