Worcester Bosch Screw KB35 x 22/10 8716117246

The Worcester Bosch KB35 x 22/10 screw is a fixing fastener used in the build of Worcester Bosch gas boilers. It is supplied under part number 8716117246 and carries the GC number J21-396. The screw is used across the Greenstar ErP Compact range, where it holds mating components together so that panels, brackets and assemblies stay correctly aligned and torqued in service.

• Corrosion or surface rust on the head or thread, common where the fastener sits in a damp or condensing area of the appliance.
• A rounded or chewed head that will not take the correct driver, usually found when the screw has been removed and refitted several times.
• Damaged or cross-threaded threads that will not pull down cleanly, leaving the joint loose.
• A missing fastener noticed during a service or after a component has been swapped out.
• Movement or weeping at the joint the screw secures, indicating the fixing is no longer holding the assembly at the correct tension.

• Check the GC number and the appliance serial plate against the compatibility list to confirm the screw is correct for your model.
• Compare the alternative number 1030831 with the marking on the old fastener before ordering.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.