#flangesizechart

Mild Steel (MS) flanges are widely used in piping systems for water supply, gas distribution, oil & chemical transport, and HVAC systems. The IS 1538 standard governs the dimensions and technical specifications of MS flanges in India. This guide provides a detailed MS flange size chart as per IS 1538, pressure class info, and a downloadable reference.

For premium quality MS flanges with full compliance to IS 1538 standards, trust Udhhyog — one of the top MS flange suppliers and manufacturers in Delhi.

What is IS 1538 Standard?

IS 1538 (Part 1) is the Indian Standard that specifies dimensions, bolt hole pattern, thickness, and other features for cast iron and mild steel flanges used in piping.

Applicable flange types:

Slip-On Flange

Blind Flange

Weld Neck Flange

Threaded Flange

MS Flange Dimensions Chart as per IS 1538

NB SizeOD (mm)Thickness (mm)PCD (mm)No. of HolesHole Dia (mm)15 mm95126541420 mm105127541425 mm115148541440 mm1451611041850 mm1601612541880 mm20018160418100 mm22020180818150 mm28522240822

📥 Download Full Chart in PDF: Visit Udhhyog Flange Page

Available MS Flange Types at Udhhyog

Slip-On Flanges (SO Flange)

Weld Neck Flanges (WN Flange)

Blind Flanges

Threaded Flanges

Lap Joint Flanges

Material: Mild Steel (IS 2062 Grade) Size Range: 15mm to 600mm Pressure Class: PN6, PN10, PN16, Class 150

MS Flange Uses

💧 Water and wastewater pipelines

🛢️ Oil and gas lines

🏭 Chemical processing

🔥 Fire fighting systems

🌬️ HVAC ducting

Why Choose Udhhyog for MS Flanges?

✔️ IS 1538 Standard Compliance

✔️ High-quality MS with anti-rust coating

✔️ Custom flange drilling available

✔️ Serving Delhi, Punjab, UP, Rajasthan, Haryana, J&K, Himachal Pradesh

✔️ Bulk availability with prompt delivery

📞 Contact us at Udhhyog.com for custom quotes or technical support.

FAQs

Q1: What is IS 1538 used for? A: IS 1538 is the Indian standard for cast iron and mild steel flanges used in pipeline connections.

Q2: What pressure does a standard MS flange handle? A: Typically PN10 or PN16 depending on thickness and application.

Mild Steel (MS) flanges are widely used in piping systems for water supply, gas distribution, oil & chemical transport, and HVAC systems. The IS 1538 standard governs the dimensions and technical specifications of MS flanges in India. This guide provides a detailed MS flange size chart as per IS 1538, pressure class info, and a downloadable reference.

For premium quality MS flanges with full compliance to IS 1538 standards, trust Udhhyog — one of the top MS flange suppliers and manufacturers in Delhi.

What is IS 1538 Standard?

IS 1538 (Part 1) is the Indian Standard that specifies dimensions, bolt hole pattern, thickness, and other features for cast iron and mild steel flanges used in piping.

Applicable flange types:

Slip-On Flange

Blind Flange

Weld Neck Flange

Threaded Flange

MS Flange Dimensions Chart as per IS 1538

NB SizeOD (mm)Thickness (mm)PCD (mm)No. of HolesHole Dia (mm)15 mm95126541420 mm105127541425 mm115148541440 mm1451611041850 mm1601612541880 mm20018160418100 mm22020180818150 mm28522240822

📥 Download Full Chart in PDF: Visit Udhhyog Flange Page

Available MS Flange Types at Udhhyog

Slip-On Flanges (SO Flange)

Weld Neck Flanges (WN Flange)

Blind Flanges

Threaded Flanges

Lap Joint Flanges

Material: Mild Steel (IS 2062 Grade) Size Range: 15mm to 600mm Pressure Class: PN6, PN10, PN16, Class 150

MS Flange Uses

💧 Water and wastewater pipelines

🛢️ Oil and gas lines

🏭 Chemical processing

🔥 Fire fighting systems

🌬️ HVAC ducting

Why Choose Udhhyog for MS Flanges?

