14.5 mm drill size
A 14.5 mm metric drill is 0.5709 in (14.500 mm). It is the cut tap, 75% thread drill for M16x1.5.
- Decimal inch
- 0.5709
- Millimeters
- 14.500
- Nearest 1/64
- 37/64" (-0.0073)
- Type
- metric drill
Nearest equivalents in other systems
Speeds and feeds: in mild steel an HSS drill starts at about 600 RPM and 0.0108 in/rev (6.48 IPM); in 6061 aluminum about 1,670 RPM.
14.5 mm drill speeds and feeds by material
Jobber-length twist drill, D = 0.5709 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 | 1,670 | 600 | 4,010 | 0.0103 | 17.2 | 41.3 |
| Brass / free-machining | 150 | 1,000 | 400 | 2,680 | 0.0085 | 8.50 | 22.8 |
| Low-carbon steel (1018) | 90 | 600 | 300 | 2,010 | 0.0108 | 6.48 | 21.7 |
| Alloy steel (4140, annealed) | 70 | 470 | 250 | 1,670 | 0.0116 | 5.45 | 19.4 |
| Stainless 304 | 40 | 270 | 150 | 1,000 | 0.0088 | 2.38 | 8.80 |
| Gray cast iron | 80 | 540 | 250 | 1,670 | 0.0089 | 4.81 | 14.9 |
| Titanium 6Al-4V | 25 | 170 | 100 | 670 | 0.0051 | 0.87 | 3.42 |
| Plastics (acetal) | 300 | 2,010 | 500 | 3,350 | 0.0063 | 12.7 | 21.1 |
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 600 RPM × 0.274 mm/rev = 165 mm/min.
Worked example: 14.5 mm drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.5709 ≈ 600 RPM.
- Feed for a 0.571 in drill in mild steel ≈ 0.0108 in/rev.
- IPM = 600 × 0.0108 = 6.48 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 1.713 in (43.5 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 2.854 in (72.5 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 4.567 in (116 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 14.5 mm drill
- M16x1.5 — cut tap, 75% thread
Nearest drills
- 37/64": 0.5781 in / 14.684 mm (+0.0073 in)
- 9/16": 0.5625 in / 14.288 mm (-0.0084 in)
- 14.75 mm: 0.5807 in / 14.750 mm (+0.0098 in)
- 14.25 mm: 0.5610 in / 14.250 mm (-0.0098 in)
Common questions
- What is a 14.5 mm drill in decimal and mm?
- 0.5709 in, or 14.500 mm; nearest fractional drill: 37/64" (0.5781 in, +0.0073 in); nearest number / letter drill: Letter Z (0.4130 in, -0.1579 in).
- What RPM for a 14.5 mm drill in steel?
- In low-carbon steel (1018) an HSS 14.5 mm drill (0.5709 in) runs about 600 RPM at 90 SFM; a carbide drill about 2,010 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a 14.5 mm drill?
- About 0.0108 in/rev in mild steel, 0.0103 in/rev in aluminum and 0.0088 in/rev in 304 stainless. At 600 RPM that is 6.48 IPM in steel (IPM = RPM × IPR).
- What RPM for a 14.5 mm drill in aluminum?
- 1,670 RPM with HSS (250 SFM) or up to 4,010 RPM with carbide (600 SFM), feeding about 0.0103 in/rev.
- What tap uses a 14.5 mm drill?
- M16x1.5 (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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