What is 6.8 mm in inches?

0.2677 in, the M8×1.25 tap drill; the nearest inch drill is a letter H (0.266 in).

What metric drill replaces a #7?

5.1 mm (0.2008 in) is the closest to a #7 (0.201 in).

Metric drill size chart (1–20 mm)

Metric drills in 0.5 mm steps plus every metric tap drill size, with inch equivalents and the nearest inch drill. Metric tap drills are about major diameter minus pitch: M6×1 → 5.0 mm, M8×1.25 → 6.8 mm.

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Metric drills 1–20 mm
Drill	Inch	mm	Nearest other drills	Tap drill for
1.0 mm	0.0394	1.000	3/64" (0.0469) · #61 (0.0390)	—
1.25 mm	0.0492	1.250	3/64" (0.0469) · #56 (0.0465)	M1.6x0.35
1.35 mm	0.0532	1.350	3/64" (0.0469) · #55 (0.0520)	M1.6x0.35 (50%)
1.45 mm	0.0571	1.450	1/16" (0.0625) · #54 (0.0550)	M1.6x0.35 (form)
1.5 mm	0.0591	1.500	1/16" (0.0625) · #53 (0.0595)	—
1.6 mm	0.0630	1.600	1/16" (0.0625) · #52 (0.0635)	M2x0.4
1.75 mm	0.0689	1.750	1/16" (0.0625) · #50 (0.0700)	M2x0.4 (50%)
1.8 mm	0.0709	1.800	5/64" (0.0781) · #50 (0.0700)	M2x0.4 (form)
2.0 mm	0.0787	2.000	5/64" (0.0781) · #47 (0.0785)	—
2.05 mm	0.0807	2.050	5/64" (0.0781) · #46 (0.0810)	M2.5x0.45
2.2 mm	0.0866	2.200	3/32" (0.0938) · #44 (0.0860)	M2.5x0.45 (50%)
2.3 mm	0.0906	2.300	3/32" (0.0938) · #43 (0.0890)	M2.5x0.45 (form)
2.5 mm	0.0984	2.500	3/32" (0.0938) · #40 (0.0980)	M3×0.5
2.65 mm	0.1043	2.650	7/64" (0.1094) · #37 (0.1040)	M3x0.35
2.7 mm	0.1063	2.700	7/64" (0.1094) · #36 (0.1065)	M3×0.5 (50%)
2.75 mm	0.1083	2.750	7/64" (0.1094) · #35 (0.1100)	M3x0.35 (50%)
2.8 mm	0.1102	2.800	7/64" (0.1094) · #35 (0.1100)	M3×0.5 (form)
2.85 mm	0.1122	2.850	7/64" (0.1094) · #33 (0.1130)	M3x0.35 (form)
2.9 mm	0.1142	2.900	7/64" (0.1094) · #33 (0.1130)	M3.5x0.6
3.0 mm	0.1181	3.000	1/8" (0.1250) · #31 (0.1200)	—
3.1 mm	0.1221	3.100	1/8" (0.1250) · #31 (0.1200)	M3.5x0.6 (50%)
3.2 mm	0.1260	3.200	1/8" (0.1250) · #30 (0.1285)	M3.5x0.6 (form)
3.3 mm	0.1299	3.300	1/8" (0.1250) · #30 (0.1285)	M4×0.7
3.5 mm	0.1378	3.500	9/64" (0.1406) · #29 (0.1360)	M4x0.5, M4×0.7 (50%)
3.7 mm	0.1457	3.700	9/64" (0.1406) · #26 (0.1470)	M4×0.7 (form), M4x0.5 (50%)
3.8 mm	0.1496	3.800	5/32" (0.1563) · #25 (0.1495)	M4x0.5 (form)
4.0 mm	0.1575	4.000	5/32" (0.1563) · #22 (0.1570)	—
4.2 mm	0.1653	4.200	11/64" (0.1719) · #19 (0.1660)	M5×0.8