✔️ IS 1538 Standard Compliance

✔️ High-quality MS with anti-rust coating

✔️ Custom flange drilling available

✔️ Serving Delhi, Punjab, UP, Rajasthan, Haryana, J&K, Himachal Pradesh

✔️ Bulk availability with prompt delivery

📞 Contact us at Udhhyog.com for custom quotes or technical support.

FAQs

Q1: What is IS 1538 used for? A: IS 1538 is the Indian standard for cast iron and mild steel flanges used in pipeline connections.

Q2: What pressure does a standard MS flange handle? A: Typically PN10 or PN16 depending on thickness and application.

Mild Steel (MS) flanges are widely used in piping systems for water supply, gas distribution, oil & chemical transport, and HVAC systems. The IS 1538 standard governs the dimensions and technical specifications of MS flanges in India. This guide provides a detailed MS flange size chart as per IS 1538, pressure class info, and a downloadable reference.

For premium quality MS flanges with full compliance to IS 1538 standards, trust Udhhyog — one of the top MS flange suppliers and manufacturers in Delhi.

What is IS 1538 Standard?

IS 1538 (Part 1) is the Indian Standard that specifies dimensions, bolt hole pattern, thickness, and other features for cast iron and mild steel flanges used in piping.

Applicable flange types:

Slip-On Flange

Blind Flange

Weld Neck Flange

Threaded Flange

MS Flange Dimensions Chart as per IS 1538

NB SizeOD (mm)Thickness (mm)PCD (mm)No. of HolesHole Dia (mm)15 mm95126541420 mm105127541425 mm115148541440 mm1451611041850 mm1601612541880 mm20018160418100 mm22020180818150 mm28522240822

📥 Download Full Chart in PDF: Visit Udhhyog Flange Page

Available MS Flange Types at Udhhyog

Slip-On Flanges (SO Flange)

Weld Neck Flanges (WN Flange)

Blind Flanges

Threaded Flanges

Lap Joint Flanges

Material: Mild Steel (IS 2062 Grade) Size Range: 15mm to 600mm Pressure Class: PN6, PN10, PN16, Class 150

MS Flange Uses

💧 Water and wastewater pipelines

🛢️ Oil and gas lines

🏭 Chemical processing

🔥 Fire fighting systems

🌬️ HVAC ducting

Why Choose Udhhyog for MS Flanges?

✔️ IS 1538 Standard Compliance

✔️ High-quality MS with anti-rust coating

✔️ Custom flange drilling available

✔️ Serving Delhi, Punjab, UP, Rajasthan, Haryana, J&K, Himachal Pradesh

✔️ Bulk availability with prompt delivery

📞 Contact us at Udhhyog.com for custom quotes or technical support.

FAQs

Q1: What is IS 1538 used for? A: IS 1538 is the Indian standard for cast iron and mild steel flanges used in pipeline connections.

Q2: What pressure does a standard MS flange handle? A: Typically PN10 or PN16 depending on thickness and application.

 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 BoltsBolt Hole Dia (mm)Flange Thickness (mm)15 mm (1/2")8960.3415.911.220 mm (3/4")98.469.9415.912.725 mm (1")10879.4415.914.240 mm (1-1/2")12798.4415.915.750 mm (2")152.4120.6419.117.580 mm (3")190.5152.4419.120.6100 mm (4")228.6190.5819.122.2150 mm (6")279.4241.3822.225.4

📥 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

ClassPressure Rating (psi)Temp (°C)150~150 psiUp 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.

 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 BoltsBolt Hole Dia (mm)Flange Thickness (mm)15 mm (1/2")8960.3415.911.220 mm (3/4")98.469.9415.912.725 mm (1")10879.4415.914.240 mm (1-1/2")12798.4415.915.750 mm (2")152.4120.6419.117.580 mm (3")190.5152.4419.120.6100 mm (4")228.6190.5819.122.2150 mm (6")279.4241.3822.225.4

📥 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

ClassPressure Rating (psi)Temp (°C)150~150 psiUp 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.

