Dimensions
JIS B2220 10K flanges

Updated May 2026

JIS 5K B2220

JIS 10K B2220

JIS 16K B2220

JIS 20K B2220

JIS 30K B2220

Weld Neck (RF)

Slip On (FF)

Socket Weld (FF)

Lap Joint

Blind (FF)

NPS MM IN		OD	T	T1	L	L1	PCD	BH#	BHØ
10	3/8	90	12	12	16	29	65	4	15
15	1/2	95	12	12	16	31	70	4	15
20	3/4	100	14	14	20	32	75	4	15
25	1	110	14	14	20	35	90	4	19
32	1 1/4	135	16	16	22	38	100	4	19
40	1 1/2	140	18	16	24	38	105	4	19
50	2	155	18	16	24	40	120	4	19
65	2 1/2	175	18	18	27	44	140	4	19
80	3	185	18	18	30	45	150	8	19
90	3 1/2	195	18	18	N/A	45	160	8	19
100	4	210	18	18	32	45	175	8	19
125	5	230	20	20	40	47	210	8	23
150	6	280	22	22	40	53	240	8	23
175	7	300	22	22	N/A	54	270	8	23
200	8	330	22	22	N/A	58	290	12	23
225	9	350	22	22	N/A	59	310	12	25
250	10	400	24	24	36	65	355	12	25
300	12	445	24	24	38	73	410	12	25
350	14	490	26	26	42	75	445	16	25
400	16	520	28	28	44	79	515	16	27
450	18	570	30	30	48	84	565	20	27
500	20	575	30	30	48	90	620	20	27
550	22	745	32	34	52	111	675	24	33
600	24	735	32	36	52	112	730	24	33
650	26	845	34	38	56	115	780	24	33
700	28	905	34	40	58	132	840	24	33
750	30	970	36	44	62	139	900	24	33
800	32	1020	36	46	64	139	950	24	33
850	34	1070	36	48	66	139	1000	28	33
900	36	1120	38	50	70	140	1050	28	33
1000	40	1235	40	56	74	151	1160	28	39

Notes..

Dimensions are in millimeters unless otherwise indicated
NPS = Nominal Pipe Size
OD = Outside Diameter of flange
T = Thickness min of all flanges
T1 = Thickness min of blind flange
L = Height of Slip On, Socket Weld and Lap Joint flange
L1 = Height of Weld Neck flange
PCD = Pitch Circle Diameter
BH# = Bolt Hole numbers
BHØ = Bolt Hole diameter
D = Depth of Socket Weld flange (currently unavailable)
Threaded flanges are currently not available

Flange Facing Dimensions in MM

Raised Face design

Flat Face design

NPS	RF large										RF small
	5K		10K		16K		20K		30K		RF small
	G	B	G	B	G	B	G	B	G	B	G1	B1
10	39	1	46	1	46	1	46	1	52	1	35	1
15	44	1	51	1	51	1	51	1	55	1	42	1
20	49	1	56	1	56	1	56	1	60	1	50	1
25	59	1	67	1	67	1	67	1	70	1	60	1
32	70	2	76	2	76	2	76	2	80	2	68	2
40	75	2	81	2	81	2	81	2	90	2	75	2
50	85	2	96	2	96	2	96	2	105	2	90	2
65	110	2	116	2	116	2	116	2	130	2	105	2
80	121	2	126	2	132	2	132	2	140	2	120	2
90	131	2	136	2	145	2	145	2	150	2	130	2
100	141	2	151	2	160	2	160	2	160	2	145	2
125	176	2	182	2	195	2	195	2	195	2	170	2
150	206	2	212	2	230	2	230	2	235	2	205	2
175	232	2	237	2
200	252	2	262	2	275	2	275	2	280	2	260	2
225	277	2	282	2
250	317	2	324	2	345	2	345	2	345	2	315	2
300	360	3	368	3	395	3	395	3	405	3	375	3
350	403	3	413	3	440	3	440	3	450	3	415	3
400	463	3	475	3	495	3	495	3	510	3	465	3
450	523	3	530	3	560	3	560	3
500	573	3	585	3	615	3	615	3
550	630	3	640	3	670	3	670	3
600	380	3	690	3	720	3	720	3
650	735	3	740	3	770	5	790	5
700	785	3	800	3	820	5	840	5
750	840	3	855	3	880	5	900	5
800	890	3	905	3	930	5	960	5
850	940	3	955	3	980	5	1020	5
900	990	3	1005	3	1030	5	1070	5
1000	1090	3	1110	3	1140	5

Raised Face (RF) JIS flange
is a pipe flange conforming to the Japanese industrial standard (JIS B2220) in which the gasket surface is positioned higher than the plane of the bolt circle. This design concentrates the bolt pressure on a smaller gasket surface, resulting in a stronger, tighter, and more reliable leak-free seal.

Flat Face (FF) JIS flange
is a pipe flange that conforms to the Japanese Industrial Standard (JIS) and has a completely smooth, flat sealing surface. Unlike raised surface (RF) flanges, they use gaskets that cover the entire flange surface, from the inner bore to the outer bolt circle.

Dimensions JIS B2220 10K flanges

Flange Facing Dimensions in MM

Dimensions
JIS B2220 10K flanges