JIS B2311 Butt-welding Fitting

JIS B2311 Buttweld Pipe Fittings Dimensions

45-Degree Elbow Dimensions Chart (in lbs)

NPS	O.D. D	90 deg LR Center-to-End A	45 deg Long Radius Center-to-End B	90 deg 3D Center-to-End A	45 deg 3D Center-to-End B
1/2	21.3	38	16	–	–
3/4	26.7	38	19	57	24
1	33.4	38	22	76	31
1¼	42.2	48	25	95	39
1½	48.3	57	29	114	47
2	60.3	76	35	152	63
2½	73	95	44	190	79
3	88.9	114	51	229	95
3½	101.6	133	57	267	111
4	114.3	152	64	305	127
5	141.3	190	79	381	157
6	168.3	229	95	457	189
8	219.1	305	127	610	252
10	273	381	159	762	316
12	323.8	457	190	914	378
14	355.6	533	222	1067	441
16	406.4	610	254	1219	505
18	457	686	286	1372	568
20	508	762	318	1524	632
22	559	838	343	1676	694
24	610	914	381	1829	757
26	660	991	406	1981	821
28	711	1067	438	2134	883
30	762	1143	470	2286	964
32	813	1219	502	2438	1010
34	864	1295	533	2591	1073
36	914	1372	565	2743	1135
38	965	1448	600	2896	1200
40	1016	1524	632	3048	1264
42	1067	1600	660	3200	1326
44	1118	1676	695	3353	1389
46	1168	1753	727	3505	1453
48	1219	1829	759	3658	1516

90 Degree Elbow Dimensions Chart (in lbs)

Inch.	ND	millimeter	Center to center	Radius	Center to end	Back to face
D			O	A	B	K
1/2	15	21,34	76,20	38,10	15,87	47,62
3/4	20	26,67	57,15	28,57	11,11	42,86
1	25	33,40	76,20	38,10	22,22	55,56
1 1/4	32	42,16	95,25	47,60	25,40	69,85
1 1/2	40	48,26	114,30	57,15	28,57	82,55
2	50	60,32	152,40	76,20	34,92	106,40
2 1/2	65	73,02	190,50	95,25	44,45	131,80
3	80	88,90	228,60	114,30	50,80	158,75
3 1/2	90	101,60	266,70	133,35	57,15	184,15
4	100	114,30	304,80	152,40	63,50	209,55
5	125	141,30	381,00	190,50	79,38	261,90
6	150	168,27	457,20	228,60	95,25	312,70
8	200	219,07	609,60	304,80	127,00	414,30
10	250	273,05	762,00	381,00	158,75	517,50
12	300	323,85	914,40	457,20	190,50	619,10
14	350	355,60	1066,80	533,40	222,25	711,20
16	400	406,40	1219,20	609,60	254,00	812,80
18	450	457,20	1371,60	685,80	285,74	914,40
20	500	508,00	1524,00	762,00	317,50	1016,00
22	550	558,80	1676,40	838,20	342,90	1117,60
24	600	609,60	1828,80	914,40	381,00	1219,20
28	700	711,20	2133,60	1066,80	441,90	1422,40

180 Degree Elbow Dimensions Chart (in lbs)

Normal Pipe Size	Outside Daimeter D	ASME 180 degree Long Rad		ASME 180 degree Short Rad
		Center to Center O	Back to Face K	Center to Center O	Back to Face K
1/2	21.3	76	48	…	…
3/4	26.7	76	51	…	…
1	33.4	76	56	51	41
1.1/4	42.2	95	70	64	52
1.1/2	48.3	114	83	76	62
2	60.3	152	106	102	81
2.1/2	73	190	132	127	100
3	88.9	229	159	152	121
3.1/2	101.6	267	184	178	140
4	114.3	305	210	203	159
5	141.3	381	262	254	197
6	168.3	457	313	305	237
8	219.1	610	414	406	313
10	273	762	518	508	391
12	323.8	914	619	610	467
14	355.6	1067	711	711	533
16	406.4	1219	813	813	610
18	457	1372	914	914	686
20	508	1524	1016	1016	762
22	559	1676	1118	1118	838
24	610	1829	1219	1219	914
Normal Pipe Size	Outside Daimeter D	180 degree Long Rad		180 degree Short Rad
		Center to Center O	Back to Face K	Center to Center O	Back to Face K

