Steel Butt-Welding Seamless Pipe Fittings - National GB Standard - abter steel pipe manufacturer, natural gas casing and tubing,seamless steel pipe,OCTG,

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May 30, 2026

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June 22, 2026

Steel Butt-Welding Seamless Pipe Fittings – National GB Standard

1 Scope

This standard specifies the dimensions, tolerances, technical requirements, inspection and marking of carbon steel, alloy steel and austenitic stainless steel butt-welding seamless pipe fittings (including elbows, reducers, tees, crosses and caps).

This standard applies to carbon steel, alloy steel and austenitic stainless steel butt-welding seamless pipe fittings used for pipeline engineering in petroleum, chemical, hydropower, metallurgy, textile and other industries.

2 Referenced Standards

GB 8163 Seamless Steel Pipes for Liquid Service
GB 6479 High-pressure Seamless Steel Pipes for Chemical Fertilizer Equipment
GB 5310 Seamless Steel Pipes for High-pressure Boilers
GB 3087 Seamless Steel Pipes for Low and Medium Pressure Boilers
GB 2270 Stainless Steel Seamless Steel Pipes
GB 3077 Alloy Structural Steel – Technical Requirements
GB 3274 Technical Conditions for Hot Rolled Carbon Structural Steel and Low Alloy Structural Steel Thick Plates
GB 912 Carbon Structural Steel and Low Alloy Structural Steel Thin Steel Plates
GB 6654 Carbon Steel and Low Alloy Steel Thick Plates for Pressure Vessels
GB 713 Carbon Steel and Low Alloy Steel Plates for Boiler Manufacturing
GB 3280 Cold Rolled Stainless Steel Plates
GB 4237 Hot Rolled Stainless Steel Plates

3 Classification

3.1 Types and Codes

The types and codes of butt-welding seamless pipe fittings specified in this standard are shown in Table 1.

Table 1 Types and Codes of Butt-Welding Seamless Pipe Fittings

Product	Type	Code
45° Elbow	Long Radius	45E(L)
90° Elbow	Long Radius	90E(L)
90° Elbow	Short Radius	90E(S)
Long Radius Reducing Elbow	Long Radius	90E(L)R
180° Elbow	Long Radius	180E(L)
180° Elbow	Short Radius	180E(S)
Reducer	Concentric	R(C)
Reducer	Eccentric	R(E)
Tee	Equal Diameter	T(S)
Tee	Reducing	T(R)
Cross	Equal Diameter	CR(S)
Cross	Reducing	CR(R)
Pipe Cap	—	C

3.2 Dimensions and Tolerances

3.2.1 Dimensions

There are two series (Series A and Series B) for the outside diameter of fitting ends. Series A shall be preferred.

3.2.1.1 Elbows

The structure and dimensions of elbows shall comply with Figure 1 and Table 2 respectively.

Note: Values in parentheses shall be avoided as far as possible.

Table 2 Dimensions of 45° Elbow, 90° Elbow and 180° Elbow (Unit: mm)

Nominal Diameter DN	End Outside Diameter D		Center to End H 45° Elbow	Center to End F 90° Elbow		Center to Center P 180° Elbow		Back to End K 180° Elbow
Nominal Diameter DN	Series A	Series B	Long Radius	Long Radius	Short Radius	Long Radius	Short Radius	Long Radius	Short Radius
15	21.3	18	16	38	—	76	—	48	—
20	26.9	25	16	38	—	76	—	51	—
25	33.7	32	16	38	25	76	51	56	41
32	42.4	38	20	48	32	95	64	70	52
40	48.3	45	24	57	38	114	76	83	62
50	60.3	57	32	76	51	152	102	106	81
65	76.1 (73)	76	40	95	64	191	127	132	100
80	88.9	89	47	114	76	229	152	159	121
90	101.6	—	55	133	89	267	178	184	140
100	114.3	108	63	152	102	305	203	210	159
125	139.7	133	79	190	127	381	254	262	197
150	168.3	159	95	229	152	457	305	313	237
200	219.1	219	126	305	203	610	406	414	313
250	273.0	273	158	381	254	762	508	518	391
300	323.9	325	189	457	305	914	610	619	467
350	355.6	377	221	533	356	1067	711	711	533
400	406.4	426	253	610	406	1219	813	813	610
450	457.0	478	284	686	457	1372	914	914	686
500	508.0	529	316	762	508	1524	1016	1016	762

3.2.1.2 90° Long Radius Reducing Elbow

The structure and dimensions of 90° long radius reducing elbow shall comply with Figure 2 and Table 3 respectively.

