Item 280669.N: Siegmund Prism Collar Screw with countersunk bolt, nitrided, for System 28. Siegmund says the screw collar is used to fasten prisms in the bores, and the countersunk bolt fixes System 28 prisms with screw collar in the bores. BTH Sales is the exclusive Canadian importer of Siegmund.
Specifications
| Siegmund article | 280669.N (siegmund.com) |
|---|---|
| System | Siegmund System 28 (Ø28 mm bores, 100 mm grid) |
| Length | 17 mm (0.67 in) |
| Diameter | 28 mm (1.10 in) |
| Weight | 0.14 kg (0.31 lb) |
| Finish | Nitrided |
| GTIN | 4251805927146 |
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.
- 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
- 1 x Siegmund Prism Collar Screw with countersunk bolt nitrided (280669.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
- Fastening System 28 prisms in the system bores (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
What is the prism collar screw for?
Siegmund says the screw collar is used to fasten prisms in boreholes, and the countersunk bolt fixes System 28 prisms with screw collar in the boreholes.
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 Countersunk Bolt M16 (009410)
- System 28 prism for screw clamps
- Siegmund System 28 bolts
- All Siegmund System 28 prisms and supports
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.