RTJ Flange Dimensions - Class 150 to Class 2500

RTJ flange dimensions are covered in ASME B16.5 – which covers Pipe Flanges and Flanged Fittings for size NPS ½” to 24” for above NPS 26” to 60” it should be as per ASME B16.47.

During a dimensional inspection of the RTJ flange, you should check for

Outer & Inner Diameter of body
Bolt Circle & Bolt hole Diameter
The thickness of weld end
Length of the Hub
Straightness and alignment of the bolt hole
RTJ Groove Dimensions

Class 150 Weld neck RTJ Flange Dimensions

Size in Inch	Size in mm	Outer Dia.	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	RTJ RF Dia	RTJ RF Height	PCD	RTJ Pitch dia	RTJ Depth	RTJ Width	Bore
		A	B	C	D	E	F	G	H	I	J	K	L
1/2	15	90	9.6	30	21.3	46	N/A	N/A	60.3	N/A	N/A	N/A	Welding Neck bore is derived from the pipe schedule
3/4	20	100	11.2	38	26.7	51	N/A	N/A	69.9	N/A	N/A	N/A
1	25	110	12.7	49	33.4	54	63.5	6.35	79.4	47.63	6.35	8.74
1 1/4	32	115	14.3	59	42.2	56	73	6.35	88.9	57.15	6.35	8.74
1 1/2	40	125	15.9	65	48.3	60	82.5	6.35	98.4	65.07	6.35	8.74
2	50	150	17.5	78	60.3	62	102	6.35	120.7	82.55	6.35	8.74
2 1/2	65	180	20.7	90	73	68	121	6.35	139.7	101.6	6.35	8.74
3	80	190	22.3	108	88.9	68	133	6.35	152.4	114.3	6.35	8.74
3 1/2	90	215	22.3	122	101.6	70	154	6.35	177.8	131.78	6.35	8.74
4	100	230	22.3	135	114.3	75	171	6.35	190.5	149.23	6.35	8.74
5	125	255	22.3	164	141.3	87	194	6.35	215.9	171.45	6.35	8.74
6	150	280	23.9	192	168.3	87	219	6.35	241.3	193.68	6.35	8.74
8	200	345	27	246	219.1	100	273	6.35	298.5	247.65	6.35	8.74
10	250	405	28.6	305	273	100	330	6.35	362	304.8	6.35	8.74
12	300	485	30.2	365	323.8	113	406	6.35	431.8	381	6.35	8.74
14	350	535	33.4	400	355.6	125	425	6.35	476.3	396.88	6.35	8.74
16	400	595	35	457	406.4	125	483	6.35	539.8	454.03	6.35	8.74
18	450	635	38.1	505	457.2	138	546	6.35	577.9	517.53	6.35	8.74
20	500	700	41.3	559	508	143	597	6.35	635	558.8	6.35	8.74
24	600	815	46.1	663	610	151	711	6.35	749.3	673.1	6.35	8.74

Class 150 Weld neck RTJ Flange Stud & Bolt Dimensions

RTJ Root Radius	Ring no	Distance Between Flanges	No of Bolts	Bolt Size UNC	Machine Bolt Length	RTJ Stud Length	Hole Size	ISO Stud Size
0.8	N/A	N/A	4	1/2	50	N/A	5/8	M14
0.8	N/A	N/A	4	1/2	50	N/A	5/8	M14
0.8	15	4	4	1/2	55	75	5/8	M14
0.8	17	4	4	1/2	55	85	5/8	M14
0.8	19	4	4	1/2	65	85	5/8	M14
0.8	22	4	4	5/8	70	95	3/4	M16
0.8	25	4	4	5/8	75	100	3/4	M16
0.8	29	4	4	5/8	75	100	3/4	M16
0.8	33	4	8	5/8	75	100	3/4	M16
0.8	36	4	8	5/8	75	100	3/4	M16
0.8	40	4	8	3/4	85	110	7/8	M20
0.8	43	4	8	3/4	85	115	7/8	M20
0.8	48	4	8	3/4	90	120	7/8	M20
0.8	52	4	12	7/8	100	125	1	M24
0.8	56	4	12	7/8	100	135	1	M24
0.8	59	3	12	1	115	145	1 1/8	M27
0.8	64	3	16	1	115	145	1 1/8	M27
0.8	68	3	16	1 1/8	125	160	1 1/4	M30
0.8	72	3	20	1 1/8	140	170	1 1/4	M30
0.8	76	3	20	1 1/4	150	185	1 3/8	M33

