301 Series Mechanical Shaft Seal for Water & Circulation Pumps

301 Series Single Coil Spring Mechanical Shaft Seal

Keep your water pump running leak-free with this precision-engineered 301 Series Mechanical Shaft Seal. Designed for clean water pumps and circulation pumps, this single coil spring seal features a durable multi-material construction that ensures a reliable, long-lasting seal across a wide range of operating conditions. Available in shaft sizes 26, 28, 30, 36, 42, 45, and 50mm to fit a variety of pump configurations.

Made in Mainland China.

Key Specifications

• Series: 301
• Stationary Ring: Ceramic
• Rotary Ring: Carbon
• Secondary Seal: Nitrile Rubber (NBR)
• Spring: Stainless Steel (single coil)
• Compatible Shaft Diameters: 26 / 28 / 30 / 36 / 42 / 45 / 50mm
• Operating Temperature: -20°C to +100°C
• Operating Pressure: ≤ 0.5 MPa
• Max Speed: ≤ 10 m/s
• Application: Clean water pumps, circulation pumps
• Material: Silicon / Ceramic / Carbon / NBR / Stainless Steel

Why Choose This Shaft Seal?

• Multi-Material Build: Ceramic stationary ring and carbon rotary ring provide excellent wear resistance and extended service life.
• NBR Secondary Seal: Nitrile rubber offers strong resistance to water and common pump media, minimizing leakage risk.
• Stainless Steel Spring: Corrosion-resistant coil spring maintains consistent face pressure for a dependable seal.
• Wide Size Range: Seven shaft diameter options (26–50mm) make this seal suitable for a broad range of residential and industrial circulation pumps.
• Broad Temperature Range: Performs reliably from -20°C to +100°C, handling both cold-water and hot-water circulation systems.

What's in the Box?

• 1 × Mechanical Shaft Seal (301 Series)

Important Notes

• Photos are for reference only and may not reflect the actual size — please refer to the shaft diameter specifications listed above before purchasing.
• Minor dimensional differences due to manual measurement are possible; please allow a small tolerance.
• Screen color settings may cause slight variations between displayed and actual product color.

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Frequently Asked Questions

Q: What shaft sizes does the 301 Series mechanical shaft seal fit?

A: This mechanical shaft seal is available in seven shaft diameter options: 26mm, 28mm, 30mm, 36mm, 42mm, 45mm, and 50mm. Please measure your pump's shaft diameter carefully before ordering to ensure the correct fit.

Q: What types of pumps is this shaft seal compatible with?

A: The 301 Series shaft seal is designed for use with clean water pumps and circulation pumps. It is not recommended for use with abrasive or highly corrosive fluids beyond its rated media compatibility.

Q: What is the maximum operating temperature and pressure for this seal?

A: This seal is rated for operating temperatures from -20°C to +100°C and pressures up to 0.5 MPa, making it suitable for both cold and hot water circulation systems in residential and light industrial applications.

Q: What materials are used in this mechanical shaft seal?

A: The stationary ring is ceramic, the rotary ring is carbon, the secondary seal is made of Nitrile Rubber (NBR), and the spring is stainless steel — all materials selected for durability, corrosion resistance, and long service life.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.