#82 drill size
A #82 number (wire-gauge) drill is 0.0125 in (0.318 mm).
- Decimal inch
- 0.0125
- Millimeters
- 0.318
- Nearest 1/64
- 1/64" (-0.0031)
- Type
- number (wire-gauge) drill
Nearest equivalents in other systems
| System | Drill | Inch | mm | Difference |
|---|---|---|---|---|
| Fractional | 1/64" | 0.0156 | 0.397 | +0.0031 in |
| Metric | 0.3 mm | 0.0118 | 0.300 | -0.0007 in |
Speeds and feeds: in mild steel an HSS drill starts at about 27,500 RPM and 0.0007 in/rev (19.3 IPM); in 6061 aluminum about 76,390 RPM.
#82 drill speeds and feeds by material
Jobber-length twist drill, D = 0.0125 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 | 76,390 | 600 | 183,350 | 0.0007 | 53.5 | 128.3 |
| Brass / free-machining | 150 | 45,840 | 400 | 122,230 | 0.0006 | 27.5 | 73.3 |
| Low-carbon steel (1018) | 90 | 27,500 | 300 | 91,670 | 0.0007 | 19.3 | 64.2 |
| Alloy steel (4140, annealed) | 70 | 21,390 | 250 | 76,390 | 0.0007 | 15.0 | 53.5 |
| Stainless 304 | 40 | 12,220 | 150 | 45,840 | 0.0005 | 6.11 | 22.9 |
| Gray cast iron | 80 | 24,450 | 250 | 76,390 | 0.0005 | 12.2 | 38.2 |
| Titanium 6Al-4V | 25 | 7,640 | 100 | 30,560 | 0.0004 | 3.06 | 12.2 |
| Plastics (acetal) | 300 | 91,670 | 500 | 152,790 | 0.0013 | 119.2 | 198.6 |
Small drills: the computed RPM is above most spindles. Run at your spindle's maximum and keep the feed per rev; feed drops in proportion.
Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 27,500 RPM × 0.018 mm/rev = 489 mm/min.
Worked example: #82 drill in 1018 steel
- HSS drill in low-carbon steel: 90 SFM.
- RPM = 3.82 × 90 ÷ 0.0125 ≈ 27,500 RPM.
- Feed for a 0.013 in drill in mild steel ≈ 0.0007 in/rev.
- IPM = 27,500 × 0.0007 = 19.3 IPM.
Peck cycle by hole depth
| Depth | Cycle | Peck | Note |
|---|---|---|---|
| 3×D = 0.038 in (1 mm) | G81 (no peck) | None | Up to 3×D a sharp drill clears chips on its own. |
| 5×D = 0.063 in (1.6 mm) | G73 chip-break | 1 × D | Chip-break pecks; full retract if chips pack (soft aluminum, stainless). |
| 8×D = 0.100 in (2.5 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 #82 drill
No standard UNC, UNF or metric tap in our tables calls for a #82 drill. Use it for clearance, pilot or reamer prep holes.
Nearest drills
- #83: 0.0120 in / 0.305 mm (-0.0005 in)
- #81: 0.0130 in / 0.330 mm (+0.0005 in)
- 0.3 mm: 0.0118 in / 0.300 mm (-0.0007 in)
- #84: 0.0115 in / 0.292 mm (-0.0010 in)
Common questions
- What is a #82 drill in decimal and mm?
- 0.0125 in, or 0.318 mm; nearest fractional drill: 1/64" (0.0156 in, +0.0031 in); nearest metric drill: 0.3 mm (0.0118 in, -0.0007 in).
- What RPM for a #82 drill in steel?
- In low-carbon steel (1018) an HSS #82 drill (0.0125 in) runs about 27,500 RPM at 90 SFM; a carbide drill about 91,670 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
- What feed for a #82 drill?
- About 0.0007 in/rev in mild steel, 0.0007 in/rev in aluminum and 0.0005 in/rev in 304 stainless. At 27,500 RPM that is 19.3 IPM in steel (IPM = RPM × IPR).
- What RPM for a #82 drill in aluminum?
- 76,390 RPM with HSS (250 SFM) or up to 183,350 RPM with carbide (600 SFM), feeding about 0.0007 in/rev.
- What size is a #82 drill?
- 0.0125 in / 0.318 mm. The nearest other drills are #83 (0.0120 in), #81 (0.0130 in), 0.3 mm (0.0118 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.
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