Standard Sizes and Weights of Nipples When ordering, please specify the type of nipple required by nominating "Designation of Required Nipples"

a.3TPI Tapered Nipples and Sockets

Designation	Nominal Diameter of electrode	Nipple		Depth of Socket(C) (Minimum)	Pitch of Thread(P)	Average Weight of Nipple	Industrial Standards
		Dia.(A) (Maximum)	Length(L) (Maximum)
	mm	mm	mm	mm	mm	kg
14T3	350	215.90	304.80	158.40	8.467	14.8	JIS	IEC	NEMA
14T3	400	215.90	304.80	158.40	8.467	14.8	JIS	IEC	NEMA
16T3	400	241.30	338.70	175.30	8.467	20.8	JIS	IEC	NEMA
16T3L	400	241.30	355.60	183.80	8.467	21.2	-	-	NEMA
16T3	450	241.30	338.70	175.30	8.467	20.8	JIS	IEC	-
18T3	450	273.05	355.60	183.80	8.467	28.4	JIS	IEC	-
18T3	500	273.05	355.60	183.80	8.467	28.4	JIS	IEC	-
18T3L	500	273.05	457.20	234.60	8.467	34.5	-	-	NEMA
20T3	500	298.45	372.50	192.20	8.467	36.7	JIS	IEC	NEMA
20T3	550	298.45	372.50	192.20	8.467	36.7	JIS	IEC	NEMA

JIS:Japanese Industrial Standard IEC:International Electrical Commission

NEMA:National Electrical Manufactures Association

b.4TPI Tapered Nipples and Sockets

Designation	Nominal Diameter of electrode	Nipple		Depth of Socket(C) (Minimum)	Pitch of Thread(P)	Average Weight of Nipple	Industrial Standards
		Dia.(A) (Maximum)	Length(L) (Maximum)
	mm	mm	mm	mm	mm	kg
14T4	350	203.20	254.00	133.00	6.350	11.5	JIS	-	-
16T4	400	222.25	304.80	158.40	6.350	14.7	JIS	-	-
16T4L	400	222.25	355.60	183.80	6.350	18.1	-	IEC	-
18T4	450	241.30	304.80	158.40	6.350	19.4	JIS	IEC	-
20T4	500	269.88	355.60	183.80	6.350	27.9	JIS	IEC	NEMA
20T4L	500	269.88	457.20	234.60	6.350	33.8	-	IEC	NEMA
22T4	550	298.45	355.60	183.80	6.350	35.7	JIS	IEC	-
22T4L	550	298.45	457.20	234.60	6.350	43.4	JIS	IEC	-
24T4	600	317.50	355.60	183.80	6.350	40.6	JIS	IEC	NEMA
24T4L	600	317.50	457.20	234.60	6.350	48.4	-	IEC	NEMA
26T4L	650	355.60	558.80	285.40	6.350	75.0	-	IEC	-
28T4L	700	374.65	558.80	285.40	6.350	84.3	-	IEC	-
30T4L	750	406.40	609.60	310.80	6.350	108.0	-	IEC	-
32T4L	800	431.80	635.00	323.50	6.350	128.0	-	-	-

Note:NEMA Standard is not equal to JIS/IEC Standards, but NEMA is included in JIS/IEC Standards with regard to the tolerance.