(3 Roller, 3 Single Belling Roller Type)
This is a Three Belling Roller Expander relating to the same applications as E, EL, A and 1A types.
To ascertain the correct tool number for your purposes, first establish the minimum bore which the tool enters (1 st column of table below). Then select the appropriate Seat Thickness column, and read off at the Minimum Bore size line … e.g.: for a tube with minimum bore size of 40mm and a seat thickness of 35mm, the tool number will read: 3A40/35.Intermediate range tools are available to special order.
Drum mandrels will be supplied unless header or short series mandrels are ordered.
Note: In all cases the effective parallel rolling lengths of these tools is 6mm longer than the seat thickness dimensions given in the tables. Where it is necessary to expand in seats which are thicker than those covered below, the recommended procedure for rolling in thick drums applies.