Table 3 Dimensions of 90° Long Radius Reducing Elbow (Unit: mm)

Nominal Diameter DN	End Outside Diameter D₁		End Outside Diameter D₂		Center to End F
Nominal Diameter DN	Series A	Series B	Series A	Series B	mm
50×40	60.3	57	48.3	45	76
50×32	60.3	57	42.4	38	76
50×25	60.3	57	33.7	32	76
65×50	76.1 (73)	76	60.3	57	95
65×40	76.1 (73)	76	48.3	45	95
65×32	76.1 (73)	76	42.4	38	95
80×65	88.9	89	76.1 (73)	76	114
80×50	88.9	89	60.3	57	114
80×40	88.9	89	48.3	45	114
90×80	101.6	—	88.9	—	133
90×65	101.6	—	76.1 (73)	—	133
90×50	101.6	—	60.3	—	133
100×90	114.3	—	101.6	—	152
100×80	114.3	108	88.9	89	152
100×65	114.3	108	76.1 (73)	76	152
100×50	114.3	108	60.3	57	152
125×100	139.7	133	114.3	108	190
125×90	139.7	—	101.6	—	190
125×80	139.7	133	88.9	89	190
125×65	139.7	133	76.1 (73)	76	190
150×125	168.3	159	139.7	133	229
150×100	168.3	159	114.3	108	229
150×90	168.3	—	101.6	—	229
150×80	168.3	159	88.9	89	229
200×150	219.1	219	168.3	159	305
200×125	219.1	219	139.7	133	305
200×100	219.1	219	114.3	108	305
250×200	273.0	273	219.1	219	381
250×150	273.0	273	168.3	159	381
250×125	273.0	273	139.7	133	381
300×250	323.9	325	273.0	273	457
300×200	323.9	325	219.1	219	457
300×150	323.9	325	168.3	159	457
350×300	355.6	377	323.9	325	533
350×250	355.6	377	273.0	273	533
350×200	355.6	377	219.1	219	533
400×350	406.4	426	355.6	377	610
400×300	406.4	426	323.9	325	610
400×250	406.4	426	273.0	273	610
450×400	457.0	478	406.4	426	686
450×350	457.0	478	355.6	377	686
450×300	457.0	478	323.9	325	686
450×250	457.0	478	273.0	273	686
500×450	508.0	529	457.0	478	762
500×400	508.0	529	406.4	426	762
500×350	508.0	529	355.6	377	762
500×300	508.0	529	323.9	325	762
500×250	508.0	529	273.0	273	762

Note: Values in parentheses shall be avoided as far as possible.

3.2.1.3 Reducers

The structure and dimensions of concentric and eccentric reducers shall comply with Figure 3 and Table 4 respectively.

Table 4 Dimensions of Reducers (Unit: mm)

