3tpi Dimensions of Connecting Pins and Electrode sockets

Dimensions of Connecting Pins and Sockets 3TPI
	Connecting Pins

	Nominal diameter	Nominal Pin size			Overall Length "L"
	of electrode	"d₁"	x	"L₁"	Maximum	Minimum
Inches	9	5.500	x	8.000	8.000	7.906
mm	225	139.700	x	203.200	203.200	200.820
Inches	10	6.125	x	8.660	8.667	8.573
mm	250	155.580	x	219.960	220.140	217.750
Inches	12	6.975	x	10.660	10.667	10.573
mm	300	177.160	x	270.760	270.940	268.550
Inches	14	8.500	x	12.000	12.000	11.906
mm	350	215.900	x	304.800	304.800	302.420
Inches	16	8.500	x	12.000	12.000	11.906
mm	400	215.900	x	304.800	304.400	302.420
Inches	17	9.500	x	14.000	14.000	13.906
mm	425	241.300	x	355.600	355.600	353.220
Inches	18	9.500	x	14.000	14.000	13.906
mm	450	241.300	x	355.600	355.600	353.220
Inches	20	10.750	x	14.000	14.000	13.906
mm	500	273.050	x	355.600	355.600	353.220

	Electrode Socket
	Nominal diameter	Depth of		Length of	Nominal	Pitch of
	Nominal diameter	socket "L₃"		thread "L₂"	diameter	thread
	of electrode	Minimum		Minimum	"d₂"	"P"
Inches	9	4.187		4.000	5.500	0.333
mm	225	106.360		101.600	139.700	8.470
Inches	10	4.521		4.333	6.125	0.333
mm	250	114.830		110.060	155.580	8.470
Inches	12	5.520		5.333	6.975	0.333
mm	300	140.230		135.460	177.160	8.470
Inches	14	6.187		6.000	8.500	0.333
mm	350	157.160		152.400	215.900	8.470
Inches	16	6.187		6.000	8.500	0.333
mm	400	157.160		152.400	215.900	8.470
Inches	17	7.187		7.000	9.500	0.333
mm	425	182.560		177.800	241.300	8.470
Inches	18	7.187		7.000	9.500	0.333
mm	450	182.560		177.800	241.300	8.470
Inches	20	7.187		7.000	10.750	0.333
mm	500	182.560		177.800	273.050	8.470

AS PER NEMA STANDARDS
IEC STANDARDS ALSO AVAILABLE