What bolt torque is required for Class 900 blind flanges?

ASME B16.5Class 900#Blind (BL)Capacity: Strictly Up to 50 kg

ASME B16.5 Class 900 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 2220 psi @ 100°F (153.1 bar ambient), adhering to EN 10204 3.1 and ISO 9001:2015 quality requirements.

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Rajkot, Gujarat (IN-GJ 22.2597° N, 70.8123° E)

Deep-Water Port Mundra (240 km) & Port Kandla (230 km)

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ASME B16.5 Class 900 Blind Flanges seal 2220 psi pipelines. Drop forged in Rajkot up to 50 kg per piece for deep-sea manifolds and severe petrochemical crackers.

StandardASME B16.5

Pressure Rating2220 psi @ 100°F (153.1 bar ambient)

Facing Finish1/4" Raised Face / RTJ

Max Unit WeightUp to 50 kg max

ASME B16.5 Class 900 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.

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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	121 mm	22.3 mm	82.5 mm	4	22 mm	3.4 kg✔ (≤50kg)
1"	DN25	149 mm	28.6 mm	101.5 mm	4	25 mm	6.8 kg✔ (≤50kg)
2"	DN50	216 mm	38.1 mm	165 mm	8	25 mm	17.5 kg✔ (≤50kg)
3"	DN80	241 mm	38.1 mm	190.5 mm	8	25 mm	26 kg✔ (≤50kg)
4"	DN100	292 mm	44.5 mm	235 mm	8	32 mm	49 kg✔ (≤50kg)

Engineering Note: Weights shown reflect standard carbon steel (ASTM A105, density 7.85 g/cm³). For Stainless Steel (304L/316L, density 8.00 g/cm³) or Duplex 2205 (7.80 g/cm³), multiply nominal weight by the metallurgical density ratio. All Jayesh Forge production strictly maintains our 50 kg max piece limit.

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.
A350 LF2 — 100% heat batch tracked with full chemical and mechanical certification.

View complete metallurgy & EN 10204 3.1 inspection protocols

Primary Engineering Applications

High-Pressure Isolation Valves
Wellhead Manifold Endcaps
Sour Gas Separators

Inquire about custom machining or special facings (RTJ/Tongue-Groove)

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.

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