US Machine Screws - Dimensions - The Engineering ToolBox

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US Machine Screws - Dimensions

Size no.	Thread Diameter		TPI
	Decimal (in)	Nearest Fractional (in)	Fine	Coarse
	0	0.0600	1/16	80
	1	0.0730	5/64	72	64
	2	0.0860	3/32	64	56
	3	0.0990	7/64	56	48
4	0.1120	7/64	48	40
5	0.1250	1/8	44	40
6	0.1380	9/64	40	32
8	0.1640	5/32	36	32
10	0.1900	3/16	32	24
12	0.2160	7/32	28	24
1/4	0.2500	1/4	28	20
5/16	0.3125	5/16	24	18
3/8	0.3750	3/8	24	16

• TPI = threads per inch
• threads according UNF – Unified National Fine Thread

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Unit Converter

Temperature oC K oF

Length m km in ft yards miles naut miles

Area m2 km2 in2 ft2 miles2 acres

Volume m3 liters in3 ft3 us gal

Weight kgf N lbf

Velocity m/s km/h ft/min ft/s mph knots

Pressure Pa bar atmosphere mm H2O kg/cm2 psi inches H2O

Flow m3/s m3/h US gpm cfm

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