As a specialized manufacturer with over 25 years of exclusive focus on factory-made wrought buttwelding fittings, we produce one of the most comprehensive ranges of ASTM A403 WP304L / WP304L-S fittings in full compliance with ASME B16.9-2024.
304L is the low-carbon variant of the world's most widely used austenitic stainless steel and remains the material of choice for process piping in chemical, pharmaceutical, food & beverage, semiconductor, and general industrial applications where excellent corrosion resistance, weldability, and long-term reliability are non-negotiable.
The ASME B16.9 specification governs the design, tolerances, and testing of factory-made wrought buttwelding fittings, ensuring seamless integration into piping systems for industries such as oil and gas, chemical processing, pharmaceuticals, and power generation.
Our ASME B16.9 WP304L Buttwelding Pipe Fittings
|
NPS |
OD (mm) |
90° LR Center-to-End A (mm) |
90° SR Center-to-End A (mm) |
45° LR Center-to-End B (mm) |
|
1/2 |
21.3 |
38 |
– |
16 |
|
3/4 |
26.7 |
38 |
– |
19 |
|
1 |
33.4 |
38 |
25 |
22 |
|
1¼ |
42.2 |
48 |
32 |
25 |
|
1½ |
48.3 |
57 |
38 |
29 |
|
2 |
60.3 |
76 |
51 |
35 |
|
2½ |
73.0 |
95 |
64 |
44 |
|
3 |
88.9 |
114 |
76 |
51 |
|
4 |
114.3 |
152 |
102 |
64 |
|
5 |
141.3 |
190 |
127 |
79 |
|
6 |
168.3 |
229 |
152 |
95 |
|
8 |
219.1 |
305 |
203 |
127 |
|
203 |
||||
|
10 |
273.0 |
381 |
254 |
159 |
|
12 |
323.8 |
457 |
305 |
190 |
|
14 |
355.6 |
533 |
356 |
222 |
|
16 |
406.4 |
610 |
406 |
254 |
|
18 |
457 |
686 |
457 |
286 |
|
20 |
508 |
762 |
508 |
318 |
|
24 |
610 |
914 |
610 |
381 |
2. Equal & Reducing Tees / Crosses
Center-to-end dimensions for straight tees and crosses are identical to 90° long-radius elbows of the same size (dimension A above). Reducing tees are manufactured with run and branch combinations as required.
Concentric & Eccentric Reducers
|
NPS (Large) × (Small) |
Length H (mm) |
|
¾ × ½ |
38 |
|
1 × ¾ |
51 |
|
1 × ½ |
51 |
|
1¼ × 1 |
51 |
|
1¼ × ¾ |
51 |
|
1½ × 1¼ |
64 |
|
1½ × 1 |
64 |
|
1½ × ¾ |
64 |
|
2 × 1½ |
76 |
|
2 × 1¼ |
76 |
|
3 × 2 |
89 |
|
4 × 3 |
102 |
|
6 × 5 |
140 |
|
8 × 6 |
168 |
|
10 × 8 |
216 |
|
12 × 10 |
254 |
|
16 × 12 |
305 |
|
20 × 16 |
356 |
|
24 × 20 |
406 |
Larger and non-standard reductions are manufactured to exact project requirements.
4. Caps
|
NPS |
Length E (mm) |
Wall Thickness (Sch 10S) min (mm) |
|
1/2 |
25 |
2.77 |
|
3/4 |
25 |
2.87 |
|
1 |
38 |
3.38 |
|
1½ |
38 |
3.68 |
|
2 |
38 |
3.91 |
|
3 |
64 |
4.57 |
|
4 |
76 |
4.78 |
|
6 |
89 |
5.54 |
|
8 |
102 |
7.04 |
|
10 |
127 |
7.80 |
|
12 |
152 |
8.56 |
|
16 |
178 |
9.53 |
|
20 |
203 |
11.13 |
|
24 |
229 |
13.49 |
5. Lap-Joint Stub Ends
Available in short (MSS SP-43) and long patterns. Radius and lap thickness precisely matched to ASME B16. 5 lap-joint flanges.
Advantages of Our SS 304L Pipe Fittings
Superior Weldability: Low carbon content prevents intergranular corrosion in heat-affected zones, reducing post-weld failure risks.
Corrosion Resistance: The chromium-nickel matrix resists oxidizers, acids, and chlorides, making it ideal for chemical and marine applications.
Dimensional Precision: ASME B16.9-compliant tolerances ensure leak-proof buttwelded joints without requiring alignment adjustments.
Cost Efficiency: Long service life and low maintenance reduce total ownership costs.
Certifications: Compliance with ASTM A403, MSS SP-43, DIN 2605, and PED ensures global acceptability.
Contact our team today for quotations and stock availability. We are ready to be your long-term 304L buttwelding fittings partner.
