Its big advantage is that no additional hammer over operation is required with a direct result of less labor cost in assembly.
Snap lock pittsburgh lock sheet metal fitting.
This seam is used as a lengthwise seam at comers of square and rectangular pipes and elbows as well as fittings and ducts.
After one piece is inserted in the pocket the tail in hammered over to close the lock.
Provide custom shapes and industry standard shapes such as pittsburgh snap lock button lock standing seam etc.
Figure 2 69 shows a cross section of the two pieces of metal to be joined and a cross section of the finished seam.
Two piece duct showing the 5 16 pocket of the female pittsburgh and the 7 32 right angle flange of the male pittsburgh.
Snap lock button lock is for sure the best way to go.
7 snap lock technology galvanized pipe round and oval 14 pipe 16 pipe 18 pipe 20 pipe 24 pipe 12 pipe 10 pipe 9 pipe length gauge item 2 24 140209.
The radius button lock machine is the way to go.
The common type of longitudinal seam is the pittsburgh lock seam.
Even for radius fittings.
Commonly used in the hvac industry roofing industry etc.
Originally formed in the brake or press brake today roll forming machines are used to form the pocket on one piece and the flange on the other piece.
2 69 is a comer lock seam.
Pittsburgh lock drive cleat and acme double seam are made on a machine with at least 5 sets of roller dies.
These machines can form 0 4 to 1 2 mm sheet metal into female locks on the inboard and button punched right angle flanges on outboard rolls at speeds of 18m min and are available in seven and nine forming station machines.
The pittsburgh lock seam fig.
Machines used in high volume applications to form metal by running material through rollsets which progressively change the shape or profile.
You put the flange on the same way as the pittsburg cept you need a longer flange.
Puts the flange and dimple in at the same time.
The button punch snap lock is used in the same way as the pittsburgh lock for joining comer sections of sheet metal.
Button snap lock and s clip need 9 sets of roller dies.
The male seam is a button the female seam is a lock and the two snap together for a flush corner.
To form elbows use a manual or powered right angle flanger and slip rolls.
If you need to feed lots of metal to a rollformer consider using an uncoiler.
