SEBO Countersunk Screw M10 x 25 (DIN 7991) for DISCO

By vacuum-cleaner standards M10 is serious hardware, and the DISCO is where SEBO uses it. The M10 x 25 to DIN 7991 is a hexagon socket countersunk head cap screw, which means it is driven with a hex key rather than a bit and pulls down into a conical seat so that nothing stands proud of the surface it clamps. Part 1033 replaces it exactly.

Being a machine thread rather than a thread cut into plastic, it can come apart and go back together many times over. It also means a damaged thread cannot be recovered by simply driving harder. If the screw has been forced, or if the hexagon socket in the head has begun to round under a worn key, replace it before it seizes and turns a straightforward service into a drilling job.

• Part number: 1033
• Fits: SEBO DISCO
• Specification: M10 x 25 to DIN 7991
• Head and drive: countersunk head with a hexagon socket, taken with a hex key
• Thread: M10 machine thread, 25 mm long
• Sold: each

Clean the countersink out before fitting so the head can pull down fully flush. Grit trapped in a conical seat holds the head high, and a countersunk screw that is not seated carries its load on one edge instead of all the way round. Start it by hand to be sure the thread has taken squarely, then bring it up to a firm, even tightness.

A floor polisher puts loads through its fixings that a vacuum never sees, which is why the fastener here is M10 rather than one of the small tapping screws used across the rest of the SEBO parts book. The countersunk head is part of the same reasoning: nothing stands above the surface to catch, and the conical seat centres the screw every time it is refitted.

Anyone searching for a SEBO DISCO countersunk bolt, a DIN 7991 M10 x 25 socket screw or a genuine SEBO DISCO fastener is looking for this part. Confirm the length as well as the thread, since a countersunk head hides most of its shank once it is home. Genuine SEBO hardware supplied by an authorized dealer, on its way in 2-5 business days.