What is a 13/32" drill in decimal and mm?

0.4063 in, or 10.319 mm; nearest number / letter drill: Letter Y (0.4040 in, -0.0022 in); nearest metric drill: 10.3 mm (0.4055 in, -0.0007 in).

What RPM for a 13/32" drill in steel?

In low-carbon steel (1018) an HSS 13/32" drill (0.4063 in) runs about 850 RPM at 90 SFM; a carbide drill about 2,820 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 13/32" drill?

About 0.0098 in/rev in mild steel, 0.0089 in/rev in aluminum and 0.0068 in/rev in 304 stainless. At 850 RPM that is 8.33 IPM in steel (IPM = RPM × IPR).

What RPM for a 13/32" drill in aluminum?

2,350 RPM with HSS (250 SFM) or up to 5,640 RPM with carbide (600 SFM), feeding about 0.0089 in/rev.

What tap uses a 13/32" drill?

7/16-14 (form (roll) tap, 65% thread).

13/32" drill size

A 13/32" fractional drill is 0.4063 in (10.319 mm). It is the form (roll) tap, 65% thread drill for 7/16-14.

Decimal inch: 0.4063
Millimeters: 10.319
Nearest 1/64: 13/32" (+0.0000)
Type: fractional drill

Nearest equivalents in other systems

Drills closest to 13/32"
System	Drill	Inch	mm	Difference
Number / letter	Letter Y	0.4040	10.262	-0.0022 in
Metric	10.3 mm	0.4055	10.300	-0.0007 in

Speeds and feeds: in mild steel an HSS drill starts at about 850 RPM and 0.0098 in/rev (8.33 IPM); in 6061 aluminum about 2,350 RPM.

13/32" drill speeds and feeds by material

Jobber-length twist drill, D = 0.4063 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

13/32" drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	2,350	600	5,640	0.0089	20.9	50.2
Brass / free-machining	150	1,410	400	3,760	0.0068	9.59	25.6
Low-carbon steel (1018)	90	850	300	2,820	0.0098	8.33	27.6
Alloy steel (4140, annealed)	70	660	250	2,350	0.0107	7.06	25.1
Stainless 304	40	380	150	1,410	0.0068	2.58	9.59
Gray cast iron	80	750	250	2,350	0.0070	5.25	16.4
Titanium 6Al-4V	25	240	100	940	0.0044	1.06	4.14
Plastics (acetal)	300	2,820	500	4,700	0.0053	14.9	24.9

Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 850 RPM × 0.249 mm/rev = 212 mm/min.

Worked example: 13/32" drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.4063 ≈ 850 RPM.
Feed for a 0.406 in drill in mild steel ≈ 0.0098 in/rev.
IPM = 850 × 0.0098 = 8.33 IPM.

Peck cycle by hole depth

13/32" drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 1.219 in (31 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 2.031 in (51.6 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 3.250 in (82.6 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 13/32" drill

7/16-14 — form (roll) tap, 65% thread · tap speeds and feeds

Nearest drills

10.3 mm: 0.4055 in / 10.300 mm (-0.0007 in)
Letter Y: 0.4040 in / 10.262 mm (-0.0022 in)
10.4 mm: 0.4094 in / 10.400 mm (+0.0032 in)
10.2 mm: 0.4016 in / 10.200 mm (-0.0047 in)

Drill speed calculator, prefilled for 13/32"Drill finder: sizes near 13/32"Fractional drill chart Decimal equivalent chart

Common questions

What is a 13/32" drill in decimal and mm?: 0.4063 in, or 10.319 mm; nearest number / letter drill: Letter Y (0.4040 in, -0.0022 in); nearest metric drill: 10.3 mm (0.4055 in, -0.0007 in).
What RPM for a 13/32" drill in steel?: In low-carbon steel (1018) an HSS 13/32" drill (0.4063 in) runs about 850 RPM at 90 SFM; a carbide drill about 2,820 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 13/32" drill?: About 0.0098 in/rev in mild steel, 0.0089 in/rev in aluminum and 0.0068 in/rev in 304 stainless. At 850 RPM that is 8.33 IPM in steel (IPM = RPM × IPR).
What RPM for a 13/32" drill in aluminum?: 2,350 RPM with HSS (250 SFM) or up to 5,640 RPM with carbide (600 SFM), feeding about 0.0089 in/rev.
What tap uses a 13/32" drill?: 7/16-14 (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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