Nominal Diameter DN	End Outside Diameter D₁		End Outside Diameter D₂		Length L
Nominal Diameter DN	Series A	Series B	Series A	Series B	mm
20×15	26.9	25	21.3	18	38
25×20	33.7	32	26.9	25	51
25×15	33.7	32	21.3	18	51
32×25	42.4	38	33.7	32	51
32×20	42.4	38	26.9	25	51
32×15	42.4	38	21.3	18	51
40×32	48.3	45	42.4	38	64
40×25	48.3	45	33.7	32	64
40×20	48.3	45	26.9	25	64
40×15	48.3	45	21.3	18	64
50×40	60.3	57	48.3	45	76
50×32	60.3	57	42.4	38	76
50×25	60.3	57	33.7	32	76
50×20	60.3	57	26.9	25	76
65×50	76.1 (73)	76	60.3	57	89
65×40	76.1 (73)	76	48.3	45	89
65×32	76.1 (73)	76	42.4	38	89
65×25	76.1 (73)	76	33.7	32	89
80×65	88.9	89	76.1 (73)	76	89
80×50	88.9	89	60.3	57	89
80×40	88.9	89	48.3	45	89
80×32	88.9	89	42.4	38	89
90×80	101.6	—	88.9	—	102
90×65	101.6	—	76.1 (73)	—	102
90×50	101.6	—	60.3	—	102
90×40	101.6	—	48.3	—	102
90×32	101.6	—	42.4	—	102
100×90	114.3	—	101.6	—	102
100×80	114.3	108	88.9	89	102
100×65	114.3	108	76.1 (73)	76	102
100×50	114.3	108	60.3	57	102
100×40	114.3	108	48.3	45	102
125×100	139.7	133	114.3	108	127
125×90	139.7	—	101.6	—	127
125×80	139.7	133	88.9	89	127
125×65	139.7	133	76.1 (73)	76	127
125×50	139.7	133	60.3	57	127
150×125	168.3	159	139.7	133	140
150×100	168.3	159	114.3	108	140
150×90	168.3	—	101.6	—	140
150×80	168.3	159	88.9	89	140
150×65	168.3	159	76.1 (73)	76	140
200×150	219.1	219	168.3	159	152
200×125	219.1	219	139.7	133	152
200×100	219.1	219	114.3	108	152
200×90	219.1	—	101.6	—	152
250×200	273.0	273	219.1	219	178
250×150	273.0	273	168.3	159	178
250×125	273.0	273	139.7	133	178
250×100	273.0	273	114.3	108	178
300×250	323.9	325	273.0	273	203
300×200	323.9	325	219.1	219	203
300×150	323.9	325	168.3	159	203
300×125	323.9	325	139.7	133	203
350×300	355.6	377	323.9	325	330
350×250	355.6	377	273.0	273	330
350×200	355.6	377	219.1	219	330
350×150	355.6	377	168.3	159	330
400×350	406.4	426	355.6	377	356
400×300	406.4	426	323.9	325	356
400×250	406.4	426	273.0	273	356
400×200	406.4	426	219.1	219	356
450×400	457.2	478	406.4	426	381
450×350	457.2	478	355.6	377	381
450×300	457.2	478	323.9	325	381
450×250	457.2	478	273.0	273	381
500×450	508.0	529	457.0	478	508
500×400	508.0	529	406.4	426	508
500×350	508.0	529	355.6	377	508
500×300	508.0	529	323.9	325	508

Note: Values in parentheses shall be avoided as far as possible.

3.2.1.4 Equal Diameter Tees and Crosses

The structure and dimensions of equal diameter tees and crosses shall comply with Figure 4 and Table 5 respectively.

Table 5 Dimensions of Equal Diameter Tees and Crosses (Unit: mm)

Nominal Diameter DN	End Outside Diameter D₁, D₂		Center to End C, M
Nominal Diameter DN	Series A	Series B	mm
15	21.3	18	25
20	26.9	25	29
25	33.7	32	38
32	42.4	38	48
40	48.3	45	57
50	60.3	57	64
65	76.1 (73)	76	76
80	88.9	89	86
90	101.6	—	95
100	114.3	108	105
125	139.7	133	124
150	168.3	159	143
200	219.1	219	178
250	273.0	273	216
300	323.9	325	254
350	355.6	377	279
400	406.4	426	305
450	457.0	478	343
500	508.0	529	381

Note: Values in parentheses shall be avoided as far as possible.

3.2.1.5 Reducing Tees and Crosses

The structure and dimensions of reducing tees and crosses shall comply with Figure 5 and Table 6 respectively.

