main dimensions
JIS B2220 30K flanges

short JIS menu

JIS Flanges General

JIS 5K B2220

JIS 10K B2220

JIS 16K B2220

JIS 20K B2220

JIS 30K B2220

Threaded flange (RF)

Socket Weld flange (FF)

Weld Neck flange (RF)

Slip On flange (FF)

Lap Joint flange

Blind flange (RF)

JIS flange dimension chart

NPS MM IN		OD	T	T1	L	L1	D	PCD	BH#	BHØ
10	3/8	110	16	16	24	N/A	10	75	4	19
15	1/2	115	18	18	26	45	10	80	4	19
20	3/4	120	18	18	28	45	13	85	4	19
25	1	130	20	20	30	48	13	95	4	19
32	1 1/4	140	22	22	32	52	13	105	4	19
40	1 1/2	160	22	22	34	54	13	120	4	23
50	2	165	22	22	36	57	16	130	8	19
65	2 1/2	200	26	26	40	69	16	160	8	23
80	3	210	28	28	44	73	16	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
D = Depth of Socket Weld flange
PCD = Pitch Circle Diameter
BH# = Bolt Hole numbers
BHØ = Bolt Hole diameter
The JIS tapered thread is comparable to the BSPT connection in terms of design, appearance, and dimensions; both are interchangeable.
X and X1 dimensions see JIS pipes

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	G	B
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.

main dimensions JIS B2220 30K flanges

JIS flange dimension chart

Flange Facing Dimensions in MM

main dimensions
JIS B2220 30K flanges