Button Punch Snap Lock Rollformer Model BPSL 20
DUCTFAB Button Punch Snap Lock (BPSL) Seam Roll Former greatly simplifies ductwork assembly. The male seam is a button, the female seam is a lock and these snap together for a flush corner.
Female locks formed on the inboard side and button punched right angle flanges on outboard rolls on a nine forming station machine.
This is a more sophisticated joint than the Pittsburgh lock, requiring less labour.
When used in conjunction with the double-headed flanging machine, this makes possible the forming of round bends.
The machine is capable of forming a maximum of 20 swg (1.00mm).