What is a 1.45 mm drill in decimal and mm?

0.0571 in, or 1.450 mm; nearest fractional drill: 1/16" (0.0625 in, +0.0054 in); nearest number / letter drill: #54 (0.0550 in, -0.0021 in).

What RPM for a 1.45 mm drill in steel?

In low-carbon steel (1018) an HSS 1.45 mm drill (0.0571 in) runs about 6,020 RPM at 90 SFM; a carbide drill about 20,070 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 1.45 mm drill?

About 0.0013 in/rev in mild steel, 0.0013 in/rev in aluminum and 0.0009 in/rev in 304 stainless. At 6,020 RPM that is 7.83 IPM in steel (IPM = RPM × IPR).

What RPM for a 1.45 mm drill in aluminum?

16,730 RPM with HSS (250 SFM) or up to 40,140 RPM with carbide (600 SFM), feeding about 0.0013 in/rev.

What tap uses a 1.45 mm drill?

M1.6x0.35 (form (roll) tap, 65% thread).

1.45 mm drill size

A 1.45 mm metric drill is 0.0571 in (1.450 mm). It is the form (roll) tap, 65% thread drill for M1.6x0.35.

Decimal inch: 0.0571
Millimeters: 1.450
Nearest 1/64: 1/16" (-0.0054)
Type: metric drill

Nearest equivalents in other systems

Drills closest to 1.45 mm
System	Drill	Inch	mm	Difference
Fractional	1/16"	0.0625	1.588	+0.0054 in
Number / letter	#54	0.0550	1.397	-0.0021 in

Speeds and feeds: in mild steel an HSS drill starts at about 6,020 RPM and 0.0013 in/rev (7.83 IPM); in 6061 aluminum about 16,730 RPM.

1.45 mm drill speeds and feeds by material

Jobber-length twist drill, D = 0.0571 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

1.45 mm drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	16,730	600	40,140	0.0013	21.8	52.2
Brass / free-machining	150	10,040	400	26,760	0.0011	11.0	29.4
Low-carbon steel (1018)	90	6,020	300	20,070	0.0013	7.83	26.1
Alloy steel (4140, annealed)	70	4,680	250	16,730	0.0013	6.08	21.8
Stainless 304	40	2,680	150	10,040	0.0009	2.41	9.04
Gray cast iron	80	5,350	250	16,730	0.0008	4.28	13.4
Titanium 6Al-4V	25	1,670	100	6,690	0.0007	1.17	4.68
Plastics (acetal)	300	20,070	500	33,450	0.0023	46.2	76.9

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, 6,020 RPM × 0.033 mm/rev = 199 mm/min.

Worked example: 1.45 mm drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.0571 ≈ 6,020 RPM.
Feed for a 0.057 in drill in mild steel ≈ 0.0013 in/rev.
IPM = 6,020 × 0.0013 = 7.83 IPM.

Peck cycle by hole depth

1.45 mm drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 0.171 in (4.4 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 0.285 in (7.3 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 0.457 in (11.6 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 1.45 mm drill

M1.6x0.35 — form (roll) tap, 65% thread · tap speeds and feeds

Nearest drills

1.4 mm: 0.0551 in / 1.400 mm (-0.0020 in)
1.5 mm: 0.0591 in / 1.500 mm (+0.0020 in)
#54: 0.0550 in / 1.397 mm (-0.0021 in)
#53: 0.0595 in / 1.511 mm (+0.0024 in)

Drill speed calculator, prefilled for 1.45 mm Drill finder: sizes near 1.45 mm Metric drill chart Decimal equivalent chart

Common questions

What is a 1.45 mm drill in decimal and mm?: 0.0571 in, or 1.450 mm; nearest fractional drill: 1/16" (0.0625 in, +0.0054 in); nearest number / letter drill: #54 (0.0550 in, -0.0021 in).
What RPM for a 1.45 mm drill in steel?: In low-carbon steel (1018) an HSS 1.45 mm drill (0.0571 in) runs about 6,020 RPM at 90 SFM; a carbide drill about 20,070 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 1.45 mm drill?: About 0.0013 in/rev in mild steel, 0.0013 in/rev in aluminum and 0.0009 in/rev in 304 stainless. At 6,020 RPM that is 7.83 IPM in steel (IPM = RPM × IPR).
What RPM for a 1.45 mm drill in aluminum?: 16,730 RPM with HSS (250 SFM) or up to 40,140 RPM with carbide (600 SFM), feeding about 0.0013 in/rev.
What tap uses a 1.45 mm drill?: M1.6x0.35 (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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