Is this thread pitch chart enough for production work?

It is a fast reference, not a substitute for the drawing, tooling supplier, material requirements, or applicable standards.

Why do different charts sometimes disagree?

Charts can assume different thread engagement, tap type, material, tolerance class, or rounding to available drill sizes.

Shop reference tools

Compare common thread pitches and where to use coarse vs fine thread references.

Start with the table, then use the related pages for tapping, clearance holes, pilot holes, and printable shop sheets.

Thread	System	Major diameter	Pitch	Threads per inch
#4-40 UNC	UNC	0.112 in	0.635 mm	40
#6-32 UNC	UNC	0.138 in	0.794 mm	32
#8-32 UNC	UNC	0.164 in	0.794 mm	32
#10-24 UNC	UNC	0.190 in	1.058 mm	24
#10-32 UNF	UNF	0.190 in	0.794 mm	32
1/4-20 UNC	UNC	0.250 in	1.270 mm	20
1/4-28 UNF	UNF	0.250 in	0.907 mm	28
5/16-18 UNC	UNC	0.313 in	1.411 mm	18
5/16-24 UNF	UNF	0.313 in	1.058 mm	24
3/8-16 UNC	UNC	0.375 in	1.587 mm	16
3/8-24 UNF	UNF	0.375 in	1.058 mm	24
1/2-13 UNC	UNC	0.500 in	1.954 mm	13
1/2-20 UNF	UNF	0.500 in	1.270 mm	20
M3 x 0.5	Metric	3.00 mm	0.500 mm	50.80
M4 x 0.7	Metric	4.00 mm	0.700 mm	36.29
M5 x 0.8	Metric	5.00 mm	0.800 mm	31.75
M6 x 1	Metric	6.00 mm	1.000 mm	25.40
M8 x 1.25	Metric	8.00 mm	1.250 mm	20.32
M10 x 1.5	Metric	10.00 mm	1.500 mm	16.93
M12 x 1.75	Metric	12.00 mm	1.750 mm	14.51