What is a 7/64" drill in decimal and mm?

0.1094 in, or 2.778 mm; nearest number / letter drill: #35 (0.1100 in, +0.0006 in); nearest metric drill: 2.8 mm (0.1102 in, +0.0009 in).

What RPM for a 7/64" drill in steel?

In low-carbon steel (1018) an HSS 7/64" drill (0.1094 in) runs about 3,140 RPM at 90 SFM; a carbide drill about 10,480 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 7/64" drill?

About 0.0026 in/rev in mild steel, 0.0025 in/rev in aluminum and 0.0018 in/rev in 304 stainless. At 3,140 RPM that is 8.16 IPM in steel (IPM = RPM × IPR).

What RPM for a 7/64" drill in aluminum?

8,730 RPM with HSS (250 SFM) or up to 20,950 RPM with carbide (600 SFM), feeding about 0.0025 in/rev.

7/64" drill size

A 7/64" fractional drill is 0.1094 in (2.778 mm). It is the cut tap, 50% thread drill for 5-40.

Decimal inch: 0.1094
Millimeters: 2.778
Nearest 1/64: 7/64" (+0.0000)
Type: fractional drill

Nearest equivalents in other systems

Drills closest to 7/64"
System	Drill	Inch	mm	Difference
Number / letter	#35	0.1100	2.794	+0.0006 in
Metric	2.8 mm	0.1102	2.800	+0.0009 in

Speeds and feeds: in mild steel an HSS drill starts at about 3,140 RPM and 0.0026 in/rev (8.16 IPM); in 6061 aluminum about 8,730 RPM.

7/64" drill speeds and feeds by material

Jobber-length twist drill, D = 0.1094 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

7/64" drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	8,730	600	20,950	0.0025	21.8	52.4
Brass / free-machining	150	5,240	400	13,970	0.0021	11.0	29.3
Low-carbon steel (1018)	90	3,140	300	10,480	0.0026	8.16	27.3
Alloy steel (4140, annealed)	70	2,440	250	8,730	0.0026	6.34	22.7
Stainless 304	40	1,400	150	5,240	0.0018	2.52	9.43
Gray cast iron	80	2,790	250	8,730	0.0016	4.46	14.0
Titanium 6Al-4V	25	870	100	3,490	0.0014	1.22	4.89
Plastics (acetal)	300	10,480	500	17,460	0.0044	46.1	76.8

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, 3,140 RPM × 0.066 mm/rev = 207 mm/min.

Worked example: 7/64" drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.1094 ≈ 3,140 RPM.
Feed for a 0.109 in drill in mild steel ≈ 0.0026 in/rev.
IPM = 3,140 × 0.0026 = 8.16 IPM.

Peck cycle by hole depth

7/64" drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 0.328 in (8.3 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 0.547 in (13.9 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 0.875 in (22.2 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 7/64" drill

5-40 — cut tap, 50% thread · tap speeds and feeds

Nearest drills

#35: 0.1100 in / 2.794 mm (+0.0006 in)
2.8 mm: 0.1102 in / 2.800 mm (+0.0009 in)
2.75 mm: 0.1083 in / 2.750 mm (-0.0011 in)
#34: 0.1110 in / 2.819 mm (+0.0016 in)

Drill speed calculator, prefilled for 7/64"Drill finder: sizes near 7/64"Fractional drill chart Decimal equivalent chart

Common questions

What is a 7/64" drill in decimal and mm?: 0.1094 in, or 2.778 mm; nearest number / letter drill: #35 (0.1100 in, +0.0006 in); nearest metric drill: 2.8 mm (0.1102 in, +0.0009 in).
What RPM for a 7/64" drill in steel?: In low-carbon steel (1018) an HSS 7/64" drill (0.1094 in) runs about 3,140 RPM at 90 SFM; a carbide drill about 10,480 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 7/64" drill?: About 0.0026 in/rev in mild steel, 0.0025 in/rev in aluminum and 0.0018 in/rev in 304 stainless. At 3,140 RPM that is 8.16 IPM in steel (IPM = RPM × IPR).
What RPM for a 7/64" drill in aluminum?: 8,730 RPM with HSS (250 SFM) or up to 20,950 RPM with carbide (600 SFM), feeding about 0.0025 in/rev.
What tap uses a 7/64" drill?: 5-40 (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.

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