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Buderus Nut EN 1661 M5 10 A3K 5834400

Buderus

Buderus Nut EN 1661 M5 10 A3K 5834400

Buderus M5 hexagon flange nut to EN 1661, property class 10, with A3K coating, for GB312 series boilers.

At a glance

  • Also known as 2241342
Manufacturer part no.
5834400
Showing prices

£0.65

£0.54 ex. VAT · VAT at 20%

Available to order · 7 working days
Available to order · 7 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

This is a Buderus M5 nut manufactured to EN 1661, the standard covering hexagon flange nuts, with a property class of 10 and an A3K coating. It is a fixing component used on Buderus GB312 series gas-fired condensing boilers, where it secures flanged joints and assemblies during servicing and repair work.

Signs this part needs replacing

  • Visible corrosion or coating breakdown on the nut body or flange face
  • Rounded or chewed corners from previous removal with an ill-fitting spanner
  • Damaged or crossed threads that will not run freely onto the stud or bolt
  • The nut has been lost or dropped during strip-down and cannot be recovered
  • The nut will not hold torque and loosens after tightening

Before you order

  • Confirm the thread size required is M5 before ordering
  • Check the property class and coating designation against the existing fixing
  • Confirm how many nuts are needed for the joint or assembly being worked on
  • Check the appliance model against the fit list above to confirm compatibility

Not sure which part?

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