Lockformer Transverse Duct Connector (TDC) T25a Rollformers

With Lockformer Transverse Duct Connector (TDC) Rollformers, you can roll form your own seal-able flanges on transverse duct joints during the fabrication process for both fittings and straight duct applications.

Introduced in 1982, the original Lockformer TDC Rollformer continues to be the only transverse duct connector machine on the market that produces rollformed flanges certified to have passed all the functional criteria tests from 1/2” W.G. to 10” W.G. to comply with SMACNA Duct Construction Standard (DCS) T-25a*. Today the Lockformer TDC T25A Rollformer is available in the original standard configuration with a capacity of 18-26ga steel at a speed 60 ft/min and our latest model which has a capacity of 16-24ga steel at a speed of 70 ft/min with optional inboard and  outboard roll sets.

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Lockformer TDC T25a 18ga

Lockformer TDC T25a 16ga


18ga - 26ga

16ga - 24ga

No. of Forming Stations



Shaft Diameter


1-1/4” Stress Proof

Vertical Center Distance



Horizontal Center Distance




60 ft/min

70 ft/min


7.5 H.P.3 Phase 230, 460V, 60 Cycle

10 H.P.3 Phase 208, 230, 460V, 60 Cycle


Heavy Duty Oil Bath Gear Reducer

Heavy Duty Oil Bath Gear Reducer


All Gear Drive coupled to Transmission with Heavy Duty Roller Chain

All Gear Drive coupled to Transmission with Heavy Duty Roller Chain


137” L x 38” W x 48” H — 2,800 lbs.

141” L x 35” W x 47” H — 3,500 lbs.

Optional Outboard Tooling

1-1/8” Standing Seam Rolls 20ga

1-1/4” Standing Seam Rolls 20ga

1-1/2” Standing Seam Rolls 20ga

TDC Clip Rolls 20ga

18ga Pittsburgh Rolls 1/2” Pocket

1-1/8” Standing Seam Rolls 16ga

1-1/4” Standing Seam Rolls 16ga

1-1/2” Standing Seam Rolls 16ga

TDC Clip Rolls 20ga

16ga Pittsburgh Rolls 1/2” Pocket

1-1/8” 18ga 3 in 1 Rolls

Optional Inboard Tooling

1-1/8” 20ga Standing S Cleat

1-5/8” 20-22ga Standing “S” Bar Slip

TDC Clip Roll Set

14ga 2x2 Angle

Optional Equipment

Variable Speed Frequency Drive

Industrial Hard Chrome Plating for TDC Rolls

Pendent Control

Lockformer Transverse Duct Connector (TDC) Roll Formers

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