Exploring Buttweld Fittings: Types and Applications

 

NPS	O.D.D	90° LRA	45° LRB	90° 3DA	45° 3DB
1/2	21.3	38	16
3/4	26.7	38	19	57	24
1	33.4	38	22	76	31
1.1/4	42.2	48	25	95	39
1.1/2	48.3	57	29	114	47
2	60.3	76	35	152	63
2.1/2	73	95	44	190	79
3	88.9	114	51	229	95
3.1/2	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	946
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

Dimensions are in millimeters unless otherwise indicated. Wall thickness
Dimensional Tolerances of Butt Weld Elbows 45° & 90° LR & 3D ASME B16.9

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4	5 to 8
Outside Diameterat Bevel (D)	+ 1.6– 0.8	1.6	1.6	+ 2.4– 1.6
Inside Diameter at End	0.8	1.6	1.6	1.6
Center to End LR (A/B)	2	2	2	2
Center to End 3D (A/B)	3	3	3	3
Nominal Pipe Size	10 to 18	20 to 24	26 to 30	32 to 48
Outside Diameterat Bevel (D)	+ 4– 3.2	+ 6.4– 4.8	+ 6.4– 4.8	+ 6.4– 4.8
Inside Diameter at End	3.2	4.8	+ 6.4– 4.8	+ 6.4– 4.8
Center to End LR (A/B)	2	2	3	5
Center to End 3D (A/B)	3	3	6	6
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Dimensions Butt Weld Elbows

45°-90° LR and 3D ASME B16.9

NPS	O.D.D	90° LRA	45° LRB	90° 3DA	45° 3DB
1/2	21.3	38	16
3/4	26.7	38	19	57	24
1	33.4	38	22	76	31
1.1/4	42.2	48	25	95	39
1.1/2	48.3	57	29	114	47
2	60.3	76	35	152	63
2.1/2	73	95	44	190	79
3	88.9	114	51	229	95
3.1/2	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	946
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

Dimensions are in millimeters unless otherwise indicated. Wall thickness Dimensional Tolerances of Butt Weld Elbows 45° & 90° LR & 3D ASME B16.9

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4	5 to 8
Outside Diameterat Bevel (D)	+ 1.6– 0.8	1.6	1.6	+ 2.4– 1.6
Inside Diameter at End	0.8	1.6	1.6	1.6
Center to End LR (A/B)	2	2	2	2
Center to End 3D (A/B)	3	3	3	3
Nominal Pipe Size	10 to 18	20 to 24	26 to 30	32 to 48
Outside Diameterat Bevel (D)	+ 4– 3.2	+ 6.4– 4.8	+ 6.4– 4.8	+ 6.4– 4.8
Inside Diameter at End	3.2	4.8	+ 6.4– 4.8	+ 6.4– 4.8
Center to End LR (A/B)	2	2	3	5
Center to End 3D (A/B)	3	3	6	6
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Butt Weld Elbows 90°-SR- ASME B16.9

NPS	O.D.D	cteA	NPS	O.D.D	cteA
1	33.4	25	8	219.1	203
1.1/4	42.2	32	10	273	254
1.1/2	48.3	38	12	323.8	305
2	60.3	51	14	355.6	356
2.1/2	73	64	16	406.4	406
3	88.9	76	18	457	457
3.1/2	101.6	89	20	508	508
4	114.3	102	22	559	559
5	141.3	127	24	610	610
6	168.3	152	–	–	–

Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer. *cte means Center to End dimensions. Dimensional Tolerances of Butt Weld Elbows Short Radius 90° ASME B16.9

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4	5 to 8
Outside Diameterat Bevel (D)	+ 1.6– 0.8	1.6	1.6	+ 2.4– 1.6
Inside Diameter at End	0.8	1.6	1.6	1.6
cte (A)	2	2	2	2
Nominal Pipe Size	10 to 18	20 to 24	26 to 30	32 to 48
Outside Diameterat Bevel (D)	+ 4– 3.2	+ 6.4– 4.8	+ 6.4– 4.8	+ 6.4– 4.8
Inside Diameter at End	3.2	4.8	+ 6.4– 4.8	+ 6.4– 4.8
cte (A)	2	2	3	5
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Butt Weld Elbows 180° LR & SR ASME B16.9

