Metric or ISO flanges are classified in different types, according to the NF EN 1092-1 standard:
- type 32 : flat collars
- type 33 : thin pressed flanges
- type 34 : flanged collars
- type 35 : thick pressed collars
The American standard ANSI MSS SP-43 (from the Manufacturers Standardization Society of the Valve and Fittings Industry) sets the dimensions of the Stub End collars, used in low pressure ASME pipelines (up to Schedule 40S). The Type A offered on our site is for thin-walled stub ends.