UNC Thread

The UNC thread is the "American coarse thread" and is used in the USA. It is comparable to the metric standard thread in Europe. In the UNC thread table below you will find technical data as well as tightening torque for UNC threads.

Example:

1/4 inch - 20 x 1/2 inch hex bolt

1/4 = Thread outer diameter 6.35 mm

20 = number of threads to inch (25.4 mm) length

1/2 = length of screw from head 12,70 mm

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UNC Thread Chart

UNC (Coarse Thread) Flank Angle60°
Technical Data:			Tightening Torque in (Nm):
Inch	Gear number per Inch (Zoll)	Thread Ø autside in mm	Grade 1 (equivalent to 4.6)	Grade 2 (equivalent to 5.6)	Grade 5 (equivalent to 8.8)	Grade 8 (equivalent to 10.9)
Nr. 00 (UNC 00-90)	90	1,194 mm
Nr. 1 (UNC 1-64)	64	1,854 mm
Nr. 2 (UNC 2-56)	56	2,184 mm
Nr. 3 (UNC 3-48)	48	2,515 mm
Nr. 4 (UNC 4-40)	40	2,845 mm
Nr. 5 (UNC 5-40)	40	3,175 mm
Nr. 6 (UNC 6-32)	32	3,505 mm
Nr. 8 (UNC 8-32)	32	4,166 mm
Nr. 10 (UNC 10-24)	24	4,826 mm
Nr. 12 (UNC 12-24)	24	5,486 mm
1/64"		0,397 mm
1/32"		0,794 mm
1/16"		1,588 mm
1/8"		3,175 mm
1/4"	20	6,350 mm	4	7	9	14
5/16"	18	7,938 mm	8	12	20	28
3/8"	16	9,525 mm	14	23	37	52
7/16"	14	11,112 mm	23	37	58	81
1/2"	13	12,700 mm	35	54	88	125
9/16"	12	14,288 mm	50	79	127	180
5/8"	11	15,875 mm	69	110	176	250
11/16"	11	17,462 mm
3/4"	10	19,050 mm	122	194	313	442
13/16"	10	20,638 mm
7/8"	9	22,225 mm	197	263	504	712
15/16"	9	23,812 mm
1"	8	25,400 mm	296	395	755	1067
1 1/8"	7	28,575 mm	419	559	1071	1513
1 1/4"	7	31,750 mm	591	788	1511	2136
1 3/8"	6	34,925 mm	776	1033	1981	2799
1 1/2"	6	38,100 mm	1029	1372	2629	3715
1 9/16"		39,688 mm
1 5/8"	5	41,275 mm	1275	1699	3257	4601
1 3/4"	5	44,450 mm	1623	2164	4147	5859
2"		50,800 mm	2439	3252	6234	8807
2 1/4"		57,150 mm	3568	4755	9116	12881
2 1/2"		63,500 mm	4880	6507	12471	17623

* All information without guarantee.

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