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Class 300 Weld neck RTJ Flange Dimensions

Size in Inch	Size in mm	Outer Dia.	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	RTJ RF Dia	RTJ RF Height	PCD	RTJ Pitch dia	RTJ Depth	RTJ Width	Bore
		A	B	C	D	E	F	G	H	I	J	K	L
1/2	15	95	12.7	38	21.3	51	51	5.54	66.7	34.14	5.54	7.14	Welding Neck bore is derived from the pipe schedule
3/4	20	115	14.3	48	26.7	56	63.5	6.35	82.6	42.88	6.35	8.74
1	25	125	15.9	54	33.4	60	70	6.35	88.9	50.8	6.35	8.74
1 1/4	32	135	17.5	64	42.2	64	79.5	6.35	98.4	60.33	6.35	8.74
1 1/2	40	155	19.1	70	48.3	67	90.5	6.35	114.3	68.27	6.35	8.74
2	50	165	20.7	84	60.3	68	108	7.92	127	82.55	7.92	11.91
2 1/2	65	190	23.9	100	73	75	127	7.92	149.2	101.6	7.92	11.91
3	80	210	27	117	88.9	78	146	7.92	168.3	123.83	7.92	11.91
3 1/2	90	230	28.6	133	101.6	79	159	7.92	184.2	131.78	7.92	11.91
4	100	255	30.2	146	114.3	84	175	7.92	200	149.23	7.92	11.91
5	125	280	33.4	178	141.3	97	210	7.92	235	180.98	7.92	11.91
6	150	320	35	206	168.3	97	241	7.92	269.9	211.12	7.92	11.91
8	200	380	39.7	260	219.1	110	302	7.92	330.2	269.88	7.92	11.91
10	250	445	46.1	321	273	116	356	7.92	387.4	323.85	7.92	11.91
12	300	520	49.3	375	323.8	129	413	7.92	450.8	381	7.92	11.91
14	350	585	52.4	425	355.6	141	457	7.92	514.4	419.1	7.92	11.91
16	400	650	55.6	483	406.4	144	508	7.92	571.5	469.9	7.92	11.91
18	450	710	58.8	533	457	157	575	7.92	628.6	533.4	7.92	11.91
20	500	775	62	587	508	160	635	9.53	685.8	584.2	9.53	13.49
24	600	915	68.3	702	610	167	749	11.13	812.8	692.15	11.13	16.66

Class 300 Weld neck RTJ Flange Stud & Bolt Dimensions

RTJ Root Radius	Ring no	Distance Between Flanges	No of Bolts	Bolt Size UNC	Machine Bolt Length	RTJ Stud Length	Hole Size	ISO Stud Size
0.8	R11	3	4	1/2	55	75	5/8	M14
0.8	13	4	4	5/8	65	90	3/4	M16
0.8	16	4	4	5/8	65	90	3/4	M16
0.8	18	4	4	5/8	70	95	3/4	M16
0.8	20	4	4	3/4	75	100	7/8	M20
0.8	23	6	8	5/8	75	100	3/4	M16
0.8	26	6	8	3/4	85	115	7/8	M20
0.8	31	6	8	3/4	90	120	7/8	M20
0.8	34	6	8	3/4	95	125	7/8	M20
0.8	37	6	8	3/4	95	125	7/8	M20
0.8	41	6	8	3/4	110	135	7/8	M20
0.8	45	6	12	3/4	110	140	7/8	M20
0.8	49	6	12	7/8	120	150	1	M24
0.8	53	6	16	1	140	170	1 1/8	M27
0.8	57	6	16	1 1/8	145	185	1 1/4	M30
0.8	61	6	20	1 1/8	160	190	1 1/4	M30
0.8	65	6	20	1 1/4	165	205	1 3/8	M33
0.8	69	6	24	1 1/4	170	210	1 3/8	M33
1.5	73	6	24	1 1/4	185	220	1 3/8	M33
1.5	77	6	24	1 1/2	205	255	1 5/8	M39

