NTN news

NTN’s SPAW heavy-duty mounted bearing units can withstand the severely contaminated environments of waste water treatment plants


4 November 2020 - Toronto - SPAW - Products

SPAW bearing graphic with a "Did you know?" heading

Municipalities around the country rely on waste water treatment facilities to treat sewage and provide reclaimed water. Bearings used in the aeration ponds at these facilities are constantly exposed to water and contamination and must be able to withstand these harsh conditions. Downtime on these ponds can be very costly and create hazards to both the environment and local constituents.

NTN’s SPAW heavy-duty mounted bearing units offer a superior one-piece solid ductile housing design and robust seals which allow them to withstand the severely contaminated and corrosive environments of waste water treatment plants better than the often-used SAF style bearing units.

Our products can handle your most extreme.

NTN precision-engineered bearings are proven to be durable and dependable. Plus they’re readily available in a wide variety of fittings and come with hands-on support from experienced field engineers, all working to help you boost production like never before.



  • Heavy-duty, one-piece, sturdy ductile iron housing to withstand shocks & impacts from falling debris and cold operating conditions
  • Superior sealing protection from water and contaminants with spring-loaded, single-lip contact bearing seal
  • Extra bearing protection with optional end covers for severe debris & contamination services (2 open covers, or 1 open & 1 closed cover)
  • Phosphate-coated bearing insert, locknut & adapter sleeve for corrosion protection
  • Prelubricated & factory sealed for quick, trouble-free start ups
  • Versatile with repositionable snap ring for fixed or floating operation
  • Drop-in replacement for split housing bearings permitting faster, easier installations than SAF/SN units, having the same base-to-shaft center height and bolt position
man in hard hat inspecting pipe fitting

Not only do our SPAW units offer superior performance, but they are so easy to install that they deliver a 60% faster installation time and are a direct interchange to SAF style units. Additionally, the phosphate coated unitized bearing inserts and adapter assembly offer excellent corrosion resistance.

Contact your local NTN representative to learn more about our SPAW/SPW Mounted Roller Bearing Units. You can also access additional information at

Download Waste Water Treatment Application Sheet



About NTN

Founded in 1918, NTN is one of the world's largest producers of premium quality ball and roller bearings, long recognized for the most stringent quality standards in the industry. With plants around the globe and a strong domestic manufacturing network, over 80% of the products sold by NTN in North America are made by one of the ten plants the company operates in Canada and the USA. NTN is also a leading provider of bearing services which include technical support, maintenance and reliability services, engineering consulting and training. NTN's company vision is "to transform into Canada’s leader of the Ultimate Bearing Experience."

NTN Contact

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