 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 BoltsBolt Hole Dia (mm)Flange Thickness (mm)15 mm (1/2")8960.3415.911.220 mm (3/4")98.469.9415.912.725 mm (1")10879.4415.914.240 mm (1-1/2")12798.4415.915.750 mm (2")152.4120.6419.117.580 mm (3")190.5152.4419.120.6100 mm (4")228.6190.5819.122.2150 mm (6")279.4241.3822.225.4

📥 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

ClassPressure Rating (psi)Temp (°C)150~150 psiUp 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.

Stainless Steel (SS) flanges play a crucial role in industrial piping, chemical processing, and mechanical engineering. However, SS 304 and SS 316 have distinct characteristics that make them suitable for different applications. Understanding flange size charts, PCD charts, and pressure ratings will help in selecting the right stainless steel grade for your needs.

This guide includes:

What is SS 304 and SS 316?

Key differences between SS 304 and SS 316

Flange size chart and PCD chart comparison

Pressure ratings for SS 304 and SS 316 flanges

Why choose Udhhyog for premium stainless steel flanges?

What is SS 304?

SS 304 is an austenitic stainless steel composed of:

18% Chromium (Cr) – Provides corrosion resistance.

8% Nickel (Ni) – Enhances strength and durability.

Low Carbon Content – Improves weldability.

Advantages of SS 304:

✅ Good corrosion resistance in mild environments. ✅ Cost-effective and widely available. ✅ Ideal for general-purpose applications like food processing, kitchenware, and structural elements.

What is SS 316?

SS 316 is an upgraded version of SS 304 with the addition of molybdenum (Mo). It contains:

16-18% Chromium (Cr) – Provides oxidation and rust resistance.

10-14% Nickel (Ni) – Enhances strength and toughness.

2-3% Molybdenum (Mo) – Increases resistance to pitting and crevice corrosion.

Advantages of SS 316:

✅ Superior corrosion resistance in marine and acidic environments. ✅ High temperature and pressure tolerance. ✅ Commonly used in chemical plants, medical equipment, and marine structures.

Difference Between SS 304 and SS 316

FeatureSS 304SS 316Composition18% Chromium, 8% Nickel16% Chromium, 10% Nickel, 2% MolybdenumCorrosion ResistanceGoodExcellent, especially against chloride exposureStrengthHighSlightly higher than SS 304ApplicationsGeneral-purpose use, food industryMarine, chemical, and pharmaceutical industriesCostMore affordableSlightly expensive due to molybdenum content

SS 304 & SS 316 Flange Size Chart (in mm)

SS flanges follow ASME B16.5, ANSI, and DIN standards. Below is a stainless steel flange size chart.Nominal Pipe Size (NPS)Flange Outer Diameter (mm)Bolt Hole Diameter (mm)Number of Bolts2"1501943"1751944"2301986"280228100mm210198150mm280228

For a detailed dimensions chart and PDF download, visit Udhhyog.

SS Flange PCD Chart

PCD (Pitch Circle Diameter) refers to the diameter of the circle passing through the center of bolt holes. Below is a reference SS flange PCD chart.Flange SizePCD (mm)Bolt Hole Diameter (mm)2-inch120193-inch152194-inch190196-inch24122100mm21519150mm28022

Pressure Ratings for SS 304 and SS 316 Flanges

SS flange pressure ratings vary based on temperature and material composition. Below is a general pressure rating comparison.Flange ClassSS 304 Pressure Rating (PSI)SS 316 Pressure Rating (PSI)Class 150285290Class 300740750Class 6001,4801,500Class 9002,2202,250Class 15003,7053,750Class 25006,1706,200

Why Choose Udhhyog for SS Flanges?

✅ High-Quality SS 304 & SS 316 Flanges – Manufactured as per ASME, ANSI, and IS standards. ✅ Customization Available – Flanges tailored for industrial needs. ✅ Competitive Rates – Best pricing for bulk and custom orders. ✅ Reliable Supply Chain – Serving Delhi, Haryana, UP, and J&K.

For stainless steel flanges at competitive prices, trust Udhhyog – your reliable industrial supplier.

Conclusion

Both SS 304 and SS 316 flanges offer excellent performance, but SS 316 provides superior corrosion resistance, especially in marine and chemical environments. Understanding flange size charts, PCD charts, and pressure ratings helps in choosing the right material. Udhhyog supplies high-quality stainless steel flanges, from 2-inch to 150mm sizes, meeting Class 150 to Class 2500 standards.

