Armstrong 816302-319k Impeller Universal 5 Inch H-51

Product Description

The ARMSTRONG 816302-319k is a universal replacement impeller designed for use in Armstrong hydronic circulator and pump assemblies. The impeller measures 5 inches in diameter and is referenced under the H-51 classification, indicating its fit within a specific Armstrong pump family. This component is responsible for moving fluid through the hydronic loop, converting rotational energy from the pump motor into flow and pressure. Installation is performed by licensed HVAC technicians and plumbers servicing hydronic heating and cooling systems. The universal designation indicates cross-compatibility across multiple Armstrong pump configurations sharing the H-51 dimensional profile.

This impeller is suited for residential and light commercial hydronic systems where Armstrong circulators are installed. Typical applications include hot water heating loops, chilled water systems, and radiant floor systems that rely on Armstrong pump assemblies. The 5-inch diameter and H-51 designation narrow the fitment to specific pump housings within the Armstrong lineup. Technicians replacing worn, cavitated, or damaged impellers will find this part an OEM-style fit for the applicable pump configurations. The 1B and 1.25B references in the part designation may indicate bore sizing relevant to shaft compatibility.

Key Features

• 5-inch impeller diameter matches H-51 Armstrong pump classification
• Universal replacement design compatible across multiple Armstrong pump configurations
• OEM-referenced part for Armstrong hydronic circulator and pump assemblies
• Bore references (1B and 1.25B) address shaft fitment for applicable pump models
• Designed for fluid-moving duty in hydronic heating and cooling loops

Compatibility

Designed as an OEM-style replacement impeller for Armstrong hydronic pump assemblies within the H-51 classification. Refer to the Armstrong parts reference for full model-level compatibility before installation.

Installation Notes

Impeller replacement on hydronic circulators should be performed by a licensed HVAC technician or plumber. Isolate and drain the affected pump section before disassembly, and ensure system pressure is fully relieved prior to opening the pump housing. Verify shaft diameter and bore compatibility against the 1B or 1.25B designation before installation. Follow applicable mechanical codes and the pump manufacturer service documentation throughout the procedure.

Technical Specifications

• Impeller Diameter: 5 inches
• Pump Classification: H-51
• Type: Universal Replacement Impeller

Standard Information

• Brand: ARMSTRONG
• Manufacturer Part Number: 816302-319k