How does a lap joint flange align during installation?

ASME B16.5Class 300#Lap Joint (LJ)Capacity: Strictly Up to 50 kg

ASME B16.5 Class 300 Lap Joint 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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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 300 Lap Joint Flanges pair with stub ends for 740 psi chemical processing. Forged in Rajkot up to 50 kg per piece for easy rotating bolt alignment.

StandardASME B16.5

Pressure Rating740 psi @ 100°F (51.1 bar ambient)

Facing FinishFlat Face with Machined Radius

Max Unit WeightUp to 50 kg max

ASME B16.5 Class 300 Lap Joint 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	95 mm	14.3 mm	66.5 mm	4	16 mm	1.2 kg✔ (≤50kg)
1"	DN25	124 mm	17.5 mm	89 mm	4	19 mm	2.2 kg✔ (≤50kg)
2"	DN50	165 mm	22.3 mm	127 mm	8	19 mm	5 kg✔ (≤50kg)
3"	DN80	210 mm	28.6 mm	168.5 mm	8	22 mm	10 kg✔ (≤50kg)
4"	DN100	254 mm	31.8 mm	200 mm	8	22 mm	16 kg✔ (≤50kg)
6"	DN150	318 mm	36.6 mm	269.5 mm	12	22 mm	30 kg✔ (≤50kg)
8"	DN200	381 mm	41.3 mm	330 mm	12	25 mm	48 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.
SS 304L — 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

Chemical Plant Acid Transport
Pulp & Paper Bleaching Lines
Offshore Water Desalination

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.

ASME Standards Committee View Rajkot Plant Location (Google Maps) Back to All 56 Flange Standards