Table 6 Dimensions of Reducing Tees and Crosses (Unit: mm)

Nominal Diameter DN	End Outside Diameter D₁		End Outside Diameter D₂		Center to End C	Center to End M
Nominal Diameter DN	Series A	Series B	Series A	Series B	mm	mm
20×20×15	26.9	25	21.3	18	29	29
25×25×20	33.7	32	26.9	25	38	38
25×25×15	33.7	32	21.3	18	38	38
32×32×25	42.4	38	33.7	32	48	48
32×32×20	42.4	38	26.9	25	48	48
32×32×15	42.4	38	21.3	18	48	48
40×40×32	48.3	45	42.4	38	57	57
40×40×25	48.3	45	33.7	32	57	57
40×40×20	48.3	45	26.9	25	57	57
40×40×15	48.3	45	21.3	18	57	57
50×50×40	60.3	57	48.3	45	64	60
50×50×32	60.3	57	42.4	38	64	57
50×50×25	60.3	57	33.7	32	64	51
50×50×20	60.3	57	26.9	25	64	44
65×65×50	76.1 (73)	76	60.3	57	76	70
65×65×40	76.1 (73)	76	48.3	45	76	67
65×65×32	76.1 (73)	76	42.4	38	76	64
65×65×25	76.1 (73)	76	33.7	32	76	57
80×80×65	88.9	89	76.1 (73)	76	86	83
80×80×50	88.9	89	60.3	57	86	76
80×80×40	88.9	89	48.3	45	86	73
80×80×32	88.9	89	42.4	38	86	70
90×90×80	101.6	—	88.9	—	95	92
90×90×65	101.6	—	76.1 (73)	—	95	89
90×90×50	101.6	—	60.3	—	95	83
90×90×40	101.6	—	48.3	—	95	79
100×100×90	114.3	—	101.6	—	105	102
100×100×80	114.3	108	88.9	89	105	98
100×100×65	114.3	108	76.1 (73)	76	105	95
100×100×50	114.3	108	60.3	57	105	89
100×100×40	114.3	108	48.3	45	105	86
125×125×100	139.7	133	114.3	108	124	117
125×125×90	139.7	—	101.6	—	124	114
125×125×80	139.7	133	88.9	89	124	111
125×125×65	139.7	133	76.1 (73)	76	124	108
125×125×50	139.7	133	60.3	57	124	105
150×150×125	168.3	159	139.7	133	143	137
150×150×100	168.3	159	114.3	108	143	130
150×150×90	168.3	—	101.6	—	143	127
150×150×80	168.3	159	88.9	89	143	124
150×150×65	168.3	159	76.1 (73)	76	143	121
200×200×150	219.1	219	168.3	159	178	168
200×200×125	219.1	219	139.7	133	178	162
200×200×100	219.1	219	114.3	108	178	156
200×200×90	219.1	—	101.6	—	178	152
250×250×200	273.0	273	219.1	219	216	208
250×250×150	273.0	273	168.3	159	216	194
250×250×125	273.0	273	139.7	133	216	191
250×250×100	273.0	273	114.3	108	216	184
300×300×250	323.9	325	273.0	273	254	241
300×300×200	323.9	325	219.1	219	254	229
300×300×150	323.9	325	168.3	159	254	219
300×300×125	323.9	325	139.7	133	254	216
350×350×300	355.6	377	323.9	325	279	270
350×350×250	355.6	377	273.0	273	279	257
350×350×200	355.6	377	219.1	219	279	248
350×350×150	355.6	377	168.3	159	279	238
400×400×350	406.4	426	355.6	377	305	305
400×400×300	406.4	426	323.9	325	305	295
400×400×250	406.4	426	273.0	273	305	283
400×400×200	406.4	426	219.1	219	305	273
400×400×150	406.4	426	168.3	159	305	264
450×450×400	457.2	478	406.4	426	343	330
450×450×350	457.2	478	355.6	377	343	330
450×450×300	457.2	478	323.9	325	343	321
450×450×250	457.2	478	273.0	273	343	308
450×450×200	457.2	478	219.1	219	343	298
500×500×450	508.0	529	457.2	478	381	368
500×500×400	508.0	529	406.4	426	381	356
500×500×350	508.0	529	355.6	377	381	356
500×500×300	508.0	529	323.9	325	381	346
500×500×250	508.0	529	273.0	273	381	333
500×500×200	508.0	529	219.1	219	381	324

Note: Values in parentheses shall be avoided as far as possible.

