Flanges Specifications

The specifications of Flanges, including size, material and standard, are listed in the table given below.

Parameter Aggregated Details
Standard ASME B16.5, ASME B16.47
Type WN, SO, BL, SW, LJ, TH, LWN, Orifice, Spectacle Blind, Reducing, Puddle
Size NPS 1/2" to NPS 60" (DN 15 to DN 1500)
Pressure Rating Class 150, 300, 600, 900, 1500, 2500; PN 6 to PN 100
Face Type RF, FF, RTJ, Tongue & Groove, Male & Female
Material Carbon Steel (A105), Stainless Steel (A182), Alloy Steel, Duplex, Nickel Alloys (B564)
Finish Forged, Machined, Anti-Rust Oil Coated, Hot-Dip Galvanised

Flanges Sizes

We supply pipe flanges from NPS 1/2" to NPS 60" under ASME B16.5 and ASME B16.47.

Standard NPS Range Pressure Class / Series Special Notes
ASME B16.5 1/2" to 24" Class 150, 300, 600, 900, 1500, 2500 Socket Weld: up to NPS 3"; Threaded: up to NPS 4"
ASME B16.47 26" to 60" Series A (MSS SP-44), Series B (API 605) Large diameter flanges

Flange Pressure Classes

Flange pressure classes show how much pressure and temperature a flange can safely handle in different piping systems.

ASME Class Approx. PN Rating
Class 150 PN 10 / PN 16
Class 300 PN 25 / PN 40
Class 600 PN 63 / PN 100
Class 900 —
Class 1500 —
Class 2500 —

Flanges Price

In India, flange prices are usually about Rs 180–250 per kg or USD 2.2–3.0 per kg. The exact price depends on the flange type, size, material grade, pressure class, required certificates, how many you order, and current raw material and shipping costs.

Flange Material

Sachiya Steel International provides flanges in the materials listed below.

  • Stainless Steel
  • Duplex Steel
  • Super Duplex Steel
  • Carbon Steel
  • Mild Steel
  • Alloy Steel
  • Inconel
  • Hastelloy
  • Monel
  • Titanium
  • Copper-Nickel

ANSI B16.5 and DIN flanges share dimensional principles, though pressure-temperature ratings differ.

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Flanges Standards

Major flange standards are used worldwide, by country, to ensure pipes fit together properly and operate safely in global projects.

Country / Region Standard Designation
USA (ASME) ASME B16.5, ASME B16.47
USA (API) API 6A, API 605
Europe (EN) EN 1092-1
Germany (DIN) DIN 2527-2637 series
UK (BS) BS 4504, BS 10 (Table D, E, F, H)
Japan (JIS) JIS B2220, JIS B2238
India (IS) IS 6392
China (GB) GB/T 9112, GB/T 9115, GB/T 9119
Russia (GOST) GOST 12820, GOST 12821
Australia (AS) AS 2129, AS 4087

ANSI B16.5 and DIN flanges share dimensional principles, though pressure-temperature ratings differ.

Types of Flanges

We supply various flange types per ASME B16.5 and ASME B16.47: weld neck, slip-on, blind, socket weld, lap joint, threaded, orifice, spectacle blind, reducing, and puddle flanges.

Weld Neck Flange

Weld Neck Flanges (WN / WNRF / WNRTJ)

Slip On Flange

Slip-On Flanges (SO / SORF / SOFF)

Blind Flange

Blind Flanges (BL / BLRF / BLRTJ)

Socket Weld Flange

Socket Weld Flanges (SW)

Lap Joint Flange

Lap Joint Flanges (LJ)

Threaded Flange

Threaded Flanges (Screwed / TH)

Orifice Flange

Orifice Flanges

Spectacle Blind Flange

Spectacle Blind, Spade, and Spacer

Reducing Flange

Reducing & Expander Flanges

Puddle Flange

Puddle Flanges


Flange FaceTypes

Face finish determines gasket compatibility. The main types are Raised Face, Flat Face, Ring Type Joint, and speciality configurations.

  • Raised Face (RF)
    Raised Face is the most common flange face type and focuses the gasket pressure on a smaller area.
  • Flat Face (FF)
    Flat Face flanges have no raised surface and pair with cast iron flanges.
  • Ring Type Joint (RTJ)
    RTJ flanges use a metal ring gasket in a machined groove for a metal-to-metal seal, typically Class 900 and above.
  • Tongue and Groove (T&G) and Male and Female (MFM)
    Tongue and Groove flanges use a raised ring fitting into a matching groove. Male and Female flanges follow the same principle.

Flanges Industrial Applications

Flanges for pipes serve as bolted connections across multiple high-performing industries listed below.

Oil and Gas

API 6A and ASME B16.5 flanges are important parts used in wellhead equipment and refinery pipes to create strong, leak-tight connections.

Petrochemical and Chemical Processing

Stainless steel pipe flanges are designed to handle corrosive, acidic media and operate reliably in demanding, elevated-temperature process conditions.

Power Generation

Alloy steel flanges rated for temperatures above 400°C are used on boiler feed pipes and turbine exhaust lines in power plants.

Water and Wastewater Treatment

Puddle flanges and AWWA C207 flanges are used on pipelines in water supply systems and sewage plants.

Shipbuilding and Marine

Offshore platforms and ships use pipe flanges with corrosion-resistant coatings so they can withstand harsh seawater and marine conditions.

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Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect Flanges from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Plastic end caps on tube ends
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Pipe Bundle Yard Staging
Shipping packaging Container End-Cap Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies seamless tubes to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

  • USA flagUSA
  • Canada flagCanada

Frequently Asked Questions:

What are Flanges used for in piping systems?+
Flanges join pipes and equipment with bolted connections and gaskets, making it easy to take the system apart without cutting the pipes.
What are the main types of Pipe Flanges?+
Per ASME B16.5, the 6 standard types are weld neck, slip-on, blind, socket weld, lap joint, and threaded. Speciality types include orifice, spectacle blind, reducing, and puddle flanges.
What is the difference between SORF and WNRF Flanges?+
SORF flanges slide over the pipe with two fillet welds. WNRF flanges have a tapered hub butt-welded to the pipe for higher strength in high-pressure service.
What Flange pressure classes are available?+
Per ASME B16.5, flanges come in Class 150, 300, 600, 900, 1500, and 2500. European PN ratings run from PN 6 to PN 100.
What materials are Pipe Flanges available in?+
Pipe flanges come in carbon steel (ASTM A105), stainless steel (ASTM A182 F304, F316), alloy steel, duplex, and nickel alloys. We stock SS flanges and MS flanges for quick dispatch.
What is the difference between ASME B16.5 and ASME B16.47 Flanges?+
ASME B16.5 covers NPS 1/2" to 24". ASME B16.47 covers NPS 26" to 60" in Series A (MSS SP-44) and Series B (API 605).
What is the price of Flanges per piece?+
Carbon steel A105 flanges (NPS 1/2", Class 150) start from Rs 150 to Rs 300 per piece. Contact us for current pricing on all sizes.
What is the difference between RF and RTJ Flanges?+
RF flanges use flat or spiral-wound gaskets for standard service. RTJ flanges use a metal ring gasket in a machined groove for high-pressure sealing.
Contact Us for Flanges Availability and Delivery. Request a Quote