Class 300 Flange Dimensions

Class 300 flange dimentions and bolt circles are as per ASME/ANSI B16.5 or ASME/ANSI 16.47. The dimensions are for end connection of class 300 ball valve and other steel valves.

ANSI Class 300 flange dimensions

ANSI Class 300 Flange Dimensions (RF Ends)

Size		O		R	C			T		h		Bolt
inch	mm	inch	mm	inch	mm	inch	mm	inch	mm	inch	mm	Qty	Diameter
2	50	6.50	165	3.62	92	0.88	23	5.00	127	0.75	19	8	5/8
2 1/2	65	7.50	190	4.12	105	1.00	26	5.88	149	0.88	22	8	3/4
3	80	8.25	210	5.00	127	1.12	29	6.62	168.5	0.88	22	8	3/4
4	100	10.00	254	6.19	157	1.25	32	7.88	200	0.88	22	8	3/4
6	150	12.50	318	8.50	216	1.44	37	10.62	270	0.88	22	12	3/4
8	200	15.00	381	10.62	270	1.62	42	13.00	330	1.00	25	12	7/8
10	250	17.50	445	12.75	324	1.88	48	15.25	387.5	1.12	29	16	1
12	300	20.50	521	15.00	381	2.00	51	17.75	451	1.25	32	16	1 1/8
14	350	23.00	584	16.25	413	2.12	54	20.25	514.5	1.25	32	20	1 1/8
16	400	25.50	648	18.50	470	2.25	58	22.50	571.5	1.38	35	20	1 1/4
18	450	28.00	711	21.00	533	2.38	61	24.75	628.5	1.38	35	24	1 1/4
20	500	30.50	775	23.00	584	2.50	64	27.00	686	1.38	35	24	1 1/4
24	600	36.00	914	27.25	692	2.75	70	32.00	813	1.62	41	24	1 1/2
26	650	38.25	972	29.50	749	3.12	80	34.50	876.5	1.75	45	28	1 5/8
28	700	40.75	1035	31.50	800	3.38	86	37.00	940	1.75	45	28	1 5/8
30	750	43.00	1092	33.75	857	3.62	92	39.25	997	1.88	48	28	1 3/4
32	800	45.25	1149	36.00	914	3.88	98	41.50	1054	2.00	51	28	17/8
36	900	50.00	1270	40.25	1022	4.12	105	46.00	1168.5	2.12	54	32	2

ANSI Class 300 flange dimensions (RTJ)

ANSI Class 300 Flange Dimensions (RTJ Ends)

SIZE		Ring No.	P		E		F		R		K
inch	mm	inch	inch	mm	inch	mm	inch	mm	inch	mm	inch	mm
2	50	R23	3.250	82.55	0.312	7.92	0.469	11.91	0.03	0.8	4.25	108
2 1/2	65	R26	4.000	101.60	0.312	7.92	0.469	11.91	0.03	0.8	5.00	127
3	80	R31	4.875	123.82	0.312	7.92	0.469	11.91	0.03	0.8	5.75	146
4	100	R37	5.875	149.22	0.312	7.92	0.469	11.91	0.03	0.8	6.88	175
6	150	R45	8.312	211.13	0.312	7.92	0.469	11.91	0.03	0.8	9.50	241
8	200	R49	10.625	269.88	0.312	7.92	0.469	11.91	0.03	0.8	11.88	302
10	250	R53	12.750	323.85	0.312	7.92	0.469	11.91	0.03	0.8	14.00	356
12	300	R57	15.000	381.00	0.312	7.92	0.469	11.91	0.03	0.8	16.25	413
14	350	R61	16.500	419.10	0.312	7.92	0.469	11.91	0.03	0.8	18.00	457
16	400	R65	18.500	469.90	0.312	7.92	0.469	11.91	0.03	0.8	20.00	508
18	450	R69	21.000	533.40	0.312	7.92	0.469	11.91	0.03	0.8	22.62	575
20	500	R73	23.000	584.20	0.375	9.52	0.531	13.49	0.06	1.5	25.00	635
24	600	R77	27.250	692.15	0.438	11.13	0.656	16.66	0.06	1.5	29.50	749
26	650	R93	29.500	749.30	0.500	12.7	0.781	19.84	0.06	1.5	31.88	861
28	700	R94	31.500	800.10	0.500	12.7	0.781	19.84	0.06	1.5	33.88	861
30	750	R95	33.750	857.25	0.500	12.7	0.781	19.84	0.06	1.5	36.12	917
32	800	R96	36.000	914.40	0.562	14.27	0.906	23.01	0.06	1.5	38.75	984
36	900	R98	40.250	1022.35	0.562	14.27	0.906	23.01	0.06	1.5	43.00	1092