What is a 7.5 mm drill in decimal and mm?

0.2953 in, or 7.500 mm; nearest fractional drill: 19/64" (0.2969 in, +0.0016 in); nearest number / letter drill: Letter M (0.2950 in, -0.0003 in).

What RPM for a 7.5 mm drill in steel?

In low-carbon steel (1018) an HSS 7.5 mm drill (0.2953 in) runs about 1,160 RPM at 90 SFM; a carbide drill about 3,880 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.

What feed for a 7.5 mm drill?

About 0.0076 in/rev in mild steel, 0.0069 in/rev in aluminum and 0.0050 in/rev in 304 stainless. At 1,160 RPM that is 8.82 IPM in steel (IPM = RPM × IPR).

What RPM for a 7.5 mm drill in aluminum?

3,230 RPM with HSS (250 SFM) or up to 7,760 RPM with carbide (600 SFM), feeding about 0.0069 in/rev.

What size is a 7.5 mm drill?

0.2953 in / 7.500 mm. The nearest other drills are Letter M (0.2950 in), 19/64" (0.2969 in), 7.6 mm (0.2992 in).

7.5 mm drill size

A 7.5 mm metric drill is 0.2953 in (7.500 mm).

Decimal inch: 0.2953
Millimeters: 7.500
Nearest 1/64: 19/64" (-0.0016)
Type: metric drill

Nearest equivalents in other systems

Drills closest to 7.5 mm
System	Drill	Inch	mm	Difference
Fractional	19/64"	0.2969	7.541	+0.0016 in
Number / letter	Letter M	0.2950	7.493	-0.0003 in

Speeds and feeds: in mild steel an HSS drill starts at about 1,160 RPM and 0.0076 in/rev (8.82 IPM); in 6061 aluminum about 3,230 RPM.

7.5 mm drill speeds and feeds by material

Jobber-length twist drill, D = 0.2953 in. RPM = 3.82 × SFM ÷ D, rounded to 10. Feed per rev scales with diameter and material; IPM = RPM × IPR.

7.5 mm drilling speeds
Material	HSS SFM	HSS RPM	Carbide SFM	Carbide RPM	Feed (in/rev)	HSS IPM	Carbide IPM
Aluminum (6061)	250	3,230	600	7,760	0.0069	22.3	53.5
Brass / free-machining	150	1,940	400	5,170	0.0056	10.9	28.9
Low-carbon steel (1018)	90	1,160	300	3,880	0.0076	8.82	29.5
Alloy steel (4140, annealed)	70	910	250	3,230	0.0079	7.19	25.5
Stainless 304	40	520	150	1,940	0.0050	2.60	9.70
Gray cast iron	80	1,030	250	3,230	0.0052	5.36	16.8
Titanium 6Al-4V	25	320	100	1,290	0.0035	1.12	4.51
Plastics (acetal)	300	3,880	500	6,470	0.0044	17.1	28.5

Metric: Vc (m/min) = SFM × 0.3048; feed (mm/rev) = in/rev × 25.4. In steel, 1,160 RPM × 0.193 mm/rev = 224 mm/min.

Worked example: 7.5 mm drill in 1018 steel

HSS drill in low-carbon steel: 90 SFM.
RPM = 3.82 × 90 ÷ 0.2953 ≈ 1,160 RPM.
Feed for a 0.295 in drill in mild steel ≈ 0.0076 in/rev.
IPM = 1,160 × 0.0076 = 8.82 IPM.

Peck cycle by hole depth

7.5 mm drill: depth and canned cycle
Depth	Cycle	Peck	Note
3×D = 0.886 in (22.5 mm)	G81 (no peck)	None	Up to 3×D a sharp drill clears chips on its own.
5×D = 1.476 in (37.5 mm)	G73 chip-break	1 × D	Chip-break pecks; full retract if chips pack (soft aluminum, stainless).
8×D = 2.362 in (60 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 7.5 mm drill

No standard UNC, UNF or metric tap in our tables calls for a 7.5 mm drill. Use it for clearance, pilot or reamer prep holes.

Nearest drills

Letter M: 0.2950 in / 7.493 mm (-0.0003 in)
19/64": 0.2969 in / 7.541 mm (+0.0016 in)
7.6 mm: 0.2992 in / 7.600 mm (+0.0039 in)
7.4 mm: 0.2913 in / 7.400 mm (-0.0039 in)

Drill speed calculator, prefilled for 7.5 mm Drill finder: sizes near 7.5 mm Metric drill chart Decimal equivalent chart

Common questions

What is a 7.5 mm drill in decimal and mm?: 0.2953 in, or 7.500 mm; nearest fractional drill: 19/64" (0.2969 in, +0.0016 in); nearest number / letter drill: Letter M (0.2950 in, -0.0003 in).
What RPM for a 7.5 mm drill in steel?: In low-carbon steel (1018) an HSS 7.5 mm drill (0.2953 in) runs about 1,160 RPM at 90 SFM; a carbide drill about 3,880 RPM at 300 SFM. RPM = 3.82 × SFM ÷ D.
What feed for a 7.5 mm drill?: About 0.0076 in/rev in mild steel, 0.0069 in/rev in aluminum and 0.0050 in/rev in 304 stainless. At 1,160 RPM that is 8.82 IPM in steel (IPM = RPM × IPR).
What RPM for a 7.5 mm drill in aluminum?: 3,230 RPM with HSS (250 SFM) or up to 7,760 RPM with carbide (600 SFM), feeding about 0.0069 in/rev.
What size is a 7.5 mm drill?: 0.2953 in / 7.500 mm. The nearest other drills are Letter M (0.2950 in), 19/64" (0.2969 in), 7.6 mm (0.2992 in).

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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