Straight / Equal Tee Dimensions Chart (in lbs)

NOMINAL PIPE SIZE	OUTSIDE DIAMETER	CENTER TO END	LENGTH
Inch.	OD	C	M
1/2	21.3	25	25
3/4	26.7	29	29
1	33.4	38	38
1 1/4	42.2	48	48
1 1/2	48.3	57	57
2	60.3	64	64
2 1/2	73	76	76
3	88.9	86	86
3 1/2	101.6	95	95
4	114.3	105	105
5	141.3	124	124
6	168.3	143	143
8	219.1	178	178
10	273.1	216	216
12	323.9	254	254
14	355.6	279	279
16	406.4	305	305
18	457.2	343	343
20	508	381	381
22	559	419	419
24	610	432	432
26	660	495	495
28	711	521	521
30	762	559	559
32	813	597	597
34	864	635	635
36	914	673	673
38	965	711	711
40	1016	749	749
42	1067	762	711
44	1118	813	762
46	1168	851	800
48	1219	889	838

Reducing Tee Dimensions Chart (in lbs)

NOMINAL PIPE SIZE	OUTSIDE DIAMETER		CENTER TO END
Inch	D	P	C	M
1/2 x 3/8	21.3	17.1	25	25
1/2 x 1/4	21.3	13.7	25	25
3/4 x 1/2	26.7	21.3	29	29
3/4 x 3/8	26.7	17.1	29	29
1 x 3/4	33.4	26.7	38	38
1 x 1/2	33.4	21.3	38	38
1 1/4 x 1	42.2	33.4	48	48
1 1/4 x 3/4	42.2	26.7	48	48
1 1/4 x 1/2	42.2	21.3	48	48
1 1/2 x 1 1/2	48.3	42.2	57	57
1 1/2 x 1	48.3	33.4	57	57
1 1/2 x 3/4	48.3	26.7	57	57
1 1/2 x 1/2	48.3	21.3	57	57
2 x 1 1/2	60.3	48.2	64	60
2 x 1 1/4	60.3	42.2	64	57
2 x 1	60.3	33.4	64	51
2 x 3/4	60.3	26.7	64	44
2 1/2 x 2	73	60.3	76	70
2 1/2 x 1 1/2	73	48.3	76	67
2 1/2 x 1 1/4	73	42.2	76	64
2 1/2 x 1	73	33.4	76	57
3 x 2 1/2	88.9	73	86	83
3 x 2	88.9	60.3	86	76
3 x 1 1/2	88.9	48.3	86	73
3 x 1 1/4	88.9	42.2	86	70
3 1/2 x 3	101.6	88.9	95	92
3 1/2 x 21/2	101.6	73	95	89
3 1/2 x 2	101.6	60.3	95	83
3 1/2 x 1 1/2	101.6	48.3	95	79
4 x 3 1/2	114.3	101.6	105	102
4 x 3	114.3	88.9	105	98
4 x 2 1/2	114.3	73	105	95
4 x 2	114.3	60.3	105	89
4 x 1 1/2	114.3	48.3	105	86
5 x 4	141.3	114.3	124	117
5 x 3 1/2	141.3	101.6	124	114
5 x 3	141.3	88.9	124	111
5 x 2 1/2	141.3	73	124	108
5 x 2	141.3	60.3	124	105
6 x 5	168.3	141.3	143	137
6 x 4	168.3	114.3	143	130
6 x 3 1/2	168.3	101.6	143	127
6 x 3	168.3	88.9	143	124
6 x 2 1/2	168.3	73	143	121
8 x 6	219.1	168.3	178	168
8 x 5	219.1	141.3	178	162
8 x 4	219.1	114.3	178	156
8 x 3 1/2	219.1	101.6	178	152
10 x 8	273.1	219.1	216	203
10 x 6	273.1	168.1	216	194
10 x 5	273.1	141.3	216	191
10 x 4	273.1	114.3	216	184
12 x 10	323.9	273.1	254	241
12 x 8	323.9	219.1	254	229
12 x 6	323.9	168.3	254	219
12 x 5	323.9	141.3	254	216
14 x 12	355.6	323.9	279	270
14 x 10	355.6	273.1	279	257
14 x 8	355.6	219.1	279	248
14 x 6	355.6	168.3	279	238
16 x 14	406.4	355.6	305	305
16 x 12	406.4	323.9	305	295
16 x 10	406.4	273.1	305	283
16 x 8	406.4	219.1	305	273
16 x 6	406.4	168.3	305	264
18 x 16	457	406.4	343	330
18 x 14	457	355.6	343	330
18 x 12	457	323.9	343	321
18 x 10	457	273.1	343	308
18 x 8	457	219.1	343	298
20 x 18	508	457	381	368
20 x 16	508	406.4	381	356
20 x 14	508	355.6	381	356
20 x 12	508	323.9	381	346
20 x 10	508	273.1	381	333
20 x 8	508	219.1	381	324
22 x 20	559	508	419	406
22 x 18	559	457	419	394
22 x 16	559	406.4	419	381
22 x 14	559	355.6	419	381
22 x 12	559	323.9	419	371
24 x 10	559	273.1	419	359
24 x 22	610	559	432	432
24 x 20	610	508	432	432
24 x 18	610	457	432	419
24 x 16	610	406.4	432	406
24 x 14	610	355.6	432	406
24 x 12	610	323.9	432	397
24 x 10	610	273.1	432	384

