ASME B16.5 Class 300 Blind 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 Blind Flanges seal medium-to-high pressure lines up to 740 psi. Precision drop forged with unbroken grain flow up to 50 kg per piece at Rajkot for petrochemical pipelines and refinery towers.
ASME B16.5 Class 300 Blind 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 | 1.3 kg✔ (≤50kg) |
| 1" | DN25 | 124 mm | 17.5 mm | 89 mm | 4 | 19 mm | 2.5 kg✔ (≤50kg) |
| 2" | DN50 | 165 mm | 22.3 mm | 127 mm | 8 | 19 mm | 5.6 kg✔ (≤50kg) |
| 3" | DN80 | 210 mm | 28.6 mm | 168.5 mm | 8 | 22 mm | 12 kg✔ (≤50kg) |
| 4" | DN100 | 254 mm | 31.8 mm | 200 mm | 8 | 22 mm | 20 kg✔ (≤50kg) |
| 6" | DN150 | 318 mm | 36.6 mm | 269.5 mm | 12 | 22 mm | 39 kg✔ (≤50kg) |
| 8" | DN200 | 381 mm | 41.3 mm | 330 mm | 12 | 25 mm | 50 kg✔ (≤50kg) |
Available Metallurgical Grades
- ASTM A105 — 100% heat batch tracked with full chemical and mechanical certification.
- SS 316L — 100% heat batch tracked with full chemical and mechanical certification.
- SS 304L — 100% heat batch tracked with full chemical and mechanical certification.
- A350 LF2 — 100% heat batch tracked with full chemical and mechanical certification.
- Duplex F51 — 100% heat batch tracked with full chemical and mechanical certification.
Primary Engineering Applications
- Refinery Column Manways
- Steam Boiler Cleanout Ports
- Chemical Distribution Headers
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 300 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
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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
Frequently Asked Questions: ASME B16.5 Class 300 Blind Flange Dimensions & Weight
Blind flanges are solid discs without a center bore and carry the entire pressure load across their surface, requiring heavy plate thickness to prevent bowing.