Stainless Steel (SS) flanges play a crucial role in industrial piping, chemical processing, and mechanical engineering. However, SS 304 and SS 316 have distinct characteristics that make them suitable for different applications. Understanding flange size charts, PCD charts, and pressure ratings will help in selecting the right stainless steel grade for your needs.

This guide includes:

What is SS 304 and SS 316?

Key differences between SS 304 and SS 316

Flange size chart and PCD chart comparison

Pressure ratings for SS 304 and SS 316 flanges

Why choose Udhhyog for premium stainless steel flanges?

What is SS 304?

SS 304 is an austenitic stainless steel composed of:

18% Chromium (Cr) – Provides corrosion resistance.

8% Nickel (Ni) – Enhances strength and durability.

Low Carbon Content – Improves weldability.

Advantages of SS 304:

✅ Good corrosion resistance in mild environments. ✅ Cost-effective and widely available. ✅ Ideal for general-purpose applications like food processing, kitchenware, and structural elements.

What is SS 316?

SS 316 is an upgraded version of SS 304 with the addition of molybdenum (Mo). It contains:

16-18% Chromium (Cr) – Provides oxidation and rust resistance.

10-14% Nickel (Ni) – Enhances strength and toughness.

2-3% Molybdenum (Mo) – Increases resistance to pitting and crevice corrosion.

Advantages of SS 316:

✅ Superior corrosion resistance in marine and acidic environments. ✅ High temperature and pressure tolerance. ✅ Commonly used in chemical plants, medical equipment, and marine structures.

Difference Between SS 304 and SS 316

FeatureSS 304SS 316Composition18% Chromium, 8% Nickel16% Chromium, 10% Nickel, 2% MolybdenumCorrosion ResistanceGoodExcellent, especially against chloride exposureStrengthHighSlightly higher than SS 304ApplicationsGeneral-purpose use, food industryMarine, chemical, and pharmaceutical industriesCostMore affordableSlightly expensive due to molybdenum content

SS 304 & SS 316 Flange Size Chart (in mm)

SS flanges follow ASME B16.5, ANSI, and DIN standards. Below is a stainless steel flange size chart.Nominal Pipe Size (NPS)Flange Outer Diameter (mm)Bolt Hole Diameter (mm)Number of Bolts2"1501943"1751944"2301986"280228100mm210198150mm280228

For a detailed dimensions chart and PDF download, visit Udhhyog.

SS Flange PCD Chart

PCD (Pitch Circle Diameter) refers to the diameter of the circle passing through the center of bolt holes. Below is a reference SS flange PCD chart.Flange SizePCD (mm)Bolt Hole Diameter (mm)2-inch120193-inch152194-inch190196-inch24122100mm21519150mm28022

Pressure Ratings for SS 304 and SS 316 Flanges

SS flange pressure ratings vary based on temperature and material composition. Below is a general pressure rating comparison.Flange ClassSS 304 Pressure Rating (PSI)SS 316 Pressure Rating (PSI)Class 150285290Class 300740750Class 6001,4801,500Class 9002,2202,250Class 15003,7053,750Class 25006,1706,200

Why Choose Udhhyog for SS Flanges?

✅ High-Quality SS 304 & SS 316 Flanges – Manufactured as per ASME, ANSI, and IS standards. ✅ Customization Available – Flanges tailored for industrial needs. ✅ Competitive Rates – Best pricing for bulk and custom orders. ✅ Reliable Supply Chain – Serving Delhi, Haryana, UP, and J&K.

For stainless steel flanges at competitive prices, trust Udhhyog – your reliable industrial supplier.

Conclusion

Both SS 304 and SS 316 flanges offer excellent performance, but SS 316 provides superior corrosion resistance, especially in marine and chemical environments. Understanding flange size charts, PCD charts, and pressure ratings helps in choosing the right material. Udhhyog supplies high-quality stainless steel flanges, from 2-inch to 150mm sizes, meeting Class 150 to Class 2500 standards.