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Navien Screw Bind Head (+) M4 X 12 S1021B

Navien

Navien Screw Bind Head (+) M4 X 12 S1021B

Navien bind head cross recess screw, M4 x 12, S1021B, for NCB-CE ERP system and combination boilers.

At a glance

  • Part type: screw
Manufacturer part no.
20025893A
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

A bind head screw with a cross recess (+) drive, sized M4 x 12 and referenced S1021B. It is supplied by Navien for use on the NCB-CE ERP boiler range. It serves as a general fixing fastener within the appliance.

Signs this part needs replacing

  • The screw is missing after a service or component removal
  • The head is corroded, seized or rounded off so it cannot be driven
  • The thread is stripped or damaged and the screw will not tighten
  • The component it secures is loose, rattling or not held firmly in place

Before you order

  • Confirm your boiler model against the fit list above
  • Check the serial number of your appliance matches the relevant model entry
  • Verify the thread size, length and head type of the screw being replaced
  • Check how many screws are required for the job

Not sure which part?

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