5.4 mm drill size
A 5.4 mm metric drill is 0.2126 in (5.400 mm). It is the cut tap, 50% thread drill for M6×1.0.
- Decimal inch
- 0.2126
- Millimeters
- 5.400
- Nearest 1/64
- 7/32" (-0.0061)
- Type
- metric drill
Nearest equivalents in other systems
Speeds and feeds: in mild steel an HSS drill starts at about 1,620 RPM and 0.0054 in/rev (8.75 IPM); in 6061 aluminum about 4,490 RPM.
5.4 mm drill speeds and feeds by material
Jobber-length twist drill, D = 0.2126 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 | 4,490 | 600 | 10,780 | 0.0051 | 22.9 | 55.0 |
| Brass / free-machining | 150 | 2,700 | 400 | 7,190 | 0.0044 | 11.9 | 31.6 |
| Low-carbon steel (1018) | 90 | 1,620 | 300 | 5,390 | 0.0054 | 8.75 | 29.1 |
| Alloy steel (4140, annealed) | 70 | 1,260 | 250 | 4,490 | 0.0054 | 6.80 | 24.3 |
| Stainless 304 | 40 | 720 | 150 | 2,700 | 0.0036 | 2.59 | 9.72 |
| Gray cast iron | 80 | 1,440 | 250 | 4,490 | 0.0037 | 5.33 | 16.6 |
| Titanium 6Al-4V | 25 | 450 | 100 | 1,800 | 0.0026 | 1.17 | 4.68 |
| Plastics (acetal) | 300 | 5,390 | 500 | 8,980 | 0.0043 | 23.2 | 38.6 |
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 1,620 RPM × 0.137 mm/rev = 222 mm/min.
Worked example: 5.4 mm drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.2126 ≈ 1,620 RPM.
- Feed for a 0.213 in drill in mild steel ≈ 0.0054 in/rev.
- IPM = 1,620 × 0.0054 = 8.75 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 0.638 in (16.2 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 1.063 in (27 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 1.701 in (43.2 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 5.4 mm drill
- M6×1.0 — cut tap, 50% thread · tap speeds and feeds
Nearest drills
- #3: 0.2130 in / 5.410 mm (+0.0004 in)
- #4: 0.2090 in / 5.309 mm (-0.0036 in)
- 5.3 mm: 0.2087 in / 5.300 mm (-0.0039 in)
- 5.5 mm: 0.2165 in / 5.500 mm (+0.0039 in)
Common questions
- What is a 5.4 mm drill in decimal and mm?
- 0.2126 in, or 5.400 mm; nearest fractional drill: 7/32" (0.2188 in, +0.0062 in); nearest number / letter drill: #3 (0.2130 in, +0.0004 in).
- What RPM for a 5.4 mm drill in steel?
- In low-carbon steel (1018) an HSS 5.4 mm drill (0.2126 in) runs about 1,620 RPM at 90 SFM; a carbide drill about 5,390 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a 5.4 mm drill?
- About 0.0054 in/rev in mild steel, 0.0051 in/rev in aluminum and 0.0036 in/rev in 304 stainless. At 1,620 RPM that is 8.75 IPM in steel (IPM = RPM × IPR).
- What RPM for a 5.4 mm drill in aluminum?
- 4,490 RPM with HSS (250 SFM) or up to 10,780 RPM with carbide (600 SFM), feeding about 0.0051 in/rev.
- What tap uses a 5.4 mm drill?
- M6×1.0 (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.
Put your skills on a free talent profile
Machines, controls, certs and saved calculations in one profile shops can find.
Create free profileBring shift handoffs to your shop
Stop losing job status between shifts. Every station's notes, counts and issues, handed off cleanly.
See shift handoffs