Class 400 Weld neck RTJ Flange Dimensions

Size in Inch	Size in mm	Outer Dia.	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	RTJ RF Dia	RTJ RF Height	PCD	RTJ Pitch dia	RTJ Depth	RTJ Width	Bore
		A	B	C	D	E	F	G	H	I	J	K	L
1/2	15	95	14.3	38	21.3	52	51	5.54	66.7	34.14	5.54	7.14	Welding Neck bore is derived from the pipe schedule
3/4	20	115	15.9	48	26.7	57	63.5	6.35	82.6	42.88	6.35	8.74
1	25	125	17.5	54	33.4	62	70	6.35	88.9	50.8	6.35	8.74
1 1/4	32	135	20.7	64	42.2	67	79.5	6.35	98.4	60.33	6.35	8.74
1 1/2	40	155	22.3	70	48.3	70	90.5	6.35	114.3	68.27	6.35	8.74
2	50	165	25.4	84	60.3	73	108	7.92	127	82.55	7.92	11.9
2 1/2	65	190	28.6	100	73	79	127	7.92	149.2	101.6	7.92	11.9
3	80	210	31.8	117	88.9	83	146	7.92	168.3	123.83	7.92	11.9
3 1/2	90	230	35	133	101.6	86	159	7.92	184.2	131.78	7.92	11.9
4	100	255	35	146	114.3	89	175	7.92	200	149.23	7.92	11.91
5	125	280	38.1	178	141.3	102	210	7.92	235	180.98	7.92	11.91
6	150	320	41.3	206	168.3	103	241	7.92	269.9	211.12	7.92	11.91
8	200	380	47.7	260	219.1	117	302	7.92	330	269.88	7.92	11.91
10	250	445	54	321	273	124	356	7.92	387.4	323.85	7.92	11.91
12	300	520	57.2	375	323.8	137	413	7.92	450.8	381	7.92	11.91
14	350	585	60.4	425	355.6	149	457	7.92	514.4	419.1	7.92	11.91
16	400	650	63.5	483	406.4	152	508	7.92	571.5	469.9	7.92	11.91
18	450	710	66.7	533	457	165	575	7.92	628.6	533.4	7.92	11.91
20	500	775	69.9	587	508	168	635	9.53	685.8	584.2	9.53	13.49
24	600	915	76.2	702	610	175	749	11.13	812.8	692.15	11.13	16.66

Class 400 Weld neck RTJ Flange Stud & Bolt Dimensions

RTJ Root Radius	Ring no	Distance Between Flanges	No of Bolts	Bolt Size UNC	RTJ Stud Length	Hole Size	ISO Stud Size
0.8	11	3	4	1/2	75	5/8	M14
0.8	13	4	4	5/8	90	3/4	M16
0.8	16	4	4	5/8	90	3/4	M16
0.8	18	4	4	5/8	95	3/4	M16
0.8	20	4	4	3/4	110	7/8	M20
0.8	23	5	8	5/8	110	3/4	M16
0.8	26	5	8	3/4	120	7/8	M20
0.8	31	5	8	3/4	125	7/8	M20
0.8	34	5	8	7/8	140	1	M24
0.8	37	6	8	7/8	140	1	M24
0.8	41	6	8	7/8	145	1	M24
0.8	45	6	12	7/8	150	1	M24
0.8	49	6	12	1	170	1 1/8	M27
0.8	53	6	16	1 1/8	190	1 1/4	M30
0.8	57	6	16	1 1/4	205	1 3/8	M33
0.8	61	6	20	1 1/4	210	1 3/8	M33
0.8	65	6	20	1 3/8	220	1 1/2	M36
0.8	69	6	24	1 3/8	230	1 1/2	M36
1.5	73	6	24	1 1/2	250	1 3/4	M39
1.5	77	6	24	1 3/4	280	1 7/8	M45

