Worcester Retaining Nut 87161066830

Worcester Domestic

The Worcester Retaining Nut (Part No. 87161066830) is a genuine OEM (Original Equipment Manufacturer) hardware component used to secure critical hydraulic and gas connections within Worcester Bosch Greenstar boilers. This nut is specifically designed to provide the necessary clamping force to compress gaskets and O-rings, ensuring a permanent, leak-free seal. Due to its role in securing pressurized components, it is manufactured from high-grade, corrosion-resistant brass to withstand the damp and hot environment inside a boiler casing.

Key Features and Specifications
High-Grade Brass Construction: Resistant to "dezincification" and corrosion, ensuring the nut remains easy to remove for future maintenance even after years of service.

Precision Threading: Manufactured to exacting tolerances to prevent cross-threading and to ensure uniform pressure across the sealing face.

Genuine Worcester Bosch Part: Guarantees that the nut has the correct tensile strength and dimensions required for the safety-critical connections it secures.

Durable Design: Built to handle the high torque required to create a gas-tight or watertight seal without stripping or deforming.

Versatile Application: Used across various models to secure the gas valve flanged connections or specific hydraulic pipework to the manifold.

Boiler Compatibility
This retaining nut is a standard hardware item used across the extensive Worcester Greenstar range. Common compatible models include:

Greenstar CDi (Classic & Highflow): 25CDi, 30CDi, 35CDi, 40CDi, 42CDi.

Greenstar i Junior: 24i Junior, 28i Junior.

Greenstar Si: 25Si, 30Si.

Greenstar Ri: 12Ri, 15Ri, 18Ri, 24Ri.

Greenstar FS: Floor-standing models.

Technical Tip: When performing maintenance on a gas valve or heat exchanger, it is common for these nuts to become "seized" due to heat or minor oxidation. If the nut shows signs of rounded edges or thread damage during removal, it should be replaced with a new genuine 87161066830 to ensure the connection can be safely torqued to the manufacturer's specification.

Essential Companion Products
To ensure a professional and safe repair, the following genuine Worcester seals are frequently required alongside this retaining nut:

Gas Sealing: Worcester Gas Valve Gasket - 87161068000

Alternative Gas Seal: Worcester Gas Valve Gasket - 871860034A0

Valve Support: Worcester Bracket Gas Valve - 8716117867

Specialist Support and Local Collection
Are you struggling to remove a seized nut or unsure if this is the correct size for your specific pipework? Our trade counter team can assist you in identifying all the hardware and seals needed for your repair.

Visit our trade counter and Bathroom Showroom at 61 Fullers Road, E18 2QB for expert technical advice and quick access to genuine Worcester Bosch spares.