ASME B16.5 Class 300 Weld Neck Flange Dimensions & Weight
Precision closed-die drop forged and CNC machined from heat-tracked billets at our Rajkot manufacturing facility. Engineered with unbroken grain flow for high-pressure service up to 740 psi @ 100°F (51.1 bar ambient), adhering to EN 10204 3.1 and ISO 9001:2015 quality requirements.
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ASME B16.5 Class 300 Weld Neck Flanges provide intermediate-to-high pressure containment up to 740 psi. Drop-forged from heat-tracked billets at our Rajkot forging shop with continuous radial grain flow for steam, gas, and heavy oil pipelines.
ASME B16.5 Class 300 Weld Neck Flange Dimensions & Weight — Dimensions & Weight Chart
All dimensions in millimeters (mm) and nominal weights in kilograms (kg) strictly manufactured up to 50 kg per piece.
| NPS | Metric DN | Outside Dia (OD mm) | Flange Thickness (mm) | Bolt Circle PCD (mm) | No. of Bolts | Hole Dia (mm) | Approx Weight (kg) |
|---|---|---|---|---|---|---|---|
| 1/2" | DN15 | 95 mm | 14.3 mm | 66.5 mm | 4 | 16 mm | 1.4 kg✔ (≤50kg) |
| 3/4" | DN20 | 117 mm | 15.9 mm | 82.5 mm | 4 | 19 mm | 2.3 kg✔ (≤50kg) |
| 1" | DN25 | 124 mm | 17.5 mm | 89 mm | 4 | 19 mm | 2.8 kg✔ (≤50kg) |
| 1-1/4" | DN32 | 133 mm | 19.1 mm | 98.5 mm | 4 | 19 mm | 3.8 kg✔ (≤50kg) |
| 1-1/2" | DN40 | 156 mm | 20.6 mm | 114.5 mm | 4 | 22 mm | 5.2 kg✔ (≤50kg) |
| 2" | DN50 | 165 mm | 22.3 mm | 127 mm | 8 | 19 mm | 6.5 kg✔ (≤50kg) |
| 2-1/2" | DN65 | 190 mm | 25.4 mm | 149 mm | 8 | 22 mm | 9.8 kg✔ (≤50kg) |
| 3" | DN80 | 210 mm | 28.6 mm | 168.5 mm | 8 | 22 mm | 13.5 kg✔ (≤50kg) |
| 4" | DN100 | 254 mm | 31.8 mm | 200 mm | 8 | 22 mm | 21 kg✔ (≤50kg) |
| 6" | DN150 | 318 mm | 36.6 mm | 269.5 mm | 12 | 22 mm | 37 kg✔ (≤50kg) |
| 8" | DN200 | 381 mm | 41.3 mm | 330 mm | 12 | 25 mm | 49 kg✔ (≤50kg) |
Available Metallurgical Grades
- ASTM A105 Carbon Steel — 100% heat batch tracked with full chemical and mechanical certification.
- ASTM A350 LF2 — 100% heat batch tracked with full chemical and mechanical certification.
- SS 316 / 316L — 100% heat batch tracked with full chemical and mechanical certification.
- SS 304 / 304L — 100% heat batch tracked with full chemical and mechanical certification.
- Alloy Steel F11 / F22 — 100% heat batch tracked with full chemical and mechanical certification.
Primary Engineering Applications
- Superheated Steam Headers
- Sour Crude Gathering
- Chemical Reactor Loops
- LNG Liquefaction Plants
Rajkot Facility Manufacturing & Global Logistics Corridors
This component is hot-forged on high-speed closed-die friction presses and CNC finished at our Rajkot manufacturing center located at Plot No. 42/43, GIDC Industrial Estate, Rajkot, Gujarat - 360002, India. Global ocean freight dispatches weekly via Port Mundra (240 km) and Port Kandla (230 km) with rapid transit to Houston USA, Rotterdam Europe, and Dubai UAE.
Related Flange Standards & Pressure Ratings
ASME B16.5 Class 150 Weld Neck Flange Dimensions & Weight
Weight: Up to 50 kg max
ASME B16.5 Class 600 Weld Neck Flange Dimensions & Weight
Weight: Up to 50 kg max
ASME B16.5 Class 900 Weld Neck Flange Dimensions & Weight
Weight: Up to 50 kg max
ASME B16.5 Class 1500 Weld Neck Flange Dimensions & Weight
Weight: Up to 50 kg max
ASME B16.5 Class 2500 Weld Neck Flange Dimensions & Weight
Weight: Up to 50 kg max
ASME B16.5 Class 150 Slip-On Flange Dimensions & Weight
Weight: Up to 50 kg max
Frequently Asked Questions: ASME B16.5 Class 300 Weld Neck Flange Dimensions & Weight
Class 300 flanges have thicker bodies, larger bolt circle diameters, and more bolt holes, allowing them to withstand 740 psi at ambient compared to 285 psi for Class 150.
Yes, Jayesh Forge produces Class 300 flanges in SS 304, SS 304L, SS 316, SS 316L, and Duplex F51 up to 50 kg per piece.
Every shipment includes an EN 10204 Type 3.1 Mill Test Certificate (MTC) with full chemical analysis, mechanical tensile/yield tests, and 100% Level II Ultrasonic Examination.