What is a 2.85 mm drill in decimal and mm?

0.1122 in, or 2.850 mm; nearest fractional drill: 7/64" (0.1094 in, -0.0028 in); nearest number / letter drill: #33 (0.1130 in, +0.0008 in).

What RPM for a 2.85 mm drill in steel?

In low-carbon steel (1018) an HSS 2.85 mm drill (0.1122 in) runs about 3,060 RPM at 90 SFM; a carbide drill about 10,210 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 2.85 mm drill?

About 0.0026 in/rev in mild steel, 0.0026 in/rev in aluminum and 0.0018 in/rev in 304 stainless. At 3,060 RPM that is 7.96 IPM in steel (IPM = RPM × IPR).

What RPM for a 2.85 mm drill in aluminum?

8,510 RPM with HSS (250 SFM) or up to 20,430 RPM with carbide (600 SFM), feeding about 0.0026 in/rev.

What tap uses a 2.85 mm drill?

M3x0.35 (form (roll) tap, 65% thread).

2.85 mm drill size

A 2.85 mm metric drill is 0.1122 in (2.850 mm). It is the form (roll) tap, 65% thread drill for M3x0.35.

Decimal inch: 0.1122
Millimeters: 2.850
Nearest 1/64: 7/64" (+0.0028)
Type: metric drill

Nearest equivalents in other systems

Drills closest to 2.85 mm
System	Drill	Inch	mm	Difference
Fractional	7/64"	0.1094	2.778	-0.0028 in
Number / letter	#33	0.1130	2.870	+0.0008 in

Speeds and feeds: in mild steel an HSS drill starts at about 3,060 RPM and 0.0026 in/rev (7.96 IPM); in 6061 aluminum about 8,510 RPM.

2.85 mm drill speeds and feeds by material

Jobber-length twist drill, D = 0.1122 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

2.85 mm drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	8,510	600	20,430	0.0026	22.1	53.1
Brass / free-machining	150	5,110	400	13,620	0.0022	11.2	30.0
Low-carbon steel (1018)	90	3,060	300	10,210	0.0026	7.96	26.6
Alloy steel (4140, annealed)	70	2,380	250	8,510	0.0026	6.19	22.1
Stainless 304	40	1,360	150	5,110	0.0018	2.45	9.20
Gray cast iron	80	2,720	250	8,510	0.0016	4.35	13.6
Titanium 6Al-4V	25	850	100	3,400	0.0014	1.19	4.76
Plastics (acetal)	300	10,210	500	17,020	0.0045	45.9	76.6

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, 3,060 RPM × 0.066 mm/rev = 202 mm/min.

Worked example: 2.85 mm drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.1122 ≈ 3,060 RPM.
Feed for a 0.112 in drill in mild steel ≈ 0.0026 in/rev.
IPM = 3,060 × 0.0026 = 7.96 IPM.

Peck cycle by hole depth

2.85 mm drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 0.337 in (8.6 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 0.561 in (14.3 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 0.898 in (22.8 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 2.85 mm drill

M3x0.35 — form (roll) tap, 65% thread

Nearest drills

#33: 0.1130 in / 2.870 mm (+0.0008 in)
#34: 0.1110 in / 2.819 mm (-0.0012 in)
2.8 mm: 0.1102 in / 2.800 mm (-0.0020 in)
2.9 mm: 0.1142 in / 2.900 mm (+0.0020 in)

Drill speed calculator, prefilled for 2.85 mm Drill finder: sizes near 2.85 mm Metric drill chart Decimal equivalent chart

Common questions

What is a 2.85 mm drill in decimal and mm?: 0.1122 in, or 2.850 mm; nearest fractional drill: 7/64" (0.1094 in, -0.0028 in); nearest number / letter drill: #33 (0.1130 in, +0.0008 in).
What RPM for a 2.85 mm drill in steel?: In low-carbon steel (1018) an HSS 2.85 mm drill (0.1122 in) runs about 3,060 RPM at 90 SFM; a carbide drill about 10,210 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 2.85 mm drill?: About 0.0026 in/rev in mild steel, 0.0026 in/rev in aluminum and 0.0018 in/rev in 304 stainless. At 3,060 RPM that is 7.96 IPM in steel (IPM = RPM × IPR).
What RPM for a 2.85 mm drill in aluminum?: 8,510 RPM with HSS (250 SFM) or up to 20,430 RPM with carbide (600 SFM), feeding about 0.0026 in/rev.
What tap uses a 2.85 mm drill?: M3x0.35 (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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