Class 600 Weld neck RTJ Flange Dimensions

Size in Inch	Size in mm	Outer Dia.	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	RTJ RF Dia	RTJ RF Height	PCD	RTJ Pitch dia	RTJ Depth	RTJ Width	Bore
		A	B	C	D	E	F	G	H	I	J	K	L
1/2	15	95	14.3	38	21.3	52	51	5.54	66.7	34.14	5.54	7.14	Welding Neck bore is derived from the pipe schedule
3/4	20	115	15.9	48	26.7	57	63.5	6.35	82.6	42.88	6.35	8.74
1	25	125	17.5	54	33.4	62	70	6.35	88.9	50.8	6.35	8.74
1 1/4	32	135	20.7	64	42.2	67	79.5	6.35	98.4	60.33	6.35	8.74
1 1/2	40	155	22.3	70	48.3	70	90.5	6.35	114.3	68.27	6.35	8.74
2	50	165	25.4	84	60.3	73	108	7.92	127	82.55	7.92	11.91
2 1/2	65	190	28.6	100	73	79	127	7.92	149.2	101.6	7.92	11.91
3	80	210	31.8	117	88.9	83	146	7.92	168.3	123.83	7.92	11.91
3 1/2	90	230	35	133	101.6	86	159	7.92	184.2	131.78	7.92	11.91
4	100	275	38.1	152	114.3	102	175	7.92	215.9	149.23	7.92	11.91
5	125	330	44.5	189	141.3	114	210	7.92	266.7	180.98	7.92	11.91
6	150	355	47.7	222	168.3	117	241	7.92	292.1	211.12	7.92	11.91
8	200	420	55.6	273	219.1	133	302	7.92	349.2	269.88	7.92	11.91
10	250	510	63.5	343	273	152	356	7.92	431.8	323.85	7.92	11.91
12	300	560	66.7	400	323.8	156	413	7.92	489	381	7.92	11.91
14	350	605	69.9	432	355.6	165	457	7.92	527	419.1	7.92	11.91
16	400	685	76.2	495	406.4	178	508	7.92	603.2	469.9	7.92	11.91
18	450	745	82.6	546	457	184	575	7.92	654	533.4	7.92	11.91
20	500	815	88.9	610	508	190	635	9.53	723.9	584.2	9.53	13.49
24	600	940	101.6	718	610	203	749	11.13	838.2	692.15	11.13	16.66

Class 600 Weld neck RTJ Flange Stud & Bolt Dimensions

RTJ Root Radius	Ring no	Distance Between Flanges	No of Bolts	Bolt Size UNC	RTJ Stud Length	Hole Size	ISO Stud Size
0.8	R11	3	4	1/2	75	5/8	M14
0.8	13	4	4	5/8	90	3/4	M16
0.8	16	4	4	5/8	90	3/4	M16
0.8	18	4	4	5/8	95	3/4	M16
0.8	20	4	4	3/4	110	7/8	M20
0.8	23	5	8	5/8	110	3/4	M16
0.8	26	5	8	3/4	120	7/8	M20
0.8	31	5	8	3/4	125	7/8	M20
0.8	34	5	8	7/8	140	1	M24
0.8	37	5	8	7/8	145	1	M24
0.8	41	5	8	1	165	1 1/8	M27
0.8	45	5	12	1	170	1 1/8	M27
0.8	49	5	12	1 1/8	195	1 1/4	M30
0.8	53	5	16	1 1/4	215	1 3/8	M33
0.8	57	5	20	1 1/4	220	1 3/8	M33
0.8	61	5	20	1 3/8	235	1 1/2	M36
0.8	65	5	20	1 1/2	255	1 5/8	M39
0.8	69	5	20	1 5/8	275	1 3/4	M42
1.5	73	5	24	1 5/8	290	1 3/4	M42
1.5	77	6	24	1 7/8	335	2	M48

Class 900 Weld neck RTJ Flange Dimensions

Size in Inch	Size in mm	Outer Dia.	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	RTJ RF Dia	RTJ RF Height	PCD	RTJ Pitch dia	RTJ Depth	RTJ Width	Bore
		A	B	C	D	E	F	G	H	I	J	K	L
1/2	15	120	22.3	38	21.3	60	60.5	6.35	82.6	39.67	6.35	8.74	Welding Neck bore is derived from the pipe schedule
3/4	20	130	25.4	44	26.7	70	66.5	6.35	88.9	44.45	6.35	8.74
1	25	150	28.6	52	33.4	73	71.5	6.35	101.6	50.8	6.35	8.74
1 1/4	32	160	28.6	64	42.2	73	81	6.35	111.1	60.33	6.35	8.74
1 1/2	40	180	31.8	70	48.3	83	92	6.35	123.8	68.27	6.35	8.74
2	50	215	38.1	105	60.3	102	124	7.92	165.1	95.25	7.92	11.91
2 1/2	65	245	41.3	124	73	105	137	7.92	190.5	107.95	7.92	11.91
3	80	240	38.1	127	88.9	102	156	7.92	190.5	123.83	7.92	11.91
4	100	290	44.5	159	114.3	114	181	7.92	235	149.23	7.92	11.91
5	125	350	50.8	190	141.3	127	216	7.92	279.4	180.98	7.92	11.91
6	150	380	55.6	235	168.3	140	241	7.92	317.5	211.12	7.92	11.91
8	200	470	63.5	298	219.1	162	308	7.92	393.7	269.88	7.92	11.91
10	250	545	69.9	368	273	184	362	7.92	469.9	323.85	7.92	11.91
12	300	610	79.4	419	323.8	200	419	7.92	533.4	381	7.92	11.91
14	350	640	85.8	451	355.6	213	467	11.13	558.8	419.1	11.13	16.66
16	400	705	88.9	508	406.4	216	524	11.13	616	469.9	11.13	16.66
18	450	785	101.6	565	457	229	594	12.7	685.8	533.4	12.7	19.84
20	500	855	108	622	508	248	648	12.7	749.3	584.2	12.7	19.84
24	600	1040	139.7	749	610	292	772	15.88	901.7	692.15	15.88	26.97

