7.6 mm drill size
A 7.6 mm metric drill is 0.2992 in (7.600 mm). It is the form (roll) tap, 65% thread drill for M8x1.
- Decimal inch
- 0.2992
- Millimeters
- 7.600
- Nearest 1/64
- 19/64" (+0.0023)
- Type
- metric drill
Nearest equivalents in other systems
Speeds and feeds: in mild steel an HSS drill starts at about 1,150 RPM and 0.0077 in/rev (8.86 IPM); in 6061 aluminum about 3,190 RPM.
7.6 mm drill speeds and feeds by material
Jobber-length twist drill, D = 0.2992 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 | 3,190 | 600 | 7,660 | 0.0070 | 22.3 | 53.6 |
| Brass / free-machining | 150 | 1,910 | 400 | 5,110 | 0.0056 | 10.7 | 28.6 |
| Low-carbon steel (1018) | 90 | 1,150 | 300 | 3,830 | 0.0077 | 8.86 | 29.5 |
| Alloy steel (4140, annealed) | 70 | 890 | 250 | 3,190 | 0.0081 | 7.21 | 25.8 |
| Stainless 304 | 40 | 510 | 150 | 1,910 | 0.0050 | 2.55 | 9.55 |
| Gray cast iron | 80 | 1,020 | 250 | 3,190 | 0.0053 | 5.41 | 16.9 |
| Titanium 6Al-4V | 25 | 320 | 100 | 1,280 | 0.0035 | 1.12 | 4.48 |
| Plastics (acetal) | 300 | 3,830 | 500 | 6,380 | 0.0044 | 16.9 | 28.1 |
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 1,150 RPM × 0.196 mm/rev = 225 mm/min.
Worked example: 7.6 mm drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.2992 ≈ 1,150 RPM.
- Feed for a 0.299 in drill in mild steel ≈ 0.0077 in/rev.
- IPM = 1,150 × 0.0077 = 8.86 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 0.898 in (22.8 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 1.496 in (38 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 2.394 in (60.8 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 7.6 mm drill
- M8x1 — form (roll) tap, 65% thread
Nearest drills
- 19/64": 0.2969 in / 7.541 mm (-0.0023 in)
- Letter N: 0.3020 in / 7.671 mm (+0.0028 in)
- 7.5 mm: 0.2953 in / 7.500 mm (-0.0039 in)
- 7.7 mm: 0.3031 in / 7.700 mm (+0.0039 in)
Common questions
- What is a 7.6 mm drill in decimal and mm?
- 0.2992 in, or 7.600 mm; nearest fractional drill: 19/64" (0.2969 in, -0.0023 in); nearest number / letter drill: Letter N (0.3020 in, +0.0028 in).
- What RPM for a 7.6 mm drill in steel?
- In low-carbon steel (1018) an HSS 7.6 mm drill (0.2992 in) runs about 1,150 RPM at 90 SFM; a carbide drill about 3,830 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a 7.6 mm drill?
- About 0.0077 in/rev in mild steel, 0.0070 in/rev in aluminum and 0.0050 in/rev in 304 stainless. At 1,150 RPM that is 8.86 IPM in steel (IPM = RPM × IPR).
- What RPM for a 7.6 mm drill in aluminum?
- 3,190 RPM with HSS (250 SFM) or up to 7,660 RPM with carbide (600 SFM), feeding about 0.0070 in/rev.
- What tap uses a 7.6 mm drill?
- M8x1 (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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