4.5 mm	0.1772	4.500	11/64" (0.1719) · #16 (0.1770)	M5x0.5, M5×0.8 (50%)
4.7 mm	0.1850	4.700	3/16" (0.1875) · #13 (0.1850)	M5x0.5 (50%)
4.8 mm	0.1890	4.800	3/16" (0.1875) · #12 (0.1890)	M5x0.5 (form)
5.0 mm	0.1968	5.000	13/64" (0.2031) · #9 (0.1960)	M6×1.0
5.4 mm	0.2126	5.400	7/32" (0.2188) · #3 (0.2130)	M6×1.0 (50%)
5.5 mm	0.2165	5.500	7/32" (0.2188) · #3 (0.2130)	M6x0.75 (50%)
5.7 mm	0.2244	5.700	7/32" (0.2188) · #2 (0.2210)	M6x0.75 (form)
6.0 mm	0.2362	6.000	15/64" (0.2344) · Letter B (0.2380)	M7x1
6.4 mm	0.2520	6.400	1/4" (0.2500) · Letter E (0.2500)	M7x1 (50%)
6.5 mm	0.2559	6.500	1/4" (0.2500) · Letter F (0.2570)	—
6.6 mm	0.2598	6.600	17/64" (0.2656) · Letter G (0.2610)	M7x1 (form)
6.8 mm	0.2677	6.800	17/64" (0.2656) · Letter H (0.2660)	M8×1.25
7.0 mm	0.2756	7.000	9/32" (0.2813) · Letter J (0.2770)	M8x1
7.2 mm	0.2835	7.200	9/32" (0.2813) · Letter K (0.2810)	M8×1.25 (50%)
7.4 mm	0.2913	7.400	19/64" (0.2969) · Letter L (0.2900)	M8x1 (50%)
7.5 mm	0.2953	7.500	19/64" (0.2969) · Letter M (0.2950)	—
7.6 mm	0.2992	7.600	19/64" (0.2969) · Letter N (0.3020)	M8x1 (form)
8.0 mm	0.3150	8.000	5/16" (0.3125) · Letter O (0.3160)	—
8.5 mm	0.3347	8.500	21/64" (0.3281) · Letter Q (0.3320)	M10×1.5
8.8 mm	0.3465	8.800	11/32" (0.3438) · Letter S (0.3480)	M10x1.25
9.0 mm	0.3543	9.000	23/64" (0.3594) · Letter T (0.3580)	M10x1, M10×1.5 (50%)
9.2 mm	0.3622	9.200	23/64" (0.3594) · Letter T (0.3580)	M10x1.25 (50%)
9.4 mm	0.3701	9.400	3/8" (0.3750) · Letter U (0.3680)	M10x1.25 (form), M10x1 (50%)
9.5 mm	0.3740	9.500	3/8" (0.3750) · Letter V (0.3770)	—
9.6 mm	0.3780	9.600	3/8" (0.3750) · Letter V (0.3770)	M10x1 (form)
10.0 mm	0.3937	10.000	25/64" (0.3906) · Letter X (0.3970)	—
10.2 mm	0.4016	10.200	13/32" (0.4063) · Letter Y (0.4040)	M12×1.75
10.5 mm	0.4134	10.500	13/32" (0.4063) · Letter Z (0.4130)	M12x1.5
10.8 mm	0.4252	10.800	27/64" (0.4219) · Letter Z (0.4130)	M12x1.25
10.9 mm	0.4291	10.900	27/64" (0.4219) · Letter Z (0.4130)	M12×1.75 (50%)
11.0 mm	0.4331	11.000	7/16" (0.4375) · Letter Z (0.4130)	M12x1.5 (50%)
11.2 mm	0.4409	11.200	7/16" (0.4375) · Letter Z (0.4130)	M12x1.25 (50%)
11.3 mm	0.4449	11.300	7/16" (0.4375) · Letter Z (0.4130)	M12x1.5 (form)
11.4 mm	0.4488	11.400	29/64" (0.4531) · Letter Z (0.4130)	M12x1.25 (form)
11.5 mm	0.4528	11.500	29/64" (0.4531) · Letter Z (0.4130)	—
12.0 mm	0.4724	12.000	15/32" (0.4688) · Letter Z (0.4130)	M14×2.0
