What is a 13.3 mm drill in decimal and mm?

0.5236 in, or 13.300 mm; nearest fractional drill: 17/32" (0.5313 in, +0.0076 in); nearest number / letter drill: Letter Z (0.4130 in, -0.1106 in).

What RPM for a 13.3 mm drill in steel?

In low-carbon steel (1018) an HSS 13.3 mm drill (0.5236 in) runs about 660 RPM at 90 SFM; a carbide drill about 2,190 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 13.3 mm drill?

About 0.0106 in/rev in mild steel, 0.0101 in/rev in aluminum and 0.0086 in/rev in 304 stainless. At 660 RPM that is 7.00 IPM in steel (IPM = RPM × IPR).

What RPM for a 13.3 mm drill in aluminum?

1,820 RPM with HSS (250 SFM) or up to 4,380 RPM with carbide (600 SFM), feeding about 0.0101 in/rev.

What tap uses a 13.3 mm drill?

M14x1.5 (form (roll) tap, 65% thread).

13.3 mm drill size

A 13.3 mm metric drill is 0.5236 in (13.300 mm). It is the form (roll) tap, 65% thread drill for M14x1.5.

Decimal inch: 0.5236
Millimeters: 13.300
Nearest 1/64: 17/32" (-0.0076)
Type: metric drill

Nearest equivalents in other systems

Drills closest to 13.3 mm
System	Drill	Inch	mm	Difference
Fractional	17/32"	0.5313	13.494	+0.0076 in
Number / letter	Letter Z	0.4130	10.490	-0.1106 in

Speeds and feeds: in mild steel an HSS drill starts at about 660 RPM and 0.0106 in/rev (7.00 IPM); in 6061 aluminum about 1,820 RPM.

13.3 mm drill speeds and feeds by material

Jobber-length twist drill, D = 0.5236 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

13.3 mm drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	1,820	600	4,380	0.0101	18.4	44.2
Brass / free-machining	150	1,090	400	2,920	0.0083	9.05	24.2
Low-carbon steel (1018)	90	660	300	2,190	0.0106	7.00	23.2
Alloy steel (4140, annealed)	70	510	250	1,820	0.0115	5.87	20.9
Stainless 304	40	290	150	1,090	0.0086	2.49	9.37
Gray cast iron	80	580	250	1,820	0.0086	4.99	15.7
Titanium 6Al-4V	25	180	100	730	0.0050	0.90	3.65
Plastics (acetal)	300	2,190	500	3,650	0.0061	13.4	22.3

Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 660 RPM × 0.269 mm/rev = 178 mm/min.

Worked example: 13.3 mm drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.5236 ≈ 660 RPM.
Feed for a 0.524 in drill in mild steel ≈ 0.0106 in/rev.
IPM = 660 × 0.0106 = 7.00 IPM.

Peck cycle by hole depth

13.3 mm drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 1.571 in (39.9 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 2.618 in (66.5 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 4.189 in (106.4 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 13.3 mm drill

M14x1.5 — form (roll) tap, 65% thread

Nearest drills

13.2 mm: 0.5197 in / 13.200 mm (-0.0039 in)
13.4 mm: 0.5276 in / 13.400 mm (+0.0039 in)
17/32": 0.5313 in / 13.494 mm (+0.0076 in)
13.1 mm: 0.5158 in / 13.100 mm (-0.0079 in)

Drill speed calculator, prefilled for 13.3 mm Drill finder: sizes near 13.3 mm Metric drill chart Decimal equivalent chart

Common questions

What is a 13.3 mm drill in decimal and mm?: 0.5236 in, or 13.300 mm; nearest fractional drill: 17/32" (0.5313 in, +0.0076 in); nearest number / letter drill: Letter Z (0.4130 in, -0.1106 in).
What RPM for a 13.3 mm drill in steel?: In low-carbon steel (1018) an HSS 13.3 mm drill (0.5236 in) runs about 660 RPM at 90 SFM; a carbide drill about 2,190 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 13.3 mm drill?: About 0.0106 in/rev in mild steel, 0.0101 in/rev in aluminum and 0.0086 in/rev in 304 stainless. At 660 RPM that is 7.00 IPM in steel (IPM = RPM × IPR).
What RPM for a 13.3 mm drill in aluminum?: 1,820 RPM with HSS (250 SFM) or up to 4,380 RPM with carbide (600 SFM), feeding about 0.0101 in/rev.
What tap uses a 13.3 mm drill?: M14x1.5 (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.

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