Navien
Navien Flat Head Screw M4 x 10 SCM435 20038757A
Navien flat head cross recess screw, M4 x 10, in SCM435 steel, used across LCB 700 and NCB series boilers.
£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 flat head cross recess (+) screw, M4 x 10, manufactured in SCM435 steel and supplied by Navien. It is a fastener used in the assembly of Navien LCB 700 and NCB series gas boilers, where it secures components that require a flush-fitting head.
Signs this part needs replacing
- The head is corroded, chewed or rounded, so the driver no longer bites
- The cross recess has stripped out and the screw cannot be turned
- The threads are damaged or the screw will not torque down
- The screw has worked loose and the component it holds is no longer secure
- The screw is missing after a previous service or strip-down
Before you order
- Confirm the thread size and length required are M4 x 10
- Check the head type and drive match the fixing point you are working on
- Check how many fixings are needed for the job, as this is a single screw
- Verify your appliance model against the fitment list above 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) | — | — | — |
Showing 10 of 48 compatible appliances.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
NAVIEN appliance manual — LCB 700 COMBI EXTERNAL 21KW (Serial Number 1705), LCB 700 COMBI EXTERNAL 28KW (Serial Number 1710), LCB 700 COMBI EXTERNAL 36KW (Serial Number 1709), LCB 700 COMBI INTERNAL 21KW (Serial Number 1704), LCB 700 COMBI INTERNAL 28KW (Serial Number 1706), LCB 700 COMBI INTERNAL 36KW (Serial Number 1708), LCB 700 REGULAR EXTERNAL 21KW (Serial Number 1474), LCB 700 REGULAR EXTERNAL 28KW (Serial Number 1478), LCB 700 REGULAR EXTERNAL 36KW (Serial Number 1482), LCB 700 REGULAR INTERNAL 21KW (Serial Number 1472), LCB 700 REGULAR INTERNAL 28KW (Serial Number 1477), LCB 700 REGULAR INTERNAL 36KW (Serial Number 1481), LCB 700 SYSTEM EXTERNAL 21KW (Serial Number 1471), LCB 700 SYSTEM EXTERNAL 28KW (Serial Number 1476), LCB 700 SYSTEM EXTERNAL 36KW (Serial Number 1480), LCB 700 SYSTEM INTERNAL 21KW (Serial Number 1434), LCB 700 SYSTEM INTERNAL 28KW (Serial Number 1475), LCB 700 SYSTEM INTERNAL 36KW (Serial Number 1479)
manualmanualNAVIEN appliance manual — NCB300-28K COMBI - (Serial Number 3710), NCB300-37K COMBI - (Serial Number 3734), NCB300-41K COMBI - (Serial Number 3711)
manualmanualNAVIEN appliance manual — NCB500-1S+/32K COMBI - (Serial Number 3924), NCB500-2S+/41K COMBI - (Serial Number 3712), NCB500-2S/37K COMBI - (Serial Number 3735)
manualNo technical questions yet for this part.
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