Siegmund System 28 Bolts
Siegmund System 28 bolts clamp, connect and position components in the Ø 28 mm bores of a 28 mm welding table: fast clamping bolts for quick setups, connecting bolts for fixed joints between tables and U-squares, universal bolts for mixed material thicknesses, and flush mount, magnetic and positioning bolts for special jobs. This collection also holds genuine Siegmund bolt spare parts. BTH Sales is the exclusive Canadian importer of Siegmund; orders ship from St. Marys, Ontario.
Compare System 28 bolts
| Product | Item numbers | Clamping / tool | Key difference (per Siegmund) | Restrictions |
|---|---|---|---|---|
| Fast Clamping Bolt without Slot | 280511, 280513, 280515 | Fast clamping (twistlock, screw top), hex 6 | Smooth body; Siegmund's recommendation for aluminum profiles; spacer ring 800653.1.N for 15 mm Premium Light | Not for tables / U-squares |
| Fast Clamping Bolt Flat without Slot | 280524, 280525 | Fast clamping, flat head, hex 6 | Mainly for elongated holes; reduces protrusion; cordless screwdriver up to 25 Nm | Not for tables / U-squares |
| Fast Clamping Bolt Adjustable without Slot | 280571, 280573 | Fast clamping, knurled thimble ring, hex 6 | Clamping dimension 25–50 / 50–75 mm, for laser-cut profiles of varying thickness | Not for tables / U-squares |
| Fast Clamping Bolt with Handle | 280516 | Tool-free, handle | Handle position adjustable 33–60 mm | Not for tables / U-squares |
| Magnetic Clamping Bolt | 280740, 280740.1, 280740.2; spacer ring 280741 | Tool-free, magnetic (aluminum) | For thin sheet and closed housings where counter-holding is impossible | n/a |
| Magnetic Spacer Ring, Chromed | 280741.C | Spacer sleeve, 25 mm, chromed | Adds space between two clamping elements; chromed version of 280741 (approx. 10 weeks delivery) | n/a |
| Universal Bolt Comfort | 280532, 280533 | Integrated handwheel or hex 14 | Different material thicknesses; clamps 45–53 / 70–78 mm; O-ring self-centring | Not for tables / U-squares |
| Universal Bolt Basic | 280536, 280537 | Hex 14 | Simple version for different thicknesses; clamps 42–57 / 67–82 mm | Not for tables / U-squares |
| Areal Clamping Bolt | 280590, 280590.3, 280590.4 | Hex 14, 50 Nm steel | Recommended for aluminum profiles; clamps about 47–53 / 72–78 / 97–103 mm | Not for tables / U-squares |
| Areal Clamping Flush Mount Bolt | 280595, 280595.3, 280595.4 | Countersunk, hex 6 | Recommended for aluminum profiles; flush; not for elongated holes | Not for tables / U-squares |
| Flush Mount Bolt | 280528, 280529; Premium Light 800528 | Countersunk, hex 6 | Hidden connection, head flush in the bore; not for elongated holes | Not for tables / U-squares |
| Flush Mount Bolt without Slot | 2-AP280528, 2-AP280529, 2-AP280530 | Countersunk, hex 6 | Aluminum profiles only (adapted collar) | Aluminum profiles only |
| Connecting Bolt | 280560.N, 280561, 280562 | Flush, hex 10 top and bottom | Fixed long-term connection of tables and U-squares | Not for aluminum or elongated holes |
| Connecting Bolt with Collar | 280583, 280584, 280585 | Hex 10 top / 6 bottom | Fixed connection of tables, U-squares and aluminum profiles; works in elongated holes | n/a |
| Connecting Bolt Hexagonal | 280550.1 | External hex, 36 / 24 wrench | Fixed long-term connection of 2 components | Not for aluminum profiles |
| Connecting Bolt Siegmund Light (Premium Light) | 800560, 800562 | Hex 10 | Light-to-Light, or 25 mm table to Premium Light | Not for aluminum profiles |
| Positioning Bolt | 280540 | Locating only (no clamping) | Aligns squares that need only one clamping bolt | Not for tables / U-squares |
| Positioning Bolt, Frame Rail | 280541 | Locating only (no clamping), 90 mm | Fixes a connecting frame on a rail | n/a |
Spare parts
- Bolt Spare Parts (289102 and others): O-rings, balls, handwheels 280510.1 / 280512.1 for fast clamping bolts 280511 / 280513, adjusting ring 280653.N and washer packet 280501.
Frequently Asked Questions
Which bolt should I use to connect two System 28 tables?
Use a connecting bolt. Siegmund designed the Connecting Bolt 280560.N and the Connecting Bolt with Collar 280583 as fixed long-term connections between large components such as tables and U-shaped squares. Siegmund says fast clamping, universal, areal clamping, flush mount and positioning bolts must not be used to connect tables or U-shaped squares.
Which bolts are suitable for aluminum profiles?
Siegmund recommends the Fast Clamping Bolt without Slot 280511 and the Areal Clamping Bolts 280590 and 280595 for aluminum profiles, and the Connecting Bolt with Collar 280583 is especially suitable for aluminum. The Flush Mount Bolt without Slot 2-AP280528 (AP280528) is only for aluminum profiles. Siegmund says aluminum parts must only be tightened hand-tight. The Connecting Bolt 280560.N and the hexagonal 280550.1 are not suitable for aluminum profiles.
Which bolt joins parts of different material thickness?
The Universal Bolts. Siegmund gives a clamping range of 42–57 mm for the Universal Bolt Basic 280536 and 45–53 mm (double) or 70–78 mm (triple) for the Universal Bolt Comfort 280532, which has an integrated handwheel. The Adjustable Fast Clamping Bolt 280571 sets its clamping dimension (25–50 or 50–75 mm) with a knurled thimble ring.
Which bolts can be used in elongated holes?
Siegmund says the Fast Clamping Bolt Flat without Slot 280524 is mainly used for clamping elongated holes, and the Connecting Bolt with Collar 280583 also works in elongated holes. The Flush Mount Bolt 280528, the Areal Clamping Flush Mount Bolt 280595 and the Connecting Bolt 280560.N are not suitable for elongated holes.
Which bolts clamp without tools?
The Fast Clamping Bolt with Handle 280516, whose handle adjusts between 33 and 60 mm, and the Magnetic Clamping Bolt 280740, which Siegmund says clamps without bolting or tools and suits thin sheet metal and housings closed all around.
