USSEALAC52126211803 AC-52-126-211-803 Mechanical Seal 2 in

Product Description

The USSEALAC52126211803 AC-52-126-211-803 is a replacement mechanical seal designed for centrifugal pump applications. It carries a seal material code of QCFKF, indicating a silicon carbide face, carbon secondary seal, fluoroelastomer elastomers, and a stainless steel metal hardware configuration — a durable combination suited for demanding fluid-handling environments. The head style is C with a seat type 3 configuration, and it fits a 2-inch shaft. This seal is installed by pump service technicians and millwrights working on industrial or commercial centrifugal pump systems.

This mechanical seal is a direct replacement for A-C Pump part number 52-126-211-803. It is suited for use in centrifugal pump assemblies where the original A-C Pump seal requires replacement due to wear, leakage, or scheduled maintenance. The seat bore of 3.00 inches and head outer diameter of 2.88 inches are critical fit dimensions that should be verified against the pump housing before installation. Typical applications include HVAC circulation pumps, industrial process pumps, and water supply systems.

Key Features

• Seal material code QCFKF for chemical and thermal resistance in pump service
• Fits 2-inch shaft diameter with a head outer diameter of 2.88 inches
• Head installed length of 1.50 inches for accurate dimensional replacement
• Seat bore of 3.00 inches and seat thickness of 0.50 inches
• Head style C, seat type 3 configuration for direct OEM-style fitment
• Direct replacement for A-C Pump part number 52-126-211-803

Compatibility

Direct replacement for A-C Pump mechanical seal part number 52-126-211-803. Verify shaft diameter, seat bore, head outer diameter, and installed head length against the pump assembly before installation.

Installation Notes

Mechanical seal replacement should be performed by a qualified pump technician or millwright. Isolate and de-energize the pump, close all isolation valves, and relieve system pressure before disassembly. Handle seal faces carefully to avoid nicks or contamination — do not touch lapped sealing faces with bare hands. Follow the pump manufacturer's service manual for proper installation sequence and spring compression guidelines.

Technical Specifications

• Seal Material Code: QCFKF
• Head Style: C
• Seat Type: 3
• Shaft Size: 2 inches
• Head Outer Diameter: 2.88 inches
• Head Length Installed: 1.50 inches
• Seat Bore: 3.00 inches
• Seat Thickness: 0.50 inches
• Shipping Weight: 1.50 pounds
• Shipping Dimensions: 6.00 x 6.00 x 6.00 inches
• Customs Code: Schedule B 8484200000

Standard Information

• Brand: USSEALAC52126211803
• Manufacturer Part Number: AC-52-126-211-803