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Navien Screw Hex Socket Head M5 x 10 S15C 20009865A

Navien

Navien Screw Hex Socket Head M5 x 10 S15C 20009865A

Navien hex socket head screw, M5 x 10, in S15C steel, for NCB combi boiler assemblies.

At a glance

  • Appliance family: NCB combi
Manufacturer part no.
20009865A
Showing prices

£3.91

£3.26 ex. VAT · VAT at 20%

Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question

Same-day dispatch

Ordered by 4pm Mon–Fri, 10:30am Sat.

30-day returns

Unused, in original packaging.

What it is

The Navien hex socket head screw, M5 x 10 S15C, is a machine screw used in Navien NCB combi boiler assemblies. It has an M5 thread, a 10 mm length and a recessed hex socket drive, and is manufactured in S15C carbon steel. It is used to secure internal components within the appliance.

Signs this part needs replacing

  • The screw turns without tightening, indicating stripped threads
  • The hex socket is rounded and the key slips under load
  • Visible corrosion or rust on the screw head or thread
  • The screw is missing following service or repair work
  • The component it secures is loose, rattling or vibrating

Before you order

  • Confirm the thread size and length match the fastener being replaced
  • Check the drive type matches the tooling you have available
  • Verify your boiler model against the fit list above
  • Check how many screws the assembly requires before ordering

Not sure which part?

Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.