What is a 2.75 mm drill in decimal and mm?

0.1083 in, or 2.750 mm; nearest fractional drill: 7/64" (0.1094 in, +0.0011 in); nearest number / letter drill: #35 (0.1100 in, +0.0017 in).

What RPM for a 2.75 mm drill in steel?

In low-carbon steel (1018) an HSS 2.75 mm drill (0.1083 in) runs about 3,180 RPM at 90 SFM; a carbide drill about 10,580 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 2.75 mm drill?

About 0.0026 in/rev in mild steel, 0.0025 in/rev in aluminum and 0.0017 in/rev in 304 stainless. At 3,180 RPM that is 8.27 IPM in steel (IPM = RPM × IPR).

What RPM for a 2.75 mm drill in aluminum?

8,820 RPM with HSS (250 SFM) or up to 21,170 RPM with carbide (600 SFM), feeding about 0.0025 in/rev.

2.75 mm drill size

A 2.75 mm metric drill is 0.1083 in (2.750 mm). It is the cut tap, 50% thread drill for M3x0.35.

Decimal inch: 0.1083
Millimeters: 2.750
Nearest 1/64: 7/64" (-0.0011)
Type: metric drill

Nearest equivalents in other systems

Drills closest to 2.75 mm
System	Drill	Inch	mm	Difference
Fractional	7/64"	0.1094	2.778	+0.0011 in
Number / letter	#35	0.1100	2.794	+0.0017 in

Speeds and feeds: in mild steel an HSS drill starts at about 3,180 RPM and 0.0026 in/rev (8.27 IPM); in 6061 aluminum about 8,820 RPM.

2.75 mm drill speeds and feeds by material

Jobber-length twist drill, D = 0.1083 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

2.75 mm drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	8,820	600	21,170	0.0025	22.1	52.9
Brass / free-machining	150	5,290	400	14,110	0.0021	11.1	29.6
Low-carbon steel (1018)	90	3,180	300	10,580	0.0026	8.27	27.5
Alloy steel (4140, annealed)	70	2,470	250	8,820	0.0026	6.42	22.9
Stainless 304	40	1,410	150	5,290	0.0017	2.40	8.99
Gray cast iron	80	2,820	250	8,820	0.0016	4.51	14.1
Titanium 6Al-4V	25	880	100	3,530	0.0013	1.14	4.59
Plastics (acetal)	300	10,580	500	17,640	0.0043	45.5	75.8

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, 3,180 RPM × 0.066 mm/rev = 210 mm/min.

Worked example: 2.75 mm drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.1083 ≈ 3,180 RPM.
Feed for a 0.108 in drill in mild steel ≈ 0.0026 in/rev.
IPM = 3,180 × 0.0026 = 8.27 IPM.

Peck cycle by hole depth

2.75 mm drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 0.325 in (8.3 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 0.541 in (13.8 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 0.866 in (22 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 2.75 mm drill

M3x0.35 — cut tap, 50% thread

Nearest drills

7/64": 0.1094 in / 2.778 mm (+0.0011 in)
#35: 0.1100 in / 2.794 mm (+0.0017 in)
#36: 0.1065 in / 2.705 mm (-0.0018 in)
2.7 mm: 0.1063 in / 2.700 mm (-0.0020 in)

Drill speed calculator, prefilled for 2.75 mm Drill finder: sizes near 2.75 mm Metric drill chart Decimal equivalent chart

Common questions

What is a 2.75 mm drill in decimal and mm?: 0.1083 in, or 2.750 mm; nearest fractional drill: 7/64" (0.1094 in, +0.0011 in); nearest number / letter drill: #35 (0.1100 in, +0.0017 in).
What RPM for a 2.75 mm drill in steel?: In low-carbon steel (1018) an HSS 2.75 mm drill (0.1083 in) runs about 3,180 RPM at 90 SFM; a carbide drill about 10,580 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 2.75 mm drill?: About 0.0026 in/rev in mild steel, 0.0025 in/rev in aluminum and 0.0017 in/rev in 304 stainless. At 3,180 RPM that is 8.27 IPM in steel (IPM = RPM × IPR).
What RPM for a 2.75 mm drill in aluminum?: 8,820 RPM with HSS (250 SFM) or up to 21,170 RPM with carbide (600 SFM), feeding about 0.0025 in/rev.
What tap uses a 2.75 mm drill?: M3x0.35 (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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