The pittsburgh lock seam fig.
Snap lock pittsburgh lock sheet metal fitting.
The radius button lock machine is the way to go.
This seam is used as a lengthwise seam at comers of square and rectangular pipes and elbows as well as fittings and ducts.
When it comes to rectangular duct the pittsburgh lock is considered the longitudinal seam in commercial ductwork.
It s then hammered into the female seam of the pitts which is run on both longitudinal sides of the heel to complete the pitts lock on a radius elbow.
Two piece duct showing the 5 16 pocket of the female pittsburgh and the 7 32 right angle flange of the male pittsburgh.
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.
A radius elbow consists of 2 cheeks these are the sides of the fitting and it s on the top part of this cheek that the right angle flange is turned at a 90ยบ angle.
After one piece is inserted in the pocket the tail in hammered over to close the lock.
Commonly used in the hvac industry roofing industry 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.
Snap lock button lock is for sure the best way to go.
2 69 is a comer lock seam.
The common type of longitudinal seam is the pittsburgh lock seam.
If you need to feed lots of metal to a rollformer consider using an uncoiler.
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.
Even for radius fittings.
The male seam is a button the female seam is a lock and the two snap together for a flush corner.
Machines used in high volume applications to form metal by running material through rollsets which progressively change the shape or profile.
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.
Provide custom shapes and industry standard shapes such as pittsburgh snap lock button lock standing seam etc.
Puts the flange and dimple in at the same time.
You put the flange on the same way as the pittsburg cept you need a longer flange.
Button snap lock and s clip need 9 sets of roller dies.
