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Thread Code Comparison Chart
Common Industry Standard	Alternate industry Standard	PennEngineering Thread Code	ATLAS SpinTite® Thread Code	ATLAS MaxTite® Thread Code
#0-80	.060 - 80	080	—	—
#1 - 64	.073 - 64	164	—	—
#1 - 72	.073 - 72	172	—	—
#2 - 56	.086 - 56	256	—	—
#2 - 64	.086 - 64	264	—	—
#3 - 48	.099 - 48	348	—	—
#3 - 56	.099 - 56	356	—	—
#4 - 40	.112 - 40	440	440	4
#4 - 48	.112 - 48	448	448	448
#5 - 40	.125 - 40	540	540	5
#5 - 44	.125 - 44	544	544	544
#6 - 32	.138 - 32	632	632	6
#6 - 40	.138 - 40	640	640	640
#8 - 32	.164 - 32	832	832	8
#8 - 36	.164 - 36	836	836	836
#10 - 24	.190 - 24	024	1024	1024
#10 - 32	.190 - 32	032	1032	10
#12 - 24	.216 - 24	1224	1224	12
#12 - 28	.216 - 28	1228	1228	1228
1/4 - 20	.2500 - 20	0420	420	25
1/4 - 28	.2500 - 28	0428	428	2528
5/16 - 18	.3125 - 18	0518	518	31
5/16 - 24	.3125 - 24	0524	524	3124
3/8 - 16	.3750 - 16	0616	616	37
3/8 - 24	.3750 - 24	0624	624	3724
7/16 - 14	.4375 - 14	0714	714	43
7/16 - 20	.4375 - 20	0720	720	4320
1/2 - 13	.5000 - 13	0813	813	50
1/2 - 20	.5000 - 20	0820	820	5020
5/8 - 11	.6250 - 11	1011	1011	—
5/8 - 18	.6250 - 18	1018	1018	—
3/4 - 10	.7500 - 10	1210	1210	—
3/4 - 16	.7500 - 16	1216	1216	—
M1.6 x 0.35	—	M1.6	—	—
M2 x 0.4	—	M2	—	—
M2.5 x 0.45	—	M2.5	—	—
M3 x 0.5	—	M3	350	M3
M3.5 x 0.6	—	M3.5	3560	M3.5
M4 x 0.7	—	M4	470	M4
M5 x 0.8	—	M5	580	M5
M6 x 1	—	M6	610	M6
M8 x 1.25	—	M8	8125	M8
M8 x 1	—	Special	810	Special
M10 x 1.5	—	M10	1015	M10
M10 x 1.25	—	Special	10125	Special
M10 x 1	—	Special	1010	Special
M12 x 1.75	—	M12	12175	M12
M14 x 2	—	M14	1420	M14
M16 x 2	—	M16	1620	M16