12.5 mm	0.4921	12.500	31/64" (0.4844) · Letter Z (0.4130)	M14x1.5
12.7 mm	0.5000	12.700	1/2" (0.5000) · Letter Z (0.4130)	M14×2.0 (50%)
13.0 mm	0.5118	13.000	33/64" (0.5156) · Letter Z (0.4130)	M14x1.5 (50%)
13.1 mm	0.5158	13.100	33/64" (0.5156) · Letter Z (0.4130)	M14×2.0 (form)
13.3 mm	0.5236	13.300	17/32" (0.5313) · Letter Z (0.4130)	M14x1.5 (form)
13.5 mm	0.5315	13.500	17/32" (0.5313) · Letter Z (0.4130)	—
14.0 mm	0.5512	14.000	35/64" (0.5469) · Letter Z (0.4130)	M16×2.0
14.5 mm	0.5709	14.500	37/64" (0.5781) · Letter Z (0.4130)	M16x1.5
14.75 mm	0.5807	14.750	37/64" (0.5781) · Letter Z (0.4130)	M16×2.0 (50%)
15.0 mm	0.5906	15.000	19/32" (0.5938) · Letter Z (0.4130)	M16x1.5 (50%)
15.25 mm	0.6004	15.250	19/32" (0.5938) · Letter Z (0.4130)	M16x1.5 (form)
15.5 mm	0.6102	15.500	39/64" (0.6094) · Letter Z (0.4130)	M18x2.5
16.0 mm	0.6299	16.000	5/8" (0.6250) · Letter Z (0.4130)	—
16.5 mm	0.6496	16.500	21/32" (0.6563) · Letter Z (0.4130)	M18x1.5, M18x2.5 (50%)
17.0 mm	0.6693	17.000	43/64" (0.6719) · Letter Z (0.4130)	M18x2.5 (form), M18x1.5 (50%)
17.25 mm	0.6791	17.250	43/64" (0.6719) · Letter Z (0.4130)	M18x1.5 (form)
17.5 mm	0.6890	17.500	11/16" (0.6875) · Letter Z (0.4130)	M20×2.5
18.0 mm	0.7087	18.000	45/64" (0.7031) · Letter Z (0.4130)	M20x2
18.5 mm	0.7284	18.500	47/64" (0.7344) · Letter Z (0.4130)	M20x1.5, M20×2.5 (50%)
18.75 mm	0.7382	18.750	47/64" (0.7344) · Letter Z (0.4130)	M20x2 (50%)
19.0 mm	0.7480	19.000	3/4" (0.7500) · Letter Z (0.4130)	M20x2 (form), M20x1.5 (50%)
19.25 mm	0.7579	19.250	49/64" (0.7656) · Letter Z (0.4130)	M20x1.5 (form)
19.5 mm	0.7677	19.500	49/64" (0.7656) · Letter Z (0.4130)	M22x2.5
20.0 mm	0.7874	20.000	25/32" (0.7813) · Letter Z (0.4130)	—

Common questions

What is 6.8 mm in inches?: 0.2677 in, the M8×1.25 tap drill; the nearest inch drill is a letter H (0.266 in).
What metric drill replaces a #7?: 5.1 mm (0.2008 in) is the closest to a #7 (0.201 in).

Calculators that use this data

Drill Chart & Size FinderFractional, number, letter and metric drills with decimal equivalents and a nearest-drill finder.Tap Drill ChartRecommended tap drill sizes for UNC, UNF, and metric threads.Drilling CalculationsDrilling RPM, feed per revolution, point allowance and cutting time.

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