3.2.1.6 Pipe Caps

The structure and dimensions of pipe caps shall comply with Figure 6 and Table 7 respectively.

Notes:
1. Values in parentheses shall be avoided as far as possible.
2. The head of the pipe cap is elliptical, and the length of the semicircular part shall not be less than 1/4 of the inner diameter of the pipe cap.
3. If the nominal wall thickness of the pipe cap is less than or equal to the limiting thickness, adopt dimension E; if it is greater than the limiting thickness, adopt dimension E₁.

Table 7 Dimensions of Pipe Caps (Unit: mm)

Nominal Diameter DN	End Outside Diameter D		Back to End E	Back to End E₁	Limiting Thickness for E
Nominal Diameter DN	Series A	Series B	mm	mm	mm
15	21.3	18	25	—	—
20	26.9	25	25	—	—
25	33.7	32	38	—	—
32	42.4	38	38	—	—
40	48.3	45	38	—	—
50	60.3	57	38	44	5.5
65	76.1 (73)	76	38	51	7.0
80	88.9	89	51	64	7.6
90	101.6	—	64	76	8.1
100	114.3	108	64	76	8.6
125	139.7	133	76	89	9.5
150	168.3	159	89	102	11.0
200	219.1	219	102	127	12.7
250	273.0	273	127	152	12.7
300	323.9	325	152	178	12.7
350	355.6	377	165	191	12.7
400	406.4	426	178	203	12.7
450	457.0	478	203	229	12.7
500	508.0	529	229	254	12.7

3.2.2 Dimensional Tolerances

3.2.2.1 Limit Deviations of Fitting Dimensions

Notes:
1. Unless otherwise specified by the user, priority shall be given to ensuring the limit deviations of end outside diameter and nominal wall thickness.
2. Wall thickness deviation refers to the limit deviation of nominal wall thickness specified in Appendix A.

Table 8 Limit Deviations of Fitting Dimensions (Unit: mm)

Item	Fitting Type	Nominal Diameter Range
Item	Fitting Type	15~65	80~100	125~200	250~450	500
End Outside Diameter	All fittings	+1.6 / -0.8	±1.6	+2.4 / -1.6	+4.0 / -3.2	+6.4 / -4.8
End Inside Diameter	—	±0.8	±1.6	±3.2	±4.8	—
Wall Thickness	All fittings	Not less than 87.5% of the nominal wall thickness
Center to End (H, F)	45° Elbow, 90° Elbow	±2		±3
Center to Center (P)	180° Elbow	±7			±10
Back to End (K)	180° Elbow	±7			±10
Total Length (L)	Reducer	±2			±3
Center to End (C, M)	Tee, Cross	±2		±3
Back to End (E, E₁)	Pipe Cap	±4		±7

3.2.2.2 Geometric Tolerances of Fittings

The geometric tolerances of fittings shall comply with Figure 7 and Table 9.

Table 9 Geometric Tolerances of Fittings (Unit: mm)

Item	Fitting Type	Nominal Diameter Range
Item	Fitting Type	15~100	125~200	250~300	350~400	450~500
X	Elbow, Reducer, Tee, Cross	1	2	3	4	4
Y	Elbow, Tee, Cross	2	4	5	7	10
U	180° Elbow	1	2	2	2	2

3.3 Weld End Groove

The structure and dimensions of weld end groove shall comply with Figure 8.

Notes:
1. For carbon steel and alloy steel fittings with nominal wall thickness less than 4.8 mm, and austenitic stainless steel fittings with nominal wall thickness less than 3.2 mm, the weld end can be processed into a slight bevel or straight end as selected by the manufacturer.
2. Other groove forms are allowed for special requirements, which shall be specified in the contract.

3.4 Marking Examples

1. 90° short radius elbow, DN100, Series A, Wall Class Sch40:
90E(S) 100 – Sch40 GB 12459

2. Concentric reducer, DN100×80, Series B, Wall Class Sch80:
R(C) 100 x80 B – Sch80 GB 12459

3. Reducing tee, DN100×100×80, Series A, Wall Class Sch40:
T(R)100x100x80- Sch40 GB 12459

4 Technical Requirements

4.1 Materials

4.1.1

Except for pipe caps which are made of steel plates, raw materials for butt-welding seamless fittings are all seamless steel pipes. The common material grades and corresponding standards are shown in Table 10. Fittings made of other materials outside Table 10 are allowed upon user’s request.

