What is a 29/32" drill in decimal and mm?

0.9063 in, or 23.019 mm; nearest number / letter drill: Letter Z (0.4130 in, -0.4933 in); nearest metric drill: 23.0 mm (0.9055 in, -0.0007 in).

What RPM for a 29/32" drill in steel?

In low-carbon steel (1018) an HSS 29/32" drill (0.9063 in) runs about 380 RPM at 90 SFM; a carbide drill about 1,260 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 29/32" drill?

About 0.0121 in/rev in mild steel, 0.0123 in/rev in aluminum and 0.0101 in/rev in 304 stainless. At 380 RPM that is 4.60 IPM in steel (IPM = RPM × IPR).

What RPM for a 29/32" drill in aluminum?

1,050 RPM with HSS (250 SFM) or up to 2,530 RPM with carbide (600 SFM), feeding about 0.0123 in/rev.

What tap uses a 29/32" drill?

15/16-20 (cut tap, 50% thread).

29/32" drill size

A 29/32" fractional drill is 0.9063 in (23.019 mm). It is the cut tap, 50% thread drill for 15/16-20.

Decimal inch: 0.9063
Millimeters: 23.019
Nearest 1/64: 29/32" (+0.0000)
Type: fractional drill

Nearest equivalents in other systems

Drills closest to 29/32"
System	Drill	Inch	mm	Difference
Number / letter	Letter Z	0.4130	10.490	-0.4933 in
Metric	23.0 mm	0.9055	23.000	-0.0007 in

Speeds and feeds: in mild steel an HSS drill starts at about 380 RPM and 0.0121 in/rev (4.60 IPM); in 6061 aluminum about 1,050 RPM.

29/32" drill speeds and feeds by material

Jobber-length twist drill, D = 0.9063 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

29/32" drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	1,050	600	2,530	0.0123	12.9	31.1
Brass / free-machining	150	630	400	1,690	0.0096	6.05	16.2
Low-carbon steel (1018)	90	380	300	1,260	0.0121	4.60	15.3
Alloy steel (4140, annealed)	70	300	250	1,050	0.0126	3.78	13.2
Stainless 304	40	170	150	630	0.0101	1.72	6.36
Gray cast iron	80	340	250	1,050	0.0106	3.60	11.1
Titanium 6Al-4V	25	110	100	420	0.0058	0.64	2.44
Plastics (acetal)	300	1,260	500	2,110	0.0076	9.58	16.0

Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 380 RPM × 0.307 mm/rev = 117 mm/min.

Worked example: 29/32" drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.9063 ≈ 380 RPM.
Feed for a 0.906 in drill in mild steel ≈ 0.0121 in/rev.
IPM = 380 × 0.0121 = 4.60 IPM.

Peck cycle by hole depth

29/32" drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 2.719 in (69.1 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 4.531 in (115.1 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 7.250 in (184.2 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 29/32" drill

15/16-20 — cut tap, 50% thread

Nearest drills

23.0 mm: 0.9055 in / 23.000 mm (-0.0007 in)
23.25 mm: 0.9153 in / 23.250 mm (+0.0091 in)
22.75 mm: 0.8957 in / 22.750 mm (-0.0106 in)
57/64": 0.8906 in / 22.622 mm (-0.0156 in)

Drill speed calculator, prefilled for 29/32"Drill finder: sizes near 29/32"Fractional drill chart Decimal equivalent chart

Common questions

What is a 29/32" drill in decimal and mm?: 0.9063 in, or 23.019 mm; nearest number / letter drill: Letter Z (0.4130 in, -0.4933 in); nearest metric drill: 23.0 mm (0.9055 in, -0.0007 in).
What RPM for a 29/32" drill in steel?: In low-carbon steel (1018) an HSS 29/32" drill (0.9063 in) runs about 380 RPM at 90 SFM; a carbide drill about 1,260 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 29/32" drill?: About 0.0121 in/rev in mild steel, 0.0123 in/rev in aluminum and 0.0101 in/rev in 304 stainless. At 380 RPM that is 4.60 IPM in steel (IPM = RPM × IPR).
What RPM for a 29/32" drill in aluminum?: 1,050 RPM with HSS (250 SFM) or up to 2,530 RPM with carbide (600 SFM), feeding about 0.0123 in/rev.
What tap uses a 29/32" drill?: 15/16-20 (cut tap, 50% 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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