16.0 mm drill size
A 16.0 mm metric drill is 0.6299 in (16.000 mm).
- Decimal inch
- 0.6299
- Millimeters
- 16.000
- Nearest 1/64
- 5/8" (+0.0049)
- Type
- metric drill
Nearest equivalents in other systems
Speeds and feeds: in mild steel an HSS drill starts at about 550 RPM and 0.0110 in/rev (6.05 IPM); in 6061 aluminum about 1,520 RPM.
16.0 mm drill speeds and feeds by material
Jobber-length twist drill, D = 0.6299 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 | 1,520 | 600 | 3,640 | 0.0105 | 16.0 | 38.2 |
| Brass / free-machining | 150 | 910 | 400 | 2,430 | 0.0086 | 7.83 | 20.9 |
| Low-carbon steel (1018) | 90 | 550 | 300 | 1,820 | 0.0110 | 6.05 | 20.0 |
| Alloy steel (4140, annealed) | 70 | 420 | 250 | 1,520 | 0.0118 | 4.96 | 17.9 |
| Stainless 304 | 40 | 240 | 150 | 910 | 0.0090 | 2.16 | 8.19 |
| Gray cast iron | 80 | 490 | 250 | 1,520 | 0.0093 | 4.56 | 14.1 |
| Titanium 6Al-4V | 25 | 150 | 100 | 610 | 0.0053 | 0.80 | 3.23 |
| Plastics (acetal) | 300 | 1,820 | 500 | 3,030 | 0.0065 | 11.8 | 19.7 |
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 550 RPM × 0.279 mm/rev = 154 mm/min.
Worked example: 16.0 mm drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.6299 ≈ 550 RPM.
- Feed for a 0.630 in drill in mild steel ≈ 0.0110 in/rev.
- IPM = 550 × 0.0110 = 6.05 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 1.890 in (48 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 3.150 in (80 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 5.039 in (128 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 16.0 mm drill
No standard UNC, UNF or metric tap in our tables calls for a 16.0 mm drill. Use it for clearance, pilot or reamer prep holes.
Nearest drills
- 5/8": 0.6250 in / 15.875 mm (-0.0049 in)
- 15.75 mm: 0.6201 in / 15.750 mm (-0.0098 in)
- 16.25 mm: 0.6398 in / 16.250 mm (+0.0098 in)
- 41/64": 0.6406 in / 16.272 mm (+0.0107 in)
Common questions
- What is a 16.0 mm drill in decimal and mm?
- 0.6299 in, or 16.000 mm; nearest fractional drill: 5/8" (0.6250 in, -0.0049 in); nearest number / letter drill: Letter Z (0.4130 in, -0.2169 in).
- What RPM for a 16.0 mm drill in steel?
- In low-carbon steel (1018) an HSS 16.0 mm drill (0.6299 in) runs about 550 RPM at 90 SFM; a carbide drill about 1,820 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a 16.0 mm drill?
- About 0.0110 in/rev in mild steel, 0.0105 in/rev in aluminum and 0.0090 in/rev in 304 stainless. At 550 RPM that is 6.05 IPM in steel (IPM = RPM × IPR).
- What RPM for a 16.0 mm drill in aluminum?
- 1,520 RPM with HSS (250 SFM) or up to 3,640 RPM with carbide (600 SFM), feeding about 0.0105 in/rev.
- What size is a 16.0 mm drill?
- 0.6299 in / 16.00 mm. The nearest other drills are 5/8" (0.6250 in), 15.75 mm (0.6201 in), 16.25 mm (0.6398 in).
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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