Siegmund System 28 Square U-Shape
Siegmund System 28 Square U-Shape blocks extend a 28 mm welding table sideways or upward, and connect two welding tables. Siegmund makes them in 200x100, 200x200, 400x200 and 400x400 cross-sections from 100 mm to 4000 mm long, plus elongated-hole and Premium Light versions; this collection also holds the System 28 clamping rails and clamping blocks. These System 28 parts also fit other 28 mm system welding tables with Ø28 mm bores on a 100 mm grid. Exclusive Canadian importer of Siegmund. Ships across Canada from St. Marys, ON.
Compare System 28 Square U-Shape sizes
| Series | Cross-section (mm) | Lengths in mm (item numbers) | Notes (per Siegmund) |
|---|---|---|---|
| Square U-Shape 200x100 | 200 × 100 | 500 (280310.P), 1000 (280320.P), 1500 (280330.P), 2000 (280340.P) | Table extension, vertical setups, connection between two tables; 100 mm grid lines |
| Square U-Shape 200x100, elongated hole | 200 × 100 | 500 left (280311.P), 500 right (280312.P), 1000 left (280321.P), 1000 right (280322.P) | Works like the 200x100 with additional elongated holes |
| Square U-Shape 200x200 | 200 × 200 | 100 (280396.P), 200 (280396.1.P), 500 (280360.P), 1000 (280370.P), 1500 (280380.P), 2000 (280390.P), 2400 (280391.P), 3000 (280392.P), 4000 (280394.P) | Boreholes on five sides, optional diagonal hole arrangement |
| Square U-Shape 200x200, special sizes | 200 × 200 | 600 (280362.P), 800 (280366.P), 1200 (280374.P), 1400 (280378.P), 1600 (280382.P), 1800 (280386.P) | Same cross-section as the 200x200 series |
| Square U-Shape 400x200 | 400 × 200 | 500 (280360.2.P), 1000 (280370.2.P), 1200 (280374.2.P), 1500 (280380.2.P), 2000 (280390.2.P), 2400 (280391.2.P), 3000 (280392.2.P), 4000 (280394.2.P) | Boreholes on five sides, optional diagonal hole arrangement |
| Square U-Shape 400x400 | 400 × 400 | 500 (280360.3.P), 1000 (280370.3.P), 1200 (280374.3.P), 1500 (280380.3.P), 2000 (280390.3.P), 2400 (280391.3.P), 3000 (280392.3.P), 4000 (280394.3.P) | For superstructures and heavy workpieces; diagonal grid on request |
| Square U-Shape Premium Light | 200 × 200 | 500 (800360.P), 1000 (800370.P), 1500 (800380.P), 2000 (800390.P) | See product pages |
| Clamping Rail | 100 × 100 | 1000 / 2000 / 3000 (280303.P, 280303.1.P, 280303.2.P) | Compact connection element; boreholes 100 mm apart |
| Clamping Block | 400 × 350 × 200 | 280285.P; Support and Clamping Frame 300x200x100 right / left 280300.N / 280301.N | Five-sided clamping cube with 50 mm borehole grid |
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Frequently Asked Questions
How is a Square U-Shape fastened to the welding table?
Siegmund says the Square U-Shape is firmly mounted to the table with connecting bolts (Siegmund item 280563). Fast clamping, universal, flush mount and positioning bolts must not be used to connect tables and Square U-Shapes; see the System 28 Bolts collection for connecting bolts.
Does a long Square U-Shape need a table leg?
Yes, when it is used as a table extension longer than 1000 mm, Siegmund says it has to be supported by a table leg. From a length of 500 mm all Square U-Shapes have mounting holes on the back for table legs (except 280310.P), and with legs item 280371 they can be used on foundation rails.
Which cross-section should I choose?
Siegmund describes the 200x100, 200x200 and 400x200 as table extensions for vertical setups and sturdy connections between two welding tables, and the 400x400 for superstructures and heavy workpieces. The elongated-hole 200x100 versions work like the standard 200x100 with additional elongated holes for more flexibility.
What are the grid lines on the Square U-Shape for?
Siegmund marks grid lines at 100 mm spacing on the System 28 Square U-Shape to make orientation easier. Boreholes on five sides and the optional diagonal hole arrangement give clamping and combination options with other squares and stops.
