60300 H.B. SMITH 4 INCH LOCKNUT WASHER

60300 H.B. Smith 4" Locknut Washer

For 28A and RTS Series Boilers

🔍 Product Overview

The H.B. Smith 60300 Locknut Washer is a durable 4-inch L/N washer designed for use in water and steam return connections on 28A and RTS series boilers.

This washer ensures secure fastening of return components, helping prevent leaks and maintaining proper system pressure. Compatible with Mills 3500A water return components and Mills 6500A steam return components, it is an essential part of boiler maintenance and repair.

🌟 Key Features

✅ Genuine H.B. Smith OEM replacement washer
✅ 4-inch diameter for precise fit
✅ Compatible with 28A and RTS series boilers
✅ Fits Mills 3500A water return and Mills 6500A steam return components
✅ Provides secure, leak-resistant connections
✅ Easy to install for routine maintenance or repairs

⚙️ Technical Specifications

⚠️ Common Symptoms of a Worn or Missing Washer

• Loose return connections

• Water or steam leaks at joints

• Reduced system pressure or efficiency

• Noise from vibrating components

• Visible wear or deformation on the washer

❓ Frequently Asked Questions (FAQ)

Q1: What boilers is this locknut washer compatible with?
➡️ Fits H.B. Smith 28A and RTS series boilers.

Q2: Can this washer be used for both water and steam returns?
➡️ Yes — compatible with Mills 3500A water return and Mills 6500A steam return components.

Q3: What is the diameter of this washer?
➡️ 4 inches.

Q4: When should I replace this washer?
➡️ Inspect during routine boiler maintenance. Replace if it shows wear, corrosion, or if leaks develop.

🛒 Shopping Tips

✅ Confirm your boiler series (28A or RTS) before purchasing.
✅ Use genuine H.B. Smith OEM washers to ensure proper sealing.
✅ Inspect mating surfaces for debris or corrosion before installation.
✅ Replace washers along with seals for leak-free performance.