Concentric and Eccentric Reducer Dimensions Chart (in lbs)

NOMINAL PIPE SIZE	OUTSIDE DIAMETER		END TO END
Inch	D	P	H
3/4 x 1/2	26.7	21.3	38
3/4 x 3/8	26.7	17.1	38
1 x 3/4	33.4	26.7	51
1 x 1/2	33.4	21.3	51
1 1/4 x 1	42.2	33.4	51
1 1/4 x 3/4	42.2	26.7	51
1 1/4 x 1/2	42.2	21.3	51
1 1/2 x 1 1/2	48.3	42.2	64
1 1/2 x 1	48.3	33.4	64
1 1/2 x 3/4	48.3	26.7	64
1 1/2 x 1/2	48.3	21.3	64
2 x 1 1/2	60.3	48.2	76
2 x 1 1/4	60.3	42.2	76
2 x 1	60.3	33.4	76
2 x 3/4	60.3	26.7	76
2 1/2 x 2	73	60.3	89
2 1/2 x 1 1/2	73	48.3	89
2 1/2 x 1 1/4	73	42.2	89
2 1/2 x 1	73	33.4	89
3 x 2 1/2	88.9	73	89
3 x 2	88.9	60.3	89
3 x 1 1/2	88.9	48.3	89
3 x 1 1/4	88.9	42.2	89
3 1/2 x 3	101.6	88.9	102
3 1/2 x 21/2	101.6	73	102
3 1/2 x 2	101.6	60.3	102
3 1/2 x 1 1/2	101.6	48.3	102
3 1/2 x 1 1/4	101.6	42.2	102
4 x 3 1/2	114.3	101.6	102
4 x 3	114.3	88.9	102
4 x 2 1/2	114.3	73	102
4 x 2	114.3	60.3	102
4 x 1 1/2	114.3	48.3	102
5 x 4	141.3	114.3	127
5 x 3 1/2	141.3	101.6	127
5 x 3	141.3	88.9	127
5 x 2 1/2	141.3	73	127
5 x 2	141.3	60.3	127
6 x 5	168.3	141.3	140
6 x 4	168.3	114.3	140
6 x 3 1/2	168.3	101.6	140
6 x 3	168.3	88.9	140
6 x 2 1/2	168.3	73	140
8 x 6	219.1	168.3	152
8 x 5	219.1	141.3	152
8 x 4	219.1	114.3	152
8 x 3 1/2	219.1	101.6	152
10 x 8	273.1	219.1	178
10 x 6	273.1	168.1	178
10 x 5	273.1	141.3	178
10 x 4	273.1	114.3	178
12 x 10	323.9	273.1	203
12 x 8	323.9	219.1	203
12 x 6	323.9	168.3	203
12 x 5	323.9	141.3	203
14 x 12	355.6	323.9	330
14 x 10	355.6	273.1	330
14 x 8	355.6	219.1	330
14 x 6	355.6	168.3	330
16 x 14	406.4	355.6	356
16 x 12	406.4	323.9	356
16 x 10	406.4	273.1	356
16 x 8	406.4	219.1	356
16 x 6	406.4	168.3	356
18 x 16	457	406.4	381
18 x 14	457	355.6	381
18 x 12	457	323.9	381
18 x 10	457	273.1	381
18 x 8	457	219.1	381
20 x 18	508	457	508
20 x 16	508	406.4	508
20 x 14	508	355.6	508
20 x 12	508	323.9	508
20 x 10	508	273.1	508
20 x 8	508	219.1	508
22 x 20	559	508	508
22 x 18	559	457	508
22 x 16	559	406.4	508
22 x 14	559	355.6	508
22 x 12	559	323.9	508
24 x 10	559	273.1	508
24 x 22	610	559	508
24 x 20	610	508	508
24 x 18	610	457	508
24 x 16	610	406.4	508
24 x 14	610	355.6	508
24 x 12	610	323.9	508
24 x 10	610	273.1	508