Table 10 Material Grades and Relevant Standards

Steel Pipe		Steel Plate
Material Grade	Standard No.	Material Grade	Standard No.
10, 20, 16Mn	GB 3087, GB 8163, GB 6479	A3	GB 3274, GB 912
12CrMo, 15CrMo, 1Cr5Mo	GB 6479	20R, 16MnR	GB 6654
12Cr1MoV	GB 5310, GB 8163, GB 3077	20g	GB 713
0Cr19Ni9, 1Cr18Ni9, 1Cr18Ni9Ti	GB 2270	12CrMo, 15CrMo, 12Cr1MoV	GB 3077
—	—	0Cr19Ni9, 1Cr18Ni9, 1Cr18Ni9Ti	GB 3280, GB 4237

4.1.2

All materials for seamless fittings shall be accompanied by material certificates, and shall be fully re-inspected in accordance with relevant standards before use.

4.1.3

Additional inspection items such as ultrasonic testing, radiographic testing and magnetic particle inspection can be added upon agreement between the supplier and the purchaser, and shall be specified in the contract.

4.2 Heat Treatment

Fittings after forming shall be heat treated in accordance with Table 11.

Table 11 Heat Treatment Requirements

Material Grade	Cold Forming	Hot Forming
A3, 20R, 10, 20, 20g, 16Mn, 16MnR	Normalizing or Annealing
12CrMo, 15CrMo, 1Cr5Mo, 12Cr1MoV	Quenching and Tempering
0Cr19Ni9, 1Cr18Ni9, 1Cr18Ni9Ti	Solution Treatment

Mechanical properties and other requirements after heat treatment shall comply with relevant standards.

4.3 Surface Treatment

4.3.1

Carbon steel and alloy steel fittings shall be derusted and coated with anti-rust paint on inner and outer surfaces.

4.3.2

Austenitic stainless steel fittings shall be pickled and passivated.

5 Tests

5.1 Hydrostatic Test

All fittings manufactured and inspected in accordance with this standard are not required to conduct hydrostatic test in principle, but they shall withstand the hydrostatic test of the whole system.

5.2 Burst Test

The test medium for burst test is liquid. The burst pressure shall not be less than the calculated value of the connected straight pipe.

p = 2σS / D

Where:
p — Calculated burst pressure of straight pipe, MPa
σ — Minimum tensile strength of pipe material, MPa
S — Nominal wall thickness of pipe, mm
D — Outside diameter of pipe, mm

6 Inspection

6.1 Inspection Items

6.1.1 Surface Quality

Finished fittings shall be free from cracks, overheating scars and other defects affecting strength and appearance. Inner and outer surfaces shall be smooth without oxide scale.

6.1.2 Overall Dimensions

Overall dimensions and tolerances of fittings shall comply with Clause 3.2 of this standard.

6.1.3 Non-destructive Testing

Carbon steel and alloy steel fittings shall be inspected by ultrasonic testing or magnetic particle inspection. Austenitic stainless steel fittings shall be inspected by penetrant testing.

6.1.4 Other Inspections

Additional items including chemical composition, mechanical properties, hydrostatic test and radiographic testing can be added via negotiation and specified in the contract.

6.2 Sampling Rules

Sampling shall be implemented in accordance with relevant standards or agreed by both parties. Each batch of finished fittings shall be delivered with product quality certificate.

7 Marking and Stamping

7.1

Permanent marks shall be sprayed or stamped on obvious positions of finished fittings with clear writing. Marking contents include:
a. Product code;
b. Nominal diameter (including outer diameter series);
c. Wall thickness class or wall thickness value;
d. Standard No.;
e. Material grade;
f. Manufacturer name or trademark.

