Fine Threads Series, UNF

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Engineering Formulae

Standard Threads

Acme Standard Threads	Whitworth's Standard Screw Threads for Bolts
Whitworth's Standard Threads for Pipes	British Standard Pipe Threads
International Standard Threads (Metric System)	British Standard Fine Screw Thread
Coarse Thread Series, UNC	Fine Thread Series, UNF

Fine Thread Series, UNF

Basic Sizes

1	2	3	4	5	6
Designation	Pitch (inches)	Major Diameter	Effective Diameter	Minor Diameter
Designation	Pitch (inches)	Nut and Bolt (inches)	Nut and Bolt (inches)	Nut (inches)	Bolt (inches)
	0.03571	0.2500	0.2268	0.2113	0.2062
	0.04167	0.3125	0.2854	0.2674	0.2614
	0.04167	0.3750	0.3479	0.3299	0.3239

	0.05000	0.4375	0.4050	0.3834	0.3762
	0.05000	0.5000	0.4675	0.4459	0.4387
	0.05556	0.5625	0.5264	0.5024	0.4943

	0.05556	0.6250	0.5889	0.5649	0.5568
	0.06250	0.7500	0.7094	0.6823	0.6733
	0.07143	0.8750	0.8286	0.7977	0.7874

	0.08333	1.0000	0.9459	0.9098	0.8978
	0.08333	1.1250	1.0709	1.0348	1.0228
	0.08333	1.2500	1.1959	1.1598	1.1478

	0.08333	1.3750	1.3209	1.2848	1.2728
	0.08333	1.5000	1.4459	1.4098	1.3978

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