End Cap Dimension Chart (in lbs)

Inch.	MM		Height
		D	E
1/2	15	21,34	25,40
3/4	20	26,67	31,75
	25	33,40	38,10
1 1/4	32	42,16	38,10
1 1/2	40	48,26	38,10
2	50	60,32	38,10
2 1/2	65	73,02	38,10
3	80	88,90	50,80
3 1/2	90	101,60	63,50
4	100	114,30	63,50
5	125	141,30	76,20
6	150	168,27	88,90
8	200	219,07	101,60
10	250	273,05	127,00
12	300	323,85	152,40
14	350	355,60	165,10
16	400	406,40	177,80
18	450	457,20	203,20
20	500	508,00	228,60
22	550	558,80	254,00
24	600	609,60	266,70
28	700	711,20	266,70

Stub End Dimensions Chart (in lbs)

NOMINAL PIPE SIZE	LAP DIAMETER	OUTSIDE DIAMETER		LONG PATTERN LENGTH	SHORT PATTERN LENGTH	RADIUS
Inch.	A	OD Min	OD Max	L	L	R
1/2	35	22.8	20.5	76	51	3
3/4	43	28.1	25.9	76	51	3
1	51	35	32.6	102	51	3
1 1/4	64	43.6	41.4	102	51	5
1 1/2	73	49.9	47.5	102	51	6
2	92	62.4	59.5	152	64	8
2 1/2	105	75.3	72.2	152	64	8
3	127	91.3	88.1	152	64	10
3 1/2	140	104	100.8	152	76	10
4	157	116.7	113.5	152	76	11
5	186	144.3	140.5	203	76	11
6	216	171.3	167.5	203	89	13
8	270	222.1	218.3	203	102	13
10	324	277.2	272.3	254	127	13
12	381	328	323.1	254	152	13
14	413	359.9	354.8	305	152	13
16	470	411	405.6	305	152	13
18	533	462	456	305	152	13
20	584	514	507	305	152	13
22	641	565	558	305	152	13
24	692	616	609	305	152	13

Tolerance

While specific numeric values for tolerances vary depending on the flange size (such as Class 10K, 16K, 30K, etc.) and the type of material, the general approach to tolerances in JIS B2311 follows these guidelines:

For flanges with a diameter smaller than 600 mm (approx. 24 inches):

1. Diameter tolerances can be around ±0.5 mm.
2. Tolerances for bolt hole diameters could be ±0.1 mm.
3. Thickness tolerance may be around ±0.5 mm.

For larger flanges (over 600 mm or 24 inches):
1. Larger flanges may have slightly broader tolerances, often specified as ±1.0 mm or ±1.5 mm, depending on the size.

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JIS B2311 Buttweld Pipe Fittings Dimensions

45-Degree Elbow Dimensions Chart (in lbs)

90 Degree Elbow Dimensions Chart (in lbs)

180 Degree Elbow Dimensions Chart (in lbs)

Straight / Equal Tee Dimensions Chart (in lbs)

Reducing Tee Dimensions Chart (in lbs)

Concentric and Eccentric Reducer Dimensions Chart (in lbs)

End Cap Dimension Chart (in lbs)

Stub End Dimensions Chart (in lbs)

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Tolerance

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