Baxi Pan Head Screw M4 x 10mm Posi 633942

The Baxi 633942 is a pan head screw with a Posi (cross) drive, sized M4 x 10mm. It is a small fixing used to secure components, brackets and panels within Baxi and Potterton gas appliances, and it appears across a wide spread of the Potterton British Gas F2 range. As a service fixing it is one of the parts most often lost, dropped or damaged during a strip-down, so having the correct thread and length to hand keeps a repair moving.

• The screw is missing after a previous repair, leaving a panel or bracket held by fewer fixings than intended
• The Posi recess is chewed or rounded, so the driver slips instead of turning the screw
• Corrosion or surface rust on the head or thread, common where a fixing sits in a damp or condensate-affected area
• The screw has worked loose through vibration and will not hold torque when tightened
• Thread damage or cross-threading that prevents the fixing seating cleanly

• Check the appliance GC number against the compatibility list to confirm this fixing is the correct one for your model
• Note the alternative and previous part numbers listed below, as older stock and documentation may reference them
• Confirm the size and drive type against the fixing you are replacing, since M4 x 10mm pan head Posi screws are used in several positions on the same appliance