JIS B2220 — 20K Flange Dimensions

Name: JIS B2220 20K Flange Dimensions
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JIS B2220 20K Flange Dimensions — 28 sizes.

Size — A	A — Pipe OD (mm)	D — Flange OD (mm)	C — Flange (mm)	d1 — Raised face (mm)	K — Bolt circle (mm)	n — Bolts	L — Hole dia (mm)	Bolt — Size
10	17.3	90	14	46	65	4	15	M12
15	21.7	95	14	51	70	4	15	M12
20	27.2	100	16	56	75	4	15	M12
25	34	125	16	67	90	4	19	M16
32	42.7	135	18	76	100	4	19	M16
40	48.6	140	18	81	105	4	19	M16
50	60.5	155	18	96	120	8	19	M16
65	76.3	175	20	116	140	8	19	M16
80	89.1	200	22	132	160	8	23	M20
(90)	101.6	210	24	145	170	8	23	M20
100	114.3	225	24	160	185	8	23	M20
125	139.8	270	26	195	225	8	25	M22
150	165.2	305	28	230	260	12	25	M22
200	216.3	350	30	275	305	12	25	M22
250	267.4	430	34	345	380	12	27	M24
300	318.5	480	36	395	430	16	27	M24
350	355.6	540	40	440	480	16	33	M30×3
400	406.4	605	46	495	540	16	33	M30×3
450	457.2	675	48	560	605	20	33	M30×3
500	508	730	50	615	660	20	33	M30×3
(550)	558.8	795	52	670	720	20	39	M36×3
600	609.6	845	54(56)	720	770	24	39	M36×3
650	660.4	945	60	790	850	24	48	M45×3
700	711.2	995	64	840	900	24	48	M45×3
750	762	1080	68	900	970	24	56	M52×3
800	812.8	1140	72	960	1030	24	56	M52×3
850	863.6	1200	74	1020	1090	24	56	M52×3
900	914.4	1250	76	1070	1140	28	56	M52×3

All dimensions are in millimetres. Nominal size is the JIS 'A' size (e.g. 100A = DN 100).
Thickness values in parentheses apply to blind flanges.
Values are nominal, compiled from published copies of the standard; blank cells (—) are values not confirmed from the sources available. Verify against the current edition before design, purchase or fabrication.