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Class 900 Weld neck RTJ Flange Stud & Bolt Dimensions

RTJ Root Radius	Ring no	Distance Between Flanges	No of Bolts	Bolt Size UNC	RTJ Stud Length	Hole Size	ISO Stud Size
0.8	12	4	4	3/4	110	7/8	M20
0.8	14	4	4	3/4	115	7/8	M20
0.8	16	4	4	7/8	125	1	M24
0.8	18	4	4	7/8	125	1	M24
0.8	20	4	4	1	140	1 1/8	M27
0.8	24	3	8	7/8	145	1	M24
0.8	27	3	8	1	160	1 1/8	M27
0.8	31	4	8	7/8	145	1	M24
0.8	37	4	8	1 1/8	170	1 1/4	M30
0.8	41	4	8	1 1/4	190	1 3/8	M33
0.8	45	4	12	1 1/8	195	1 1/4	M30
0.8	49	4	12	1 3/8	220	1 1/2	M36
0.8	53	4	16	1 3/8	235	1 1/2	M36
0.8	57	4	20	1 3/8	255	1 1/2	M36
1.5	62	4	20	1 1/2	280	1 5/8	M39
1.5	66	4	20	1 5/8	290	1 3/4	M42
1.5	70	5	20	1 7/8	335	2	M48
1.5	74	5	20	2	360	2 1/8	M52
2.4	78	6	20	2 1/2	455	2 5/8	M64

Class 1500 Weld neck RTJ Flange Dimensions

Size in Inch	Size in mm	Outer Dia.	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	RTJ RF Dia	RTJ RF Height	PCD	RTJ Pitch dia	RTJ Depth	RTJ Width	Bore
		A	B	C	D	E	F	G	H	I	J	K	L
1/2	15	120	22.3	38	21.3	60	60.5	6.35	82.6	39.67	6.35	8.74	Welding Neck bore is derived from the pipe schedule
3/4	20	130	25.4	44	26.7	70	66.5	6.35	88.9	44.45	6.35	8.74
1	25	150	28.6	52	33.4	73	71.5	6.35	101.6	50.8	6.35	8.74
1 1/4	32	160	28.6	64	42.2	73	81	6.35	111.1	60.33	6.35	8.74
1 1/2	40	180	31.8	70	48.3	83	92	6.35	123.8	68.27	6.35	8.74
2	50	215	38.1	105	60.3	102	124	7.92	165.1	95.25	7.92	11.91
2 1/2	65	245	41.3	124	73	105	137	7.92	190.5	107.95	7.92	11.91
3	80	265	47.7	133	88.9	117	168	7.92	203.2	136.53	7.92	11.91
4	100	310	54	162	114.3	124	194	7.92	241.3	161.93	7.92	11.91
5	125	375	73.1	197	141.3	156	229	7.92	292.1	193.68	7.92	11.91
6	150	395	82.6	229	168.3	171	248	9.53	317.5	211.14	9.53	13.49
8	200	485	92.1	292	219.1	213	318	11.13	393.7	269.88	11.13	16.66
10	250	585	108	368	273	254	371	11.13	482.6	323.85	11.13	16.66
12	300	675	123.9	451	323.8	283	438	14.27	571.5	381	14.27	23.01
14	350	750	133.4	495	355.6	298	489	15.88	635	419.1	15.88	26.97
16	400	825	146.1	552	406.4	311	546	17.48	704.8	469.9	17.48	30.18
18	450	915	162	597	457	327	613	17.48	774.7	533.4	17.48	30.18
20	500	985	177.8	641	508	356	673	17.48	831.8	584.2	17.48	33.32
24	600	1170	203.2	762	610	406	794	20.62	990.6	692.15	20.62	36.53

