Items 280657.1.N, 280658.E and 280659.PA: Siegmund Prism for Screw Clamps, System 28, nitrided, stainless steel or polyamide. It clamps round and square pipes, and because it sits on the ball head of the threaded arbor it moves to fit the workpiece precisely and pulls off for a quick change. BTH Sales is the exclusive Canadian importer of Siegmund.
Specifications
| Siegmund article | 280657.1.N (siegmund.com) | 280658.E (siegmund.com) | 280659.PA (siegmund.com) |
|---|---|---|---|
| Description | Prism for Screw Clamps nitrided | Prism for Screw Clamps Stainless Steel | Prism for Screw Clamps Polyamide |
| System | Siegmund System 28 (Ø28 mm bores, 100 mm grid) | ||
| Height | 24 mm (0.94 in) | 21 mm (0.83 in) | 24 mm (0.94 in) |
| Diameter | 40 mm (1.57 in) | ||
| Weight | 0.1 kg (0.22 lb) | 0.09 kg (0.20 lb) | 0.01 kg (0.02 lb) |
| Finish | Nitrided | – | – |
| Fits | Spindles with 16 mm ball diameter | ||
| GTIN | 4251805923292 | 4251805917925 | 4251805917932 |
Compatibility
- Fits: Siegmund System 28 welding tables and tooling with Ø28 mm bores on a 100 mm grid. It fits System 28 screw clamps with a 16 mm ball spindle, including clamps used on other 28 mm system welding tables with Ø28 mm bores. 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: a prism "for spindle with ball diameter 16 mm"; the nitrided and stainless versions are "compatible with 28 mm boreholes and clamps" and the polyamide version is "only suitable for clamps", so they go on the System 28 screw clamps listed on bthsales.ca.
- Not compatible: System 16 (Ø16 mm) tables; Siegmund builds each system around one bore size.
- 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 Prism for Screw Clamps nitrided (280657.1.N)
- 1 x Siegmund Prism for Screw Clamps Stainless Steel (280658.E)
- 1 x Siegmund Prism for Screw Clamps Polyamide (280659.PA)
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
- Clamping round and square pipes (Siegmund).
- Stainless steel for scratch-resistant metals (rust prevention); polyamide for scratch-prone surfaces (Siegmund).
- 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
Which prism material should I choose?
Siegmund offers nitrided (280657.1.N), stainless steel (280658.E) for scratch-resistant metals to prevent rust, and polyamide (280659.PA) for scratch-prone surfaces.
How do I change the prism?
Siegmund says the prism is replaced by simply taking it off the ball head of the threaded arbor.
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 Pressure Ball for Screw Clamps
- System 16 Prism for Screw Clamps
- System 28 Professional Screw Clamp
- Siegmund System 28 welding table clamps
- All Siegmund System 28 clamp replacement parts
- System 28 Pipe Elbow Clamp
Ships across Canada from 5 Industrial Rd, St. Marys, ON N4X 1G2, or pick up from our warehouse. Most orders ship within 48 hours. Email sales@bthsales.ca or call +1-519-461-1381 with questions or for a freight quote.
