11.2 mm drill size
A 11.2 mm metric drill is 0.4409 in (11.200 mm). It is the cut tap, 50% thread drill for M12x1.25.
- Decimal inch
- 0.4409
- Millimeters
- 11.200
- Nearest 1/64
- 7/16" (+0.0034)
- Type
- metric drill
Nearest equivalents in other systems
Speeds and feeds: in mild steel an HSS drill starts at about 780 RPM and 0.0100 in/rev (7.80 IPM); in 6061 aluminum about 2,170 RPM.
11.2 mm drill speeds and feeds by material
Jobber-length twist drill, D = 0.4409 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 | 2,170 | 600 | 5,200 | 0.0093 | 20.2 | 48.4 |
| Brass / free-machining | 150 | 1,300 | 400 | 3,470 | 0.0073 | 9.49 | 25.3 |
| Low-carbon steel (1018) | 90 | 780 | 300 | 2,600 | 0.0100 | 7.80 | 26.0 |
| Alloy steel (4140, annealed) | 70 | 610 | 250 | 2,170 | 0.0110 | 6.71 | 23.9 |
| Stainless 304 | 40 | 350 | 150 | 1,300 | 0.0074 | 2.59 | 9.62 |
| Gray cast iron | 80 | 690 | 250 | 2,170 | 0.0076 | 5.24 | 16.5 |
| Titanium 6Al-4V | 25 | 220 | 100 | 870 | 0.0046 | 1.01 | 4.00 |
| Plastics (acetal) | 300 | 2,600 | 500 | 4,330 | 0.0055 | 14.3 | 23.8 |
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 780 RPM × 0.254 mm/rev = 198 mm/min.
Worked example: 11.2 mm drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.4409 ≈ 780 RPM.
- Feed for a 0.441 in drill in mild steel ≈ 0.0100 in/rev.
- IPM = 780 × 0.0100 = 7.80 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 1.323 in (33.6 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 2.205 in (56 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 3.528 in (89.6 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 11.2 mm drill
- M12x1.25 — cut tap, 50% thread
Nearest drills
- 7/16": 0.4375 in / 11.112 mm (-0.0034 in)
- 11.1 mm: 0.4370 in / 11.100 mm (-0.0039 in)
- 11.3 mm: 0.4449 in / 11.300 mm (+0.0039 in)
- 11.0 mm: 0.4331 in / 11.000 mm (-0.0079 in)
Common questions
- What is a 11.2 mm drill in decimal and mm?
- 0.4409 in, or 11.200 mm; nearest fractional drill: 7/16" (0.4375 in, -0.0034 in); nearest number / letter drill: Letter Z (0.4130 in, -0.0279 in).
- What RPM for a 11.2 mm drill in steel?
- In low-carbon steel (1018) an HSS 11.2 mm drill (0.4409 in) runs about 780 RPM at 90 SFM; a carbide drill about 2,600 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a 11.2 mm drill?
- About 0.0100 in/rev in mild steel, 0.0093 in/rev in aluminum and 0.0074 in/rev in 304 stainless. At 780 RPM that is 7.80 IPM in steel (IPM = RPM × IPR).
- What RPM for a 11.2 mm drill in aluminum?
- 2,170 RPM with HSS (250 SFM) or up to 5,200 RPM with carbide (600 SFM), feeding about 0.0093 in/rev.
- What tap uses a 11.2 mm drill?
- M12x1.25 (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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