Example 1: 90° short radius elbow, DN100, Series A, Sch40, material 15CrMo
90E(S) -100- Sch40 -15CrMo GB 12459

Example 2: Concentric reducer, DN100×80, Series B, Sch80, material 16Mn
R(C)-100x80B-Sch80-16Mn GB 12459

7.2

For small-size fittings which cannot mark all contents, items can be omitted in order, or nameplates/labels can be used instead.

7.3

When using steel stamping, the indentation depth shall be controlled to avoid cracks or wall thickness below the specified minimum value.

8 Packaging

8.1

Fitting ends shall be protected. Fittings of different materials shall be packed separately as required by the contract.

8.2

Durable paint shall be used to mark consignee, product name, specification, quantity, net weight, gross weight, manufacturer and delivery information on the outer package.

8.3

Packing list and quality certificate sealed in plastic bags shall be placed inside the package. Finished products shall be stored indoors in dry environment, not exposed outdoors.

8.4 Content of Quality Certificate

a. Manufacturer name and production date;
b. Product name and specification;
c. Chemical composition and mechanical property test results of steel;
d. Results of all inspections.
The certificate shall be sealed and signed by inspectors with inspection date.

8.5 Content of Packing List

a. Manufacturer name;
b. Factory No. and date;
c. Product name, specification, quantity and net weight;
d. Consignee and contract No.;
e. Name and quantity of attached documents.
The packing list shall be sealed and signed by packers with packing date.

Appendix A (Informative) Wall Thickness Classification of Steel Seamless Fittings

Table A1 Wall Thickness Classification (Unit: mm)

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Nominal Diameter DN	Outside Diameter		Nominal Wall Thickness
Nominal Diameter DN	Series A	Series B	Sch5s	Sch10s	Sch20s	Sch20	Sch30	Sch40	Sch60	Sch80	Sch100	Sch120	Sch140	Sch160
15	21.3	18	1.6	2.1	2.6	—	—	2.9	—	3.6	—	—	—	4.5
20	26.9	25	1.6	2.1	2.6	—	—	2.9	—	4.0	—	—	—	5.6
25	33.7	32	1.6	2.8	3.2	—	—	3.2	—	4.5	—	—	—	6.3
32	42.4	38	1.6	2.8	3.2	—	—	3.6	—	5.0	—	—	—	6.3
40	48.3	45	1.6	2.8	3.2	—	—	3.6	—	5.0	—	—	—	7.1
50	60.3	57	1.6	2.8	3.6	3.2	—	4.0	—	5.6	—	—	—	8.8
65	76.1(73)	76	2.0	3.0	3.6	4.5	—	5.0	—	7.1	—	—	—	10.0
80	88.9	89	2.0	3.0	4.0	4.5	—	5.6	—	8.0	—	—	—	11.0
90	101.6	—	2.0	3.0	4.0	4.5	—	5.6	—	8.0	—	—	—	12.5
100	114.3	108	2.0	3.0	4.0	5.0	—	5.9	—	8.8	11.0	—	—	14.2
125	139.7	133	2.9	3.4	5.0	5.0	—	6.3	—	10.0	12.5	—	—	16.0
150	168.3	159	2.9	3.4	5.0	5.6	—	7.1	—	11.0	14.2	—	—	17.5
200	219.1	219	2.9	4.0	6.3	6.3	7.1	8.0	10.0	12.5	16.0	17.5	20.0	22.2
250	273.0	273	3.6	4.0	6.3	6.3	8.0	8.8	12.5	16.0	17.5	22.2	25.0	28.0
300	323.9	325	4.0	4.5	6.3	6.3	8.8	10.0	14.2	17.5	22.2	25.0	28.0	32.0
350	355.6	377	4.0	5.0	—	8.0	10.0	11.0	16.0	20.0	25.8	28.0	32.0	36.0
400	406.4	426	4.0	5.0	—	8.0	10.0	12.5	17.5	22.2	28.0	30.0	36.0	40.0
450	457.0	478	4.0	5.0	—	8.0	11.0	14.2	20.0	25.0	30.0	36.0	40.0	45.0
500	508.0	529	5.0	5.6	—	10.0	12.5	16.0	20.0	28.0	32.0	40.0	45.0	50.0

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