Slip-On Flat Face Flange. It means the face of the flange, the surface the physically touches the next flange is flat as opposed to raised (SORF Flange)
it is a flange that's it
No
Not. There's no way to connect a WNF to an RTJ flange.
Raised face flange end
If it's wide flange, it's from center of web to web distance. Other structural members, it's center of flange to center of flange.
Weld Neck Raised Face flange
To allow floor flange bolts to have a place to fit and to anchor the flange to the cement /wood decking
The term"counter flange" is used in Europe to refer to a mating flange to make up a flange pair. For example a "counter flange" attached to a pipe must have the same bolt circle diameter, number of bolts, and size of bolts and pressure rating at the equipment nozzle flange provided by an equipment manufacturer.
RJ flange is fabricated with a ring groove on the surface of the flange with the specification that has been set based on international standards.
depending on your type of flange and pipe and the damage of the flange, if you have a PVC flange with just the bolt slots busted then you can screw in new bolts to the floor below the flange and still use the flange but if its broken where the wax seal sits then if your flange is lower then the floor you can use a insert flange that fits inside your old toilet flange with thin walls to keep the pipe size maximum. To replace the entire flange can be a job especially if its in concrete or in a floor joist because most of the time you have no room and if its cast iron pipe it can be even more of headache but in order to replace the flange you need to cut it out to where you can reconnect the pipe and flange by using a fernco or a no hub band. Sometimes it is impossible to replace because the flange can be on all close fittings and you pretty much have to replace most of the plumbing drain pipe to replace it properly which is why you want to try repairing your toilet flange rather then replacing it .
It offsets the floor flange bolts by 2"