What is a 1.5 mm drill in decimal and mm?

0.0591 in, or 1.500 mm; nearest fractional drill: 1/16" (0.0625 in, +0.0034 in); nearest number / letter drill: #53 (0.0595 in, +0.0004 in).

What RPM for a 1.5 mm drill in steel?

In low-carbon steel (1018) an HSS 1.5 mm drill (0.0591 in) runs about 5,820 RPM at 90 SFM; a carbide drill about 19,400 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 1.5 mm drill?

About 0.0014 in/rev in mild steel, 0.0013 in/rev in aluminum and 0.0009 in/rev in 304 stainless. At 5,820 RPM that is 8.15 IPM in steel (IPM = RPM × IPR).

What RPM for a 1.5 mm drill in aluminum?

16,170 RPM with HSS (250 SFM) or up to 38,810 RPM with carbide (600 SFM), feeding about 0.0013 in/rev.

What size is a 1.5 mm drill?

0.0591 in / 1.500 mm. The nearest other drills are #53 (0.0595 in), 1.55 mm (0.0610 in), 1.45 mm (0.0571 in).

1.5 mm drill size

A 1.5 mm metric drill is 0.0591 in (1.500 mm).

Decimal inch: 0.0591
Millimeters: 1.500
Nearest 1/64: 1/16" (-0.0034)
Type: metric drill

Nearest equivalents in other systems

Drills closest to 1.5 mm
System	Drill	Inch	mm	Difference
Fractional	1/16"	0.0625	1.588	+0.0034 in
Number / letter	#53	0.0595	1.511	+0.0004 in

Speeds and feeds: in mild steel an HSS drill starts at about 5,820 RPM and 0.0014 in/rev (8.15 IPM); in 6061 aluminum about 16,170 RPM.

1.5 mm drill speeds and feeds by material

Jobber-length twist drill, D = 0.0591 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

1.5 mm drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	16,170	600	38,810	0.0013	21.0	50.5
Brass / free-machining	150	9,700	400	25,870	0.0011	10.7	28.5
Low-carbon steel (1018)	90	5,820	300	19,400	0.0014	8.15	27.2
Alloy steel (4140, annealed)	70	4,530	250	16,170	0.0014	6.34	22.6
Stainless 304	40	2,590	150	9,700	0.0009	2.33	8.73
Gray cast iron	80	5,170	250	16,170	0.0009	4.65	14.6
Titanium 6Al-4V	25	1,620	100	6,470	0.0007	1.13	4.53
Plastics (acetal)	300	19,400	500	32,340	0.0024	46.6	77.6

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, 5,820 RPM × 0.036 mm/rev = 207 mm/min.

Worked example: 1.5 mm drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.0591 ≈ 5,820 RPM.
Feed for a 0.059 in drill in mild steel ≈ 0.0014 in/rev.
IPM = 5,820 × 0.0014 = 8.15 IPM.

Peck cycle by hole depth

1.5 mm drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 0.177 in (4.5 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 0.295 in (7.5 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 0.472 in (12 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 1.5 mm drill

No standard UNC, UNF or metric tap in our tables calls for a 1.5 mm drill. Use it for clearance, pilot or reamer prep holes.

Nearest drills

#53: 0.0595 in / 1.511 mm (+0.0004 in)
1.55 mm: 0.0610 in / 1.550 mm (+0.0020 in)
1.45 mm: 0.0571 in / 1.450 mm (-0.0020 in)
1/16": 0.0625 in / 1.588 mm (+0.0034 in)

Drill speed calculator, prefilled for 1.5 mm Drill finder: sizes near 1.5 mm Metric drill chart Decimal equivalent chart

Common questions

What is a 1.5 mm drill in decimal and mm?: 0.0591 in, or 1.500 mm; nearest fractional drill: 1/16" (0.0625 in, +0.0034 in); nearest number / letter drill: #53 (0.0595 in, +0.0004 in).
What RPM for a 1.5 mm drill in steel?: In low-carbon steel (1018) an HSS 1.5 mm drill (0.0591 in) runs about 5,820 RPM at 90 SFM; a carbide drill about 19,400 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 1.5 mm drill?: About 0.0014 in/rev in mild steel, 0.0013 in/rev in aluminum and 0.0009 in/rev in 304 stainless. At 5,820 RPM that is 8.15 IPM in steel (IPM = RPM × IPR).
What RPM for a 1.5 mm drill in aluminum?: 16,170 RPM with HSS (250 SFM) or up to 38,810 RPM with carbide (600 SFM), feeding about 0.0013 in/rev.
What size is a 1.5 mm drill?: 0.0591 in / 1.500 mm. The nearest other drills are #53 (0.0595 in), 1.55 mm (0.0610 in), 1.45 mm (0.0571 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.

Free for machinists & programmers

Put your skills on a free talent profile

Machines, controls, certs and saved calculations in one profile shops can find.

Create free profile

For your shop

Bring shift handoffs to your shop

Stop losing job status between shifts. Every station's notes, counts and issues, handed off cleanly.

See shift handoffs