Class 1500 Weld neck RTJ Flange Stud & Bolt Dimensions

RTJ Root Radius	Ring no	Distance Between Flanges	No of Bolts	Bolt Size UNC	RTJ Stud Length	Hole Size	ISO Stud Size
0.8	12	4	4	3/4	110	7/8	M20
0.8	14	4	4	3/4	115	7/8	M20
0.8	16	4	4	7/8	125	1	M24
0.8	18	4	4	7/8	125	1	M24
0.8	20	4	4	1	140	1 1/8	M27
0.8	24	3	8	7/8	145	1	M24
0.8	27	3	8	1	160	1 1/8	M27
0.8	35	3	8	1 1/8	180	1 1/4	M30
0.8	39	3	8	1 1/4	195	1 3/8	M33
0.8	44	3	8	1 1/2	250	1 5/8	M39
1.5	46	3	12	1 3/8	265	1 1/2	M36
1.5	50	4	12	1 5/8	325	1 3/4	M42
1.5	54	4	12	1 7/8	345	2	M48
1.5	58	5	16	2	385	2 1/8	M52
2.4	63	6	16	2 1/4	425	2 3/8	M56
2.4	67	8	16	2 1/2	470	2 5/8	M64
2.4	71	8	16	2 3/4	525	2 7/8	M72
2.4	75	10	16	3	565	3 1/8	M76
2.4	79	11	16	3 1/2	650	3 5/8	M90

Class 2500 Weld neck RTJ Flange Dimensions

Size in Inch	Size in mm	Outer Dia.	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	RTJ RF Dia	RTJ RF Height	PCD	RTJ Pitch dia	RTJ Depth	RTJ Width	Bore
		A	B	C	D	E	F	G	H	I	J	K	L
1/2	15	135	30.2	43	21.3	73	65	6.35	88.9	42.88	6.35	8.74	Welding Neck bore is derived from the pipe schedule
3/4	20	140	31.8	51	26.7	79	73	6.35	95.2	50.8	6.35	8.74
1	25	160	35	57	33.4	89	82.5	6.35	108	60.33	6.35	8.74
1 1/4	32	185	38.1	73	42.2	95	102	7.92	130.2	72.23	7.92	11.91
1 1/2	40	205	44.5	79	48.3	111	114	7.92	146	82.55	7.92	11.91
2	50	235	50.9	95	60.3	127	133	7.92	171.4	101.6	7.92	11.91
2 1/2	65	265	57.2	114	73	143	149	9.53	196.8	111.13	9.52	13.49
3	80	305	66.7	133	88.9	168	168	9.53	228.6	127	9.52	13.49
4	100	355	76.2	165	114.3	190	203	11.13	273	157.18	11.13	16.66
5	125	420	92.1	203	141.3	229	241	12.7	323.8	190.5	12.7	19.84
6	150	485	108	235	168.3	273	279	12.7	368.3	228.6	12.7	19.84
8	200	550	127	305	219.1	318	340	14.27	438.2	279.4	14.27	23.01
10	250	675	165.1	375	273	419	425	17.48	539.8	342.9	17.48	30.18
12	300	760	184.2	441	323.8	464	495	17.48	619.1	406.4	17.48	33.32

Class 2500 Weld neck RTJ Flange Stud & Bolt Dimensions

RTJ Root Radius	Ring no	Distance Between Flanges	No of Bolts	Bolt Size UNC	RTJ Stud Length	Hole Size	ISO Stud Size
0.8	13	4	4	3/4	120	7/8	M20
0.8	16	4	4	3/4	125	7/8	M20
0.8	18	4	4	7/8	140	1	M24
0.8	21	3	4	1	150	1 1/8	M27
0.8	23	3	4	1 1/8	170	1 1/4	M30
0.8	26	3	8	1	180	1 1/8	M27
1.5	28	3	8	1 1/8	205	1 1/4	M30
1.5	32	3	8	1 1/4	230	1 3/8	M33
1.5	38	4	8	1 1/2	260	1 5/8	M39
1.5	42	4	8	1 3/4	310	1 7/8	M45
1.5	47	4	8	2	355	2 1/8	M52
1.5	51	5	12	2	395	2 1/8	M52
2.4	55	6	12	2 1/2	510	2 5/8	M64
2.4	60	8	12	2 3/4	560	2 7/8	M72

Disclaimer – Please check with ASME B16.5 Before using.