Class 150 Flange Dimensions in MM (PDF) – Complete Size Chart & Standards

  Class 150 flanges are the most commonly used flanges in industrial and commercial pipeline systems. They are suitable for low to moderate pressure applications and conform to ANSI/ASME B16.5 standards. In this article, we’ll provide a complete Class 150 flange dimensions chart in mm, key specifications, and download options in PDF format.

For high-quality Class 150 flanges in MS, GI, and SS, visit Udhhyog — one of the leading flange manufacturers and suppliers in Delhi.

What is a Class 150 Flange?

A Class 150 flange refers to the pressure rating of the flange — suitable for systems with pressure up to 150 psi at ambient temperature. It is commonly used for:

• 
  
  Water pipelines

• HVAC systems

• Oil & gas distribution

• Industrial processing units

Standards Followed: ANSI B16.5, IS 1538, ASTM A105, A182, etc.

Class 150 Flange Dimensions Chart (MM)

Nominal Size (NB)	OD (mm)	Bolt Circle (mm)	No. of Bolts	Bolt Hole Dia (mm)	Flange Thickness (mm)
15 mm (1/2")	89	60.3	4	15.9	11.2
20 mm (3/4")	98.4	69.9	4	15.9	12.7
25 mm (1")	108	79.4	4	15.9	14.2
40 mm (1-1/2")	127	98.4	4	15.9	15.7
50 mm (2")	152.4	120.6	4	19.1	17.5
80 mm (3")	190.5	152.4	4	19.1	20.6
100 mm (4")	228.6	190.5	8	19.1	22.2
150 mm (6")	279.4	241.3	8	22.2	25.4

📥 Download PDF Chart: Udhhyog Class 150 Flange Dimensions PDF

Available Flange Types in Class 150

• Blind Flange

• Weld Neck Flange

• Socket Weld Flange

• Slip-On Flange

• Lap Joint Flange

Materials offered:

• Mild Steel (MS)

• Galvanized Iron (GI)

• Stainless Steel (SS 304 / SS 316)

Pressure & Temperature Ratings

Class	Pressure Rating (psi)	Temp (°C)
150	~150 psi	Up to 200°C

Tip: Always consider gasket material, bolt rating, and flange face (RF or FF) for accurate system design.

Where to Buy Class 150 Flanges in Delhi?

Udhhyog is a leading supplier and manufacturer offering:

• Fast dispatch across Delhi NCR, Punjab, Haryana, UP, Rajasthan, J&K

• Custom sizes & drilling as per client drawings

• Full documentation with pressure test & dimension reports

📞 Call now or visit our product page: https://udhhyog.com/flange

FAQs

Q1: What is the bolt hole size for a 4-inch Class 150 flange?
A: It is 19.1 mm as per ASME B16.5 standard.

Q2: Can I use Class 150 flanges for steam lines?
A: For low-pressure steam (under 150 psi), yes. For high pressure, use Class 300 or 600.

Q3: Where to get Class 150 flange dimensions PDF?
A: Download it from Udhhyog Flange Page.