Dimensions
JIS B2220 5K 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	75	9	9	13	24	55	4	12
15	1/2	80	9	9	13	25	60	4	12
20	3/4	85	10	10	15	28	65	4	12
25	1	95	10	10	17	30	75	4	12
32	1 1/4	115	12	12	19	33	90	4	15
40	1 1/2	120	12	12	20	34	95	4	15
50	2	130	14	14	24	38	105	4	15
65	2 1/2	155	14	14	27	39	130	4	15
80	3	180	14	14	30	41	145	4	19
90	3 1/2	190	14	14		41	155	4	19
100	4	200	16	16	36	41	165	8	19
125	5	235	16	16	40	43	200	8	19
150	6	265	18	18	40	49	230	8	19
175	7	300	18	18	N/A	49	260	8	23
200	8	320	20	20	N/A	53	280	8	23
225	9	345	20	20	N/A	54	305	12	23
250	10	385	22	22	N/A	61	345	12	23
300	12	430	22	22	N/A	64	390	12	23
350	14	480	24	24	N/A	73	435	12	25
400	16	540	24	24	N/A	76	495	16	25
450	18	605	24	24	40	79	555	16	25
500	20	655	24	24	40	79	605	20	25
550	22	720	26	26	42	81	665	20	27
600	24	770	26	26	44	81	715	20	27
650	26	825	26	28	48	85	770	24	27
700	28	875	28	30	48	94	820	24	27
750	30	945	28	32	52	100	880	24	33
800	32	995	28	34	52	100	930	24	33
850	34	1045	28	36	54	108	980	24	33
900	36	1095	30	36	56	108	1030	24	33
1000	40	1195	32	40	60	116	1130	28	33

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 5K flanges

Flange Facing Dimensions in MM

Dimensions
JIS B2220 5K flanges