Navien
Navien Screw Hex Socket Head M4 x 6 SCM435 20009864A
Hex socket head screw, M4 x 6, in SCM435 alloy steel, supplied by Navien for the LCB 700 boiler range.
£3.91
£3.26 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
A hex socket head screw measuring M4 x 6 and manufactured in SCM435 chrome-molybdenum alloy steel. It is supplied by Navien for use across the LCB 700 boiler family. The fastener secures internal components and panels where a compact, high-strength socket head fixing is required.
Signs this part needs replacing
- The screw is missing from its fixing point, leaving a component or panel unsecured
- The hex socket has rounded off and the screw can no longer be driven or removed
- Visible corrosion or pitting on the head or thread
- The screw has worked loose through vibration and will not hold torque
- Thread damage preventing the screw from seating correctly
Before you order
- Confirm your boiler model and serial number against the fitment list
- Check the existing fastener is M4 x 6 with a hex socket head
- Establish how many screws are required for the repair before ordering
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| NAVIEN LCB 700 COMBI EXTERNAL 21KW (Serial Number 1705) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 21KW (Serial Number 1705) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 28KW (Serial Number 1710) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 28KW (Serial Number 1710) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 36KW (Serial Number 1709) | — | — | — | |
| NAVIEN LCB 700 COMBI EXTERNAL 36KW (Serial Number 1709) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 21KW (Serial Number 1704) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 21KW (Serial Number 1704) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 28KW (Serial Number 1706) | — | — | — | |
| NAVIEN LCB 700 COMBI INTERNAL 28KW (Serial Number 1706) | — | — | — |
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Documents & drawings
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