What is a 11/64" drill in decimal and mm?

0.1719 in, or 4.366 mm; nearest number / letter drill: #17 (0.1730 in, +0.0011 in); nearest metric drill: 4.4 mm (0.1732 in, +0.0014 in).

What RPM for a 11/64" drill in steel?

In low-carbon steel (1018) an HSS 11/64" drill (0.1719 in) runs about 2,000 RPM at 90 SFM; a carbide drill about 6,670 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 11/64" drill?

About 0.0043 in/rev in mild steel, 0.0040 in/rev in aluminum and 0.0028 in/rev in 304 stainless. At 2,000 RPM that is 8.60 IPM in steel (IPM = RPM × IPR).

What RPM for a 11/64" drill in aluminum?

5,560 RPM with HSS (250 SFM) or up to 13,330 RPM with carbide (600 SFM), feeding about 0.0040 in/rev.

What tap uses a 11/64" drill?

10-24 (form (roll) tap, 65% thread).

11/64" drill size

A 11/64" fractional drill is 0.1719 in (4.366 mm). It is the form (roll) tap, 65% thread drill for 10-24.

Decimal inch: 0.1719
Millimeters: 4.366
Nearest 1/64: 11/64" (+0.0000)
Type: fractional drill

Nearest equivalents in other systems

Drills closest to 11/64"
System	Drill	Inch	mm	Difference
Number / letter	#17	0.1730	4.394	+0.0011 in
Metric	4.4 mm	0.1732	4.400	+0.0014 in

Speeds and feeds: in mild steel an HSS drill starts at about 2,000 RPM and 0.0043 in/rev (8.60 IPM); in 6061 aluminum about 5,560 RPM.

11/64" drill speeds and feeds by material

Jobber-length twist drill, D = 0.1719 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

11/64" drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	5,560	600	13,330	0.0040	22.2	53.3
Brass / free-machining	150	3,330	400	8,890	0.0035	11.7	31.1
Low-carbon steel (1018)	90	2,000	300	6,670	0.0043	8.60	28.7
Alloy steel (4140, annealed)	70	1,560	250	5,560	0.0043	6.71	23.9
Stainless 304	40	890	150	3,330	0.0028	2.49	9.32
Gray cast iron	80	1,780	250	5,560	0.0028	4.98	15.6
Titanium 6Al-4V	25	560	100	2,220	0.0021	1.18	4.66
Plastics (acetal)	300	6,670	500	11,110	0.0046	30.7	51.1

Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 2,000 RPM × 0.109 mm/rev = 218 mm/min.

Worked example: 11/64" drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.1719 ≈ 2,000 RPM.
Feed for a 0.172 in drill in mild steel ≈ 0.0043 in/rev.
IPM = 2,000 × 0.0043 = 8.60 IPM.

Peck cycle by hole depth

11/64" drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 0.516 in (13.1 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 0.859 in (21.8 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 1.375 in (34.9 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 11/64" drill

10-24 — form (roll) tap, 65% thread · tap speeds and feeds

Nearest drills

#17: 0.1730 in / 4.394 mm (+0.0011 in)
4.4 mm: 0.1732 in / 4.400 mm (+0.0014 in)
#18: 0.1695 in / 4.305 mm (-0.0024 in)
4.3 mm: 0.1693 in / 4.300 mm (-0.0026 in)

Drill speed calculator, prefilled for 11/64"Drill finder: sizes near 11/64"Fractional drill chart Decimal equivalent chart

Common questions

What is a 11/64" drill in decimal and mm?: 0.1719 in, or 4.366 mm; nearest number / letter drill: #17 (0.1730 in, +0.0011 in); nearest metric drill: 4.4 mm (0.1732 in, +0.0014 in).
What RPM for a 11/64" drill in steel?: In low-carbon steel (1018) an HSS 11/64" drill (0.1719 in) runs about 2,000 RPM at 90 SFM; a carbide drill about 6,670 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 11/64" drill?: About 0.0043 in/rev in mild steel, 0.0040 in/rev in aluminum and 0.0028 in/rev in 304 stainless. At 2,000 RPM that is 8.60 IPM in steel (IPM = RPM × IPR).
What RPM for a 11/64" drill in aluminum?: 5,560 RPM with HSS (250 SFM) or up to 13,330 RPM with carbide (600 SFM), feeding about 0.0040 in/rev.
What tap uses a 11/64" drill?: 10-24 (form (roll) tap, 65% 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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