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ASME / ASTM / API Flanges

We at rff supply ASME flanges in all shapes and designs according to any technical standard. Our stock and delivery programme is tailored to match a wide variety of needs.

Apart from common ASME B 16.5 flanges, we also provide weld neck and blind flanges larger than 24 inches according to ASME B 16.47. We also provide special flanges according to ASME B 16.36 and 16.48 as well as BS 3293 and API 6A. Whether you need a standard design from stock or bespoke flange prefabrication, we at rff will find an ideal solution to fit your requirements.

Designs and standards

Standardised ASME flanges are diverse. We would therefore recommend that you enquire about dimensions and pressure ratings available in our supply range. We supply all common standardised flanges according to ASME B 16.5 and 16.47 as well as ASME B 16.36 and 16.48.

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Flanges acc. to ASME B 16.5 / 16.47 Pressure ratings Dimensions rff+ Datasheets
Weld Neck Flanges / WN Class 150 to 2500    
  Class 150
Class 300
Class 400
Class 600
Class 900
Class 1500
Class 2500
1/2" - 24"
1/2" - 24"
4" - 24"
1/2" - 24"
3" - 24"
1/2" - 24"
1/2" - 12"
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Slip-on Flanges / SO Class 150 to 1500    
  Class 150
Class 300
Class 400
Class 600
Class 900
Class 1500
1/2" - 24"
1/2" - 24"
4" - 24"
1/2" - 24"
3" - 24"
1/2" - 2 1/2"
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Lap Joint Flanges / LJ Class 150 to 1500    
  Class 150
Class 300
Class 400
Class 600
Class 900
Class 1500
Class 2500
1/2" - 24"
1/2" - 24"
4" - 24"
1/2" - 24"
3" - 24"
1/2" - 24"
1/2" - 12"
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Blind Flanges / BL Class 150 to 1500    
  Class 150
Class 300
Class 400
Class 600
Class 900
Class 1500
Class 2500
1/2" - 24"
1/2" - 24"
4" - 24"
1/2" - 24"
3" - 24"
1/2" - 24"
1/2" - 12"
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Threaded Flanges / TH Class 150 to 1500    
  Class 150
Class 300
Class 400
Class 600
Class 900
Class 1500
Class 2500
1/2" - 24"
1/2" - 24"
4" - 24"
1/2" - 24"
3" - 24"
1/2" - 2 1/2"
1/2" - 2 1/2"
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Socket Welding Flanges / SW Class 150 to 1500    
  Class 150
Class 300
Class 600
Class 1500
1/2" - 3"
1/2" - 3"
1/2" - 3"
1/2" - 2 1/2"
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 Flanges acc. to ASME B 16.47 Series A Pressure ratings    
Weld Neck / Blind Flanges RF




Weld Neck / Blind Flanges RTJ
Class 150
Class 300
Class 400
Class 600
Class 900
Class 300
Class 400
Class 600
Class 900
26" - 60"
26" - 60"
26" - 60"
26" - 60"
26" - 48"
26" - 36"
26" - 36"
26" - 36"
26" - 36"
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Flanges acc. to ASME B 16.47 Series B Pressure ratings    
Weld Neck / Blind Flanges RF Class 75
Class 150
Class 300
Class 400
Class 600
Class 900
26" - 60"
26" - 60"
26" - 60"
26" - 36"
26" - 36"
26" - 36"
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Other Flanges according to    
Long Welding Neck Flanges
Reduced Threaded / Slip on Flanges
Orifice Flanges
Line Blanks
Weld Neck / Slip on Flanges
ASME B 16.5
ASME B 16.5
ASME B 16.36
ASME B 16.48
B.S. 3293 / API 6A
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General information

Information on Flanges acc. to ASME rff+ Datasheets
Overview and tolerances    
General overview  
Tolerances
Pressure ratings, dimensions and facings
General overview
Tolerances
B 16.5
B 16.5
B 16.5
B 16.47 Serie A/B
B 16.47 Serie A/B
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Facings and Screws    
Dimensions RTJ (Ring Type Joint) 
Tongue and groove / Male and female faching
Length of bolts
B 16.5
B 16.5
B 16.5
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Conversion table / Inch    
to millimetres / fractional values / decimal number   Download
Materials    
List of materials B 16.5 / 16.47 Download

Material grades

The range of standard materials is extensive. This is a selection of unalloyed, alloyed heat-resistant, low-temperature, fine-grain structural steel and stainless steel material grades that are common and available.

Material selection Material groups
A/SA105 / C21, P250GH, P280GH Unalloyed heat-resistant
A/SA 182 Grade F5, F9, F11, F12, F22, F91 Alloyed heat-resistant
A/SA 350 Grade LF2, P355QH1 Low-temperture
A/SA 694 Grade F52, F60, F65 Fine grain steel
A/SA 182 Grade F304/L, F321/H, F316/L Stainless steel
1.4301/1.4307, 1.4541. 1.4401/1.4404, 1.4571 Stainless steel
F51 (Duplex), F53 (Superduplex) Duplex / Superduplex
Special Alloys Special steel

Dimensions

The individual standards provide for a wide variety of options. Availability of individual flange types and designs is limited - please request in advance.

Processing and modification

We have a processing service certified by TÜV to turn, drill (flat or threaded), blast, coat or mark flanges according to ASME/ASTM for any requirement according to customer specification.

Products compatible with our ASME flanges

Product catalogues

Refer to our media centre for more details on pipes, flanges, butt weld fittings and pipe equipment according to DIN, EN and ASME.

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DIN EN / Pipes

DIN EN / Pipes

Impressive variety

Seamless and welded pipes for pressure purposes according to DIN EN 10216 and 10217, precision steel pipes according to DIN EN 10305, and line pipes according to DIN EN ISO 3183

DIN EN / DIN Flanges

DIN EN / DIN Flanges

Tailor-made and individual

With a extensive range of flanges according to DIN and EN 1092-1, we cover the entire range of PED.