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SEALMASTER

SEALMASTER is a brand of mounted ball bearings and bearing accessories originally developed by the Stephens-Adamson Manufacturing Company and now produced by Regal Rexnord. The line is known for its cast iron and stamped steel housings, set screw and eccentric locking collar shaft attachment methods, and standardized boundary dimensions that allow direct interchange with common mounted bearing designs. SEALMASTER products are used in material handling, food processing, packaging, agriculture, and general industrial machinery where radial loads and moderate misalignment must be accommodated.

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About SEALMASTER

SEALMASTER is a brand of mounted ball bearings and bearing accessories originally developed by the Stephens-Adamson Manufacturing Company and now produced by Regal Rexnord. The line is known for its cast iron and stamped steel housings, set screw and eccentric locking collar shaft attachment methods, and standardized boundary dimensions that allow direct interchange with common mounted bearing designs. SEALMASTER products are used in material handling, food processing, packaging, agriculture, and general industrial machinery where radial loads and moderate misalignment must be accommodated.

The product families most commonly specified include flange-mount ball bearings in 2-bolt and 4-bolt configurations, pillow block bearings, take-up units, and cartridge bearings. Housing materials include cast iron for heavier duty applications and stamped steel for lighter duty or space-constrained installations. Bore sizes range from 1/2 in to 2 1/4 in and larger in the cast iron series, with metric sizes available in some families. Shaft locking is typically achieved with set screws or eccentric locking collars. Most units are pre-lubricated with NLGI #2 equivalent grease and feature contact seals or felt seals to retain lubricant and exclude contaminants. Stamped steel flange bearings such as the SRF series use a rhombus or round flange with 7/16 in mounting bolts, while cast iron 4-bolt flange bearings like the MSF series use larger bolt patterns and thicker housings for higher load capacity.

3G Electric supplies SEALMASTER bearings as part of its industrial equipment catalog, with 345 SKUs listed across flange-mount, pillow block, and related configurations. Each listing includes bore size, housing material, mounting bolt size, lubrication type, and overall dimensions to support specification and cross-referencing. The catalog covers stamped steel flange bearings in bore sizes from 1/2 in to 1 1/4 in, cast iron flange bearings up to 2 1/4 in bore, and other mounted bearing types. Technical documentation such as datasheets and CAD models is available for many SKUs. 3G Electric ships globally and supports procurement and maintenance teams with order fulfillment, logistics coordination, and access to replacement bearings for installed equipment.

Common Applications

  • Conveyor systems — SEALMASTER SRF series stamped steel flange bearings support rotating shafts in light to moderate load sections.
  • Material handling equipment — SEALMASTER MSF series cast iron 4-bolt flange bearings handle radial loads on bulk handling conveyors and feeders.
  • Packaging machinery — SEALMASTER 2-bolt flange bearings with set screw locking mount on shafts in cartoners and case packers.
  • Food and beverage processing — SEALMASTER cast iron flange bearings with NLGI #2 grease are used in washdown-adjacent zones where sealed units are required.
  • Agricultural equipment — SEALMASTER stamped steel flange bearings support shafts in grain augers and harvesters where space is limited.
  • Fans and blowers — SEALMASTER flange-mount ball bearings with 1 in to 2 1/4 in bores support fan shafts in industrial ventilation systems.

Frequently asked questions

Common questions about SEALMASTER from 3G Electric.

What is the difference between