Dimensions
JIS B2220 30K 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	110	16	16	24	N/A	75	4	19
15	1/2	115	18	18	26	45	80	4	19
20	3/4	120	18	18	28	45	85	4	19
25	1	130	20	20	30	48	95	4	19
32	1 1/4	140	22	22	32	52	105	4	19
40	1 1/2	160	22	22	34	54	120	4	23
50	2	165	22	22	36	57	130	8	19
65	2 1/2	200	26	26	40	69	160	8	23
80	3	210	28	28	44	73	170	8	23
90	3 1/2	230	30	30	46	74	185	8	25
100	4	240	32	32	48	76	195	8	25
125	5	275	36	36	54	86	230	8	25
150	6	325	38	38	58	95	275	12	27
200	8	370	42	42	64	102	320	12	27
250	10	450	48	48	72	118	390	12	33
300	12	515	52	52	78	127	450	16	33
350	14	560	54	54	84	134	495	16	33
400	16	630	60	60	92	149	560	16	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 30K flanges

Flange Facing Dimensions in MM

Dimensions
JIS B2220 30K flanges