

Items 280124.N (stop on left) and 280126.N (stop on right): Siegmund Stop and Clamping Square 300 GK, nitrided, for System 28 welding tables with Ø28 mm bores. Made from GGG40 ductile cast iron, it is designed for heavy parts, works as a stop or a table extension, and Siegmund recommends ordering it in pairs. BTH Sales is the exclusive Canadian importer of Siegmund.
Specifications
| Siegmund article | 280124.N (siegmund.com) | 280126.N (siegmund.com) |
|---|---|---|
| Description | Stop and Clamping Square 300 GK left nitrided | Stop and Clamping Square 300 GK right nitrided |
| System | Siegmund System 28 (Ø28 mm bores, 100 mm grid) | |
| Length | 280 mm (11.02 in) | |
| Width | 95 mm (3.74 in) | |
| Height | 300 mm (11.81 in) | |
| Material thickness | 27 mm (1.06 in) | |
| Weight | 12.9 kg (28.44 lb) | |
| Finish | Nitrided | |
| Stop side | Left | Right |
| Material | GGG40 ductile cast iron | |
| Scale | Fine scale, standard | |
| GTIN | 4251805920864 | 4251805920871 |
Related products & accessories
-
Siegmund System 16 & 28 - Anti-Splatter
From $38.00
-
Siegmund System 16 & 28 - Clean Basic
From $32.00
-
Siegmund System 16 & 28 - Ground Connection Comfort
$104.00
-
Siegmund System 28 - Stop and Clamping Square 500 GK
$666.00
-
Siegmund System 28 - Stop and Clamping Square 600 GK
$808.00
-
Siegmund System 28 - Stop and Clamping Square 300 G
$342.00
Compatibility
- Fits: Siegmund System 28 welding tables and tooling with Ø28 mm bores on a 100 mm grid. Siegmund System 28 accessories also fit other 28 mm system welding tables with Ø28 mm bores on a 100 mm grid. Compatible tables from other manufacturers are often made from different materials and to different standards, so quality varies by manufacturer, compared with Siegmund's X8.7 tool steel.
- Siegmund System 28: fits every System 28 Siegmund table, including the Professional Extreme 8.7 and 8.8 PLUS tables listed on bthsales.ca; on a System 16 table it needs Siegmund's Reduction Bushing 28->16 (000546, suits boreholes and elongated holes) with System 16 bolts, or the Combination Fast Clamping Bolt 28->16 (000520); neither is listed on bthsales.ca.
- Works with: other Siegmund System 28 clamps, bolts, stops, squares and U-squares on the same table.
- Care & grounding: anti-spatter spray, CleanBasic cleaner, Ground Connection Comfort (S16/S28).
What's included
Choose one option; each option is one piece:
- 1 x Siegmund Stop and Clamping Square 300 GK left nitrided (280124.N)
- 1 x Siegmund Stop and Clamping Square 300 GK right nitrided (280126.N)
Engineering support & demos
Engineering support comes with your purchase: fixture design, layout drawings, CAD and 3D models, site visits and cobot cell planning, handled by Travis Hardcastle at BTH Sales or by Siegmund directly. BTH Sales does not sell cobots; for cobot cells we help with table integration and fixturing (see cobot welding with Siegmund tables). Live demos at our St. Marys showroom are by appointment (book a demo), and we offer video demos if you are outside Ontario. BTH Sales is family-owned, founded in 2001, and has been the exclusive Canadian importer of Siegmund since 2018.
Typical uses
- Three-dimensional stopping and clamping of heavy components; Siegmund designed the 300 GK specifically for heavy parts.
- Table extension: Siegmund says it serves both as a stop and as a table extension.
- Siegmund describes System 28 as ideal for light to heavy components and designed for maximum clamping forces, multi-ton structures and high distortion forces.

Industries served: Siegmund's published practical examples show its welding tables and tooling in these sectors: Agriculture; Interior; Lighting and electrical engineering; Machine tools and plant construction; Measurement and testing technology; Motorcycle engineering; Revolving door systems; Robotic technology; Stage technology; Stainless steel processing; Steel, sheet metal and metal construction; Textile production; Train Construction; Vehicle construction; Welding technology; Woodworking.
Frequently Asked Questions
Do I need the left or the right version?
The two versions differ only in which side the stop is on: 280124.N has the stop on the left and 280126.N on the right. Siegmund lists the same size (280 x 95 x 300 mm, 27 mm material thickness) for both and recommends ordering this square in pairs.
Can the 300 GK square be used as a table extension?
Yes. Siegmund says the Stop and Clamping Square 300 GK serves both as a stop and as a table extension, and that it was specifically designed for heavy parts, so it is made from GGG40 ductile cast iron for maximum stability.
Will it fit other 28 mm welding tables?
Yes, if the table has Ø28 mm bores on a 100 mm grid. Check the bore diameter and grid before ordering. Compatible tables from other manufacturers are often made from different materials and to different standards, so quality varies by manufacturer, compared with Siegmund's X8.7 tool steel.
Related parts
- System 28 Stop and Clamping Square 500 GK
- System 28 Stop and Clamping Square 600 GK
- System 28 Stop and Clamping Square 300 G
- System 28 bolts
- All Siegmund System 28 squares
Ships across Canada from 5 Industrial Rd, St. Marys, ON N4X 1G2, or pick up from our warehouse. Email sales@bthsales.ca or call +1-519-461-1381 with questions or for a freight quote.





