What is a #34 drill in decimal and mm?

0.1110 in, or 2.819 mm; nearest fractional drill: 7/64" (0.1094 in, -0.0016 in); nearest metric drill: 2.8 mm (0.1102 in, -0.0008 in).

What RPM for a #34 drill in steel?

In low-carbon steel (1018) an HSS #34 drill (0.1110 in) runs about 3,100 RPM at 90 SFM; a carbide drill about 10,320 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a #34 drill?

About 0.0026 in/rev in mild steel, 0.0025 in/rev in aluminum and 0.0018 in/rev in 304 stainless. At 3,100 RPM that is 8.06 IPM in steel (IPM = RPM × IPR).

What RPM for a #34 drill in aluminum?

8,600 RPM with HSS (250 SFM) or up to 20,650 RPM with carbide (600 SFM), feeding about 0.0025 in/rev.

What size is a #34 drill?

0.1110 in / 2.819 mm. The nearest other drills are 2.8 mm (0.1102 in), #35 (0.1100 in), 2.85 mm (0.1122 in).

#34 drill size

A #34 number (wire-gauge) drill is 0.1110 in (2.819 mm).

Decimal inch: 0.1110
Millimeters: 2.819
Nearest 1/64: 7/64" (+0.0016)
Type: number (wire-gauge) drill

Nearest equivalents in other systems

Drills closest to #34
System	Drill	Inch	mm	Difference
Fractional	7/64"	0.1094	2.778	-0.0016 in
Metric	2.8 mm	0.1102	2.800	-0.0008 in

Speeds and feeds: in mild steel an HSS drill starts at about 3,100 RPM and 0.0026 in/rev (8.06 IPM); in 6061 aluminum about 8,600 RPM.

#34 drill speeds and feeds by material

Jobber-length twist drill, D = 0.1110 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

#34 drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	8,600	600	20,650	0.0025	21.5	51.6
Brass / free-machining	150	5,160	400	13,760	0.0021	10.8	28.9
Low-carbon steel (1018)	90	3,100	300	10,320	0.0026	8.06	26.8
Alloy steel (4140, annealed)	70	2,410	250	8,600	0.0026	6.27	22.4
Stainless 304	40	1,380	150	5,160	0.0018	2.48	9.29
Gray cast iron	80	2,750	250	8,600	0.0016	4.40	13.8
Titanium 6Al-4V	25	860	100	3,440	0.0014	1.20	4.82
Plastics (acetal)	300	10,320	500	17,210	0.0044	45.4	75.7

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, 3,100 RPM × 0.066 mm/rev = 205 mm/min.

Worked example: #34 drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.1110 ≈ 3,100 RPM.
Feed for a 0.111 in drill in mild steel ≈ 0.0026 in/rev.
IPM = 3,100 × 0.0026 = 8.06 IPM.

Peck cycle by hole depth

#34 drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 0.333 in (8.5 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 0.555 in (14.1 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 0.888 in (22.6 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 #34 drill

No standard UNC, UNF or metric tap in our tables calls for a #34 drill. Use it for clearance, pilot or reamer prep holes.

Nearest drills

2.8 mm: 0.1102 in / 2.800 mm (-0.0008 in)
#35: 0.1100 in / 2.794 mm (-0.0010 in)
2.85 mm: 0.1122 in / 2.850 mm (+0.0012 in)
7/64": 0.1094 in / 2.778 mm (-0.0016 in)

Drill speed calculator, prefilled for #34 Drill finder: sizes near #34 Number drill chart Decimal equivalent chart

Common questions

What is a #34 drill in decimal and mm?: 0.1110 in, or 2.819 mm; nearest fractional drill: 7/64" (0.1094 in, -0.0016 in); nearest metric drill: 2.8 mm (0.1102 in, -0.0008 in).
What RPM for a #34 drill in steel?: In low-carbon steel (1018) an HSS #34 drill (0.1110 in) runs about 3,100 RPM at 90 SFM; a carbide drill about 10,320 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a #34 drill?: About 0.0026 in/rev in mild steel, 0.0025 in/rev in aluminum and 0.0018 in/rev in 304 stainless. At 3,100 RPM that is 8.06 IPM in steel (IPM = RPM × IPR).
What RPM for a #34 drill in aluminum?: 8,600 RPM with HSS (250 SFM) or up to 20,650 RPM with carbide (600 SFM), feeding about 0.0025 in/rev.
What size is a #34 drill?: 0.1110 in / 2.819 mm. The nearest other drills are 2.8 mm (0.1102 in), #35 (0.1100 in), 2.85 mm (0.1122 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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