NPS	O.D. D	180° LR		180° SR
		Center to Center O	Back toFace K	Center to Center O	Back toFace 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

Dimensions are in millimeters unless otherwise indicated.Wall thickness (t) must be specified by customer. Dimensional Tolerances of Butt Weld Elbows 180° LR & SR ASME B16.9

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4
Outside Diameterat Bevel (D)	+ 1.6– 0.8	1.6	1.6
Inside Diameter at End	0.8	1.6	1.6
Center to Center (O)	6	6	6
Back to Face (K)	6	6	6
Nominal Pipe Size	5 to 8	10 to 18	20 to 24
Outside Diameterat Bevel (D)	+ 2.4– 1.6	+ 4– 3.2	+ 6.4– 4.8
Inside Diameter at End	1.6	3.2	4.8
Center to Center (O)	6	10	10
Back to Face (K)	6	6	6
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Butt Weld Elbows 180° LR & SR ASME B16.9

NPS	O.D. D	180° LR		180° SR
		Center to Center O	Back toFace K	Center to Center O	Back toFace 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

Dimensions are in millimeters unless otherwise indicated.Wall thickness (t) must be specified by customer. Dimensional Tolerances of Butt Weld Elbows 180° LR & SR ASME B16.9

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4
Outside Diameterat Bevel (D)	+ 1.6– 0.8	1.6	1.6
Inside Diameter at End	0.8	1.6	1.6
Center to Center (O)	6	6	6
Back to Face (K)	6	6	6
Nominal Pipe Size	5 to 8	10 to 18	20 to 24
Outside Diameterat Bevel (D)	+ 2.4– 1.6	+ 4– 3.2	+ 6.4– 4.8
Inside Diameter at End	1.6	3.2	4.8
Center to Center (O)	6	10	10
Back to Face (K)	6	6	6
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Dimensions Butt Weld Straight Tees ASME B16.9

NPS	O.D.D	Center to EndC	Center to EndM
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	216	216
12	323.8	254	254
14	355.6	279	279
16	406.4	305	305
18	457	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

Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer. Outlet dimension (M) for NPS 26 and larger is recommended but not required. Dimensional Tolerances Straight Tees ASME B16.9

Nominal Pipe Size	1/2to2.1/2	3to3.1/2	4	5to8	10to18	20to24	26to30	32to48
Outside Diaat Bevel (D)	+1.6-0.8	1.6	1.6	+2.4-1.6	+4-3.2	+6.4-4.8	+6.4-4.8	+6.4-4.8
Inside Dia at End	0.8	1.6	1.6	1.6	3.2	4.8	+6.4-4.8	+6.4-4.8
Center to End (C / M)	2	2	2	2	2	2	3	5
Wall Thk (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Dimensions Butt Weld

Straight Tees ASME B16.9

NPS	O.D.D	Center to EndC	Center to EndM
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	216	216
12	323.8	254	254
14	355.6	279	279
16	406.4	305	305
18	457	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

Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer. Outlet dimension (M) for NPS 26 and larger is recommended but not required. Dimensional Tolerances Straight Tees ASME B16.9

Nominal Pipe Size	1/2to2.1/2	3to3.1/2	4	5to8	10to18	20to24	26to30	32to48
Outside Diaat Bevel (D)	+1.6-0.8	1.6	1.6	+2.4-1.6	+4-3.2	+6.4-4.8	+6.4-4.8	+6.4-4.8
Inside Dia at End	0.8	1.6	1.6	1.6	3.2	4.8	+6.4-4.8	+6.4-4.8
Center to End (C / M)	2	2	2	2	2	2	3	5
Wall Thk (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Butt Weld Reducers

Concentric and Eccentric ASME B16.9

NPS	O.D.D	O.D.D1	LengthH
3/4 – 1/2	26.7	21.3	38
1 – 1/2	33.4	21.3	51
1 – 3/4	33.4	26.7	51
1.1/4 – 1/2	42.2	21.3	51
1.1/4 – 3/4	42.2	26.7	51
1.1/4 – 1	42.2	33.4	51
1.1/2 – 1/2	48.3	21.3	64
1.1/2 – 3/4	48.3	26.7	64
1.1/2 – 1	48.3	33.4	64
1.1/2 – 1.1/4	48.3	42.2	64
2 – 3/4	60.3	26.7	76
2 – 1	60.3	33.4	76
2 – 1.1/4	60.3	42.2	76
2 – 1.1/2	60.3	48.3	76
2.1/2 – 1	73	33.4	89
2.1/2 – 1.1/4	73	42.2	89
2.1/2 – 1.1/2	73	48.3	89
2.1/2 – 2	73	60.3	89
3 – 1.1/4	88.9	42.2	89
3 – 1.1/2	88.9	48.3	89
3 – 2	88.9	60.3	89
3 – 2.1/2	88.9	73	89
3.1/2 – 1.1/4	101.6	42.2	102
3.1/2 – 1.1/2	101.6	48.3	102
3.1/2 – 2	101.6	60.3	102
3.1/2 – 2.1/2	101.6	73	102
3.1/2 – 3	101.6	88.9	102
4 – 1.1/2	114.3	48.3	102
4 – 2	114.3	60.3	102
4 – 2.1/2	114.3	73	102
4 – 3	114.3	88.9	102
4 – 3.1/2	114.3	101.6	102
5 – 2	141.3	60.3	127
5 – 2.1/2	141.3	73	127
5 – 3	141.3	88.9	127
5 – 3.1/2	141.3	101.6	127
5 – 4	141.3	114.3	127
6 – 2.1/2	168.3	73	140
6 – 3	168.3	88.9	140
6 – 3.1/2	168.3	101.6	140
6 – 4	168.3	114.3	140
6 – 5	168.3	141.3	140
8 – 3.1/2	219.1	101.6	152
8 – 4	219.1	114.3	152
8 – 5	219.1	141.3	152
8 – 6	219.1	168.3	152
10 – 4	273	114.3	178
10 – 5	273	141.3	178
10 – 6	273	168.3	178
10 – 8	273	219.1	178
12 – 5	323.9	141.3	203
12 – 6	323.9	168.3	203
12 – 8	323.9	219.1	203
12 – 10	323.9	273	203
14 – 6	355.6	168.3	330
14 – 8	355.6	219.1	330
14 – 10	355.6	273	330
14 – 12	355.6	323.9	330
16 – 8	406.4	219	356
16 – 10	406.4	273	356
16 – 12	406.4	323.9	356
16 – 14	406.4	355.6	356
18 – 10	457	273	381
18 – 12	457	323.9	381
18 – 14	457	355.6	381
18 – 16	457	406.4	381
20 – 12	508	323.9	508
20 – 14	508	355.6	508
20 – 16	508	406.4	508
20 – 18	508	457	508
22 – 14	559	355.6	508
22 – 16	559	406.4	508
22 – 18	559	457	508
22 – 20	559	508	508
24 – 16	610	406.4	508
24 – 18	610	457	508
24 – 20	610	508	508
24 – 22	610	559	508
26 – 18	660	457	610
26 – 20	660	508	610
26 – 22	660	559	610
26 – 24	660	610	610
28 – 18	711	457	610
28 – 20	711	508	610
28 – 24	711	610	610
28 – 26	711	660	610
30 – 20	762	508	610
30 – 24	762	610	610
30 – 26	762	660	610
30 – 28	762	711	610
32 – 24	813	610	610
32 – 26	813	660	610
32 – 28	813	711	610
32 – 30	813	762	610
34 – 24	864	610	610
34 – 26	864	660	610
34 – 30	864	762	610
34 – 32	864	813	610
36 – 24	914	610	610
36 – 26	914	660	610
36 – 30	914	762	610
36 – 32	914	813	610
36 – 34	914	864	610
38 – 26	965	660	610
38 – 28	965	711	610
38 – 30	965	762	610
38 – 32	965	813	610
38 – 34	965	864	610
38 – 36	965	914	610
40 – 30	1016	762	610
40 – 32	1016	813	610
40 – 34	1016	864	610
40 – 36	1016	914	610
40 – 38	1016	965	610

Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer. Dimensional Tolerances of Concentric and Eccentric Reducers ASME B16.9

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4	5 to 8
Outside Diameter at Bevel (D)	+ 1.6– 0.8	1.6	1.6	+ 2.4– 1.6
Inside Diameter at End	0.8	1.6	1.6	1.6
Overall Length (H)	2	2	2	2
Nominal Pipe Size	10 to 18	20 to 24	26 to 30	32 to 48
Outside Diameter at Bevel (D)	+ 4– 3.2	+ 6.4– 4.8	+ 6.4– 4.8	+ 6.4– 4.8
Inside Diameter at End	3.2	4.8	+ 6.4– 4.8	+ 6.4– 4.8
Overall Length (H)	2	2	5	5
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Butt Weld Reducers

Concentric and Eccentric ASME B16.9

NPS	O.D.D	O.D.D1	LengthH
3/4 – 1/2	26.7	21.3	38
1 – 1/2	33.4	21.3	51
1 – 3/4	33.4	26.7	51
1.1/4 – 1/2	42.2	21.3	51
1.1/4 – 3/4	42.2	26.7	51
1.1/4 – 1	42.2	33.4	51
1.1/2 – 1/2	48.3	21.3	64
1.1/2 – 3/4	48.3	26.7	64
1.1/2 – 1	48.3	33.4	64
1.1/2 – 1.1/4	48.3	42.2	64
2 – 3/4	60.3	26.7	76
2 – 1	60.3	33.4	76
2 – 1.1/4	60.3	42.2	76
2 – 1.1/2	60.3	48.3	76
2.1/2 – 1	73	33.4	89
2.1/2 – 1.1/4	73	42.2	89
2.1/2 – 1.1/2	73	48.3	89
2.1/2 – 2	73	60.3	89
3 – 1.1/4	88.9	42.2	89
3 – 1.1/2	88.9	48.3	89
3 – 2	88.9	60.3	89
3 – 2.1/2	88.9	73	89
3.1/2 – 1.1/4	101.6	42.2	102
3.1/2 – 1.1/2	101.6	48.3	102
3.1/2 – 2	101.6	60.3	102
3.1/2 – 2.1/2	101.6	73	102
3.1/2 – 3	101.6	88.9	102
4 – 1.1/2	114.3	48.3	102
4 – 2	114.3	60.3	102
4 – 2.1/2	114.3	73	102
4 – 3	114.3	88.9	102
4 – 3.1/2	114.3	101.6	102
5 – 2	141.3	60.3	127
5 – 2.1/2	141.3	73	127
5 – 3	141.3	88.9	127
5 – 3.1/2	141.3	101.6	127
5 – 4	141.3	114.3	127
6 – 2.1/2	168.3	73	140
6 – 3	168.3	88.9	140
6 – 3.1/2	168.3	101.6	140
6 – 4	168.3	114.3	140
6 – 5	168.3	141.3	140
8 – 3.1/2	219.1	101.6	152
8 – 4	219.1	114.3	152
8 – 5	219.1	141.3	152
8 – 6	219.1	168.3	152
10 – 4	273	114.3	178
10 – 5	273	141.3	178
10 – 6	273	168.3	178
10 – 8	273	219.1	178
12 – 5	323.9	141.3	203
12 – 6	323.9	168.3	203
12 – 8	323.9	219.1	203
12 – 10	323.9	273	203
14 – 6	355.6	168.3	330
14 – 8	355.6	219.1	330
14 – 10	355.6	273	330
14 – 12	355.6	323.9	330
16 – 8	406.4	219	356
16 – 10	406.4	273	356
16 – 12	406.4	323.9	356
16 – 14	406.4	355.6	356
18 – 10	457	273	381
18 – 12	457	323.9	381
18 – 14	457	355.6	381
18 – 16	457	406.4	381
20 – 12	508	323.9	508
20 – 14	508	355.6	508
20 – 16	508	406.4	508
20 – 18	508	457	508
22 – 14	559	355.6	508
22 – 16	559	406.4	508
22 – 18	559	457	508
22 – 20	559	508	508
24 – 16	610	406.4	508
24 – 18	610	457	508
24 – 20	610	508	508
24 – 22	610	559	508
26 – 18	660	457	610
26 – 20	660	508	610
26 – 22	660	559	610
26 – 24	660	610	610
28 – 18	711	457	610
28 – 20	711	508	610
28 – 24	711	610	610
28 – 26	711	660	610
30 – 20	762	508	610
30 – 24	762	610	610
30 – 26	762	660	610
30 – 28	762	711	610
32 – 24	813	610	610
32 – 26	813	660	610
32 – 28	813	711	610
32 – 30	813	762	610
34 – 24	864	610	610
34 – 26	864	660	610
34 – 30	864	762	610
34 – 32	864	813	610
36 – 24	914	610	610
36 – 26	914	660	610
36 – 30	914	762	610
36 – 32	914	813	610
36 – 34	914	864	610
38 – 26	965	660	610
38 – 28	965	711	610
38 – 30	965	762	610
38 – 32	965	813	610
38 – 34	965	864	610
38 – 36	965	914	610
40 – 30	1016	762	610
40 – 32	1016	813	610
40 – 34	1016	864	610
40 – 36	1016	914	610
40 – 38	1016	965	610

Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer. Dimensional Tolerances of Concentric and Eccentric Reducers ASME B16.9

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4	5 to 8
Outside Diameter at Bevel (D)	+ 1.6– 0.8	1.6	1.6	+ 2.4– 1.6
Inside Diameter at End	0.8	1.6	1.6	1.6
Overall Length (H)	2	2	2	2
Nominal Pipe Size	10 to 18	20 to 24	26 to 30	32 to 48
Outside Diameter at Bevel (D)	+ 4– 3.2	+ 6.4– 4.8	+ 6.4– 4.8	+ 6.4– 4.8
Inside Diameter at End	3.2	4.8	+ 6.4– 4.8	+ 6.4– 4.8
Overall Length (H)	2	2	5	5
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Dimensions Butt Weld Caps ASME B16.9

NPS	O.D. D	Length H	Length H(1)
1/2	21.3	25	25
3/4	26.7	25	25
1	33.4	38	38
1.1/4	42.2	38	38
1.1/2	48.3	38	38
2	60.3	38	44
2.1/2	73	38	51
3	88.9	51	64
3.1/2	101.6	64	76
4	114.3	64	76
5	141.3	76	89
6	168.3	89	102
8	219.1	102	127
10	273	127	152
12	323.8	152	178
14	355.6	165	191
16	406.4	178	203
18	457	203	229
20	508	229	254
22	559	254	254
24	610	267	305
26	660	267	–
28	711	267	–
30	762	267	–
32	813	267	–
34	864	237	–
36	914	267	–
38	965	305	–
40	1016	305	–
42	1067	305	–
44	1118	343	–
46	1168	343	–
48	1219	343	–

General notes..

• Dimensions are in millimeters unless otherwise indicated.
• Wall thickness (t) must be specified by customer.
• The shape shall be ellipsoidal and shall conform to the requirements given in the ASME Boiler and Pressure Vessel Code.
• Length (H) applies for thickness not exceeding that given in column “Wall Thickness” for Length, H.
• Length (H1) applies for thickness greater than that given in column “Wall Thickness” for NPS 24 and smaller. For NPS 26 and larger, length H1 shall be by agreement between the manufacturerand purchaser.

Dimensional Tolerances of End Caps ASME B16.9

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4	5 to 8
Outside Diameterat Bevel (D)	+ 1.6– 0.8	1.6	1.6	+ 2.4– 1.6
Inside Diameter at End	0.8	1.6	1.6	1.6
Overall Length (H)	3	3	3	6
Nominal Pipe Size	10 to 18	20 to 24	26 to 30	32 to 48
Outside Diameterat Bevel (D)	+ 4– 3.2	+ 6.4– 4.8	+ 6.4– 4.8	+ 6.4– 4.8
Inside Diameter at End	3.2	4.8	+ 6.4– 4.8	+ 6.4– 4.8
Overall Length (H)	6	6	10	10
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted. Note..MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.

Weights of Buttweld Caps

NPS	STD	XS	SCH 160	XXS
1	0.09	0.14	0.18	0.23
1.1/4	0.14	0.18	0.23	0.34
1.1/2	0.18	0.23	0.27	0.41
2	0.27	0.34	0.57	0.68
2.1/2	0.41	0.45	0.79	1.13
3	0.68	0.79	1.32	1.81
3.1/2	0.91	1.13	–	2.72
4	1.13	1.36	2.68	3.4
5	2.04	2.49	4.54	5.44
6	2.95	4.08	6.8	8.16
8	5.44	7.26	14.06	13.61
10	9.07	11.34	25.85	–
12	13.61	16.33	43.09	–
14	16.33	20.41	–	–
16	18.14	24.49	–	–
18	24.49	32.66	–	–
20	34.02	39.01	–	–
22	42.64	56.7	–	–
24	43.54	58.97	–	–
26	53.98	72.12	–	–
30	78.02	103.87	–	–

All weights are in kilograms and approximated or estimated.

Buttweld Fitting Weights

ASME buttweld fitting specifications do not specify weights for fittings. Weights quoted in the table on this page are based on manufacturers information and should be considered as approximate and provided as a guide only (fitting weights can vary considerably between manufacturers due to differences in construction). Weights in these tables are taken from Hackney Ladish, Inc. Hackney Ladish, Inc. is one of the largest and most versatile fitting producers in the world. Hackney Ladish, Inc. is headquartered in Dallas, TX and operates 2 facilities containing 380,000 square feet of manufacturing.

Dimensions Lap Joint Stub Ends schedule STD XS ASME B16.9

  Schedule STD

NPS	OD	T	G	F	R	kg
1/2	21.3	2.77	34.9	76.2	3.18	0.16
3/4	26.7	2.87	42.9	76.2	3.18	0.23
1	33.4	3.38	50.8	101.6	3.18	0.29
1.1/4	42.2	3.56	63.5	101.6	4.76	0.45
1.1/2	48.3	3.68	73	101.6	6.35	0.54
2	60.3	3.91	92.1	152.4	7.94	1
2.1/2	73	5.16	104.8	152.4	7.94	1.5
3	88.9	5.49	127	152.4	9.53	2.1
3.1/2	101.6	5.74	139.7	152.4	9.53	2.5
4	114.3	6.02	157.2	152.4	11.11	3
5	141.3	6.55	185.7	203.2	11.11	5.4
6	168.3	7.11	215.9	203.2	12.70	7.3
8	219.1	8.18	269.9	203.2	12.70	11.6
10	273.1	9.27	323.9	254	12.70	18
12	323.9	9.53	381	254	12.70	21
14	355.6	9.53	412.8	304.8	12.70	28
16	406.4	9.53	469.9	304.8	12.70	34
18	457.2	9.53	533.4	304.8	12.70	39
20	508	9.53	584.2	304.8	12.70	44
24	609.6	9.53	692.2	304.8	12.70	57

Dimensions are in millimeters unless otherwise indicated. Weights are in kilograms and approximately given. Schedule XS

NPS	OD	T	G	F	R	kg
1/2	21.3	3.73	34.9	76.2	3.18	0.2
3/4	26.7	3.91	42.9	76.2	3.18	0.3
1	33.4	4.55	50.8	101.6	3.18	0.4
1.1/4	42.2	4.85	63.5	101.6	4.76	0.6
1.1/2	48.3	5.08	73	101.6	6.35	0.7
2	60.3	5.54	92.1	152.4	7.94	1.4
2.1/2	73	7.01	104.8	152.4	7.94	2
3	88.9	7.62	127	152.4	9.53	2.9
3.1/2	101.6	8.08	139.7	152.4	9.53	3.4
4	114.3	8.56	157.2	152.4	11.11	4.1
5	141.3	9.53	185.7	203.2	11.11	7.5
6	168.3	10.97	215.9	203.2	12.70	10
8	219.1	12.70	269.9	203.2	12.70	16
10	273.1	12.70	323.9	254	12.70	24
12	323.9	12.70	381	254	12.70	29
14	355.6	12.70	412.8	304.8	12.70	38
16	406.4	12.70	469.9	304.8	12.70	43
18	457.2	12.70	533.4	304.8	12.70	49
20	508	12.70	584.2	304.8	12.70	63
24	609.6	12.70	692.2	304.8	12.70	76

Dimensions are in millimeters unless otherwise indicated. Weights are in kilograms and approximately given.

Dimensional Tolerances of Stub Ends ASME B16.9

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4	5 to 8	10 to 18	20 to 24
Outside Diameter at Welding End (OD)	+1.6–0.8	1.6	1.6	+2.29–1.6	+4.06–3.05	+6.35–4.83
Overall Length (F)	1.6	1.6	1.6	1.6	2	2
Outside Diameter of Lap (G)	+0–0.76	+0–0.76	+0–0.76	+0–0.76	+0–1.6	+0–1.6
Thickness of Lap (T)	+1.52–0	+1.52–0	+1.52–0	+1.52–0	+1.52–0	+1.52–0
Fillet Radius of Lap (R)	+0–0.76	+0–0.76	+0–1.6	+0–1.6	+0–1.6	+0–1.6
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated.

Dimensions butt welded Stub Ends

schedule 10S MSS SP-43 type A/B

NPS	OD	T	G	F	R Type A	R Type B
1/2	21.3	2.11	34.9	50.8	3.05	0.76
3/4	26.7	2.11	42.9	50.8	3.05	0.76
1	33.4	2.77	50.8	50.8	3.05	0.76
1.1/4	42.2	2.77	63.5	50.8	4.83	0.76
1.1/2	48.3	2.77	73	50.8	6.35	0.76
2	60.3	2.77	92.1	63.5	7.87	0.76
2.1/2	73	3.05	104.8	63.5	7.87	0.76
3	88.9	3.05	127	63.5	9.65	0.76
3.1/2	101.6	3.05	139.7	76.2	9.65	0.76
4	114.3	3.05	157.2	76.2	11.18	0.76
5	141.3	3.40	185.7	76.2	11.18	1.52
6	168.3	3.40	215.9	88.9	12.7	1.52
8	219.1	3.76	269.9	101.6	12.7	1.52
10	273.1	4.19	323.9	127	12.7	1.52
12	323.9	4.57	381	152.4	12.7	1.52
14	355.6	4.78	412.8	152.4	12.70	1.52
16	406.4	4.78	469.9	152.4	12.7	1.52
18	457.2	4.78	533.4	152.4	12.70	1.52
20	508	5.54	584.2	152.4	12.70	1.52
24	609.6	6.35	692.2	152.4	12.7	1.52

Dimensions are in millimeters unless otherwise indicated. Weights are in kilograms and approximately given. Dimensional Tolerances Stub Ends MSS SP-43

Nominal Pipe Size	1/2 to 2.1/2	3 to 3.1/2	4	5 to 8	10 to 18	20 to 24
Outside Diameter at Welding End (OD)	0.8	0.8	0.8	+1.6–0.8	+2.29–0.76	+3.05–0.76
Overall Length (F)	1.6	1.6	1.6	1.6	2	2
Outside Diameter of Lap (G)	+0–0.76	+0–0.76	+0–0.76	+0–0.76	+0–1.6	+0–1.6
Thickness of Lap (T)	+1.52–0	+1.52–0	+1.52–0	+1.52–0	+1.52–0	+1.52–0
Fillet Radius of Lap (R)	+0–0.76	+0–0.76	+0–1.6	+0–1.6	+0–1.6	+0–1.6
Wall Thickness (t)	Not less than 87.5% of Nominal Wall Thickness

Dimensional tolerances are in millimeters unless otherwise indicated. Notes..

• Type A for Lap Joint Flanges
• Type B for Slip On Flanges
• MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.