UNF fine thread chart

24 sizes · ThreadRef · sample of the first 8 rows

UNF fine thread chart. The Unified fine series with threads per inch, major, pitch and minor diameters and tap drills in inches and millimetres - the companion sheet to the UNC chart.
Size	TPI	Major dia in	Pitch dia in	Minor dia in	Tap drill in	Tap drill mm	Hex A/F
#0-80 UNF	80	0.06	0.0519	0.0465	0.0469	1.19	not defined
#1-72 UNF	72	0.073	0.064	0.058	0.0595	1.51	not defined
#2-64 UNF	64	0.086	0.0759	0.0691	0.07	1.78	not defined
#3-56 UNF	56	0.099	0.0874	0.0797	0.082	2.08	not defined
#4-48 UNF	48	0.112	0.0985	0.0894	0.0935	2.37	not defined
#5-44 UNF	44	0.125	0.1102	0.1004	0.104	2.64	not defined
#6-40 UNF	40	0.138	0.1218	0.1109	0.113	2.87	not defined
#8-36 UNF	36	0.164	0.146	0.1339	0.136	3.45	not defined

Dimensions per ASME B1.1 (Unified inch screw threads); wrench sizes per ASME B18.2.1.

Torque figures are estimates that depend on the stated nut-factor assumption. Verify against your fastener manufacturer's data and joint requirements before assembly.

Every figure on this chart is also free on its own size page - browse the full reference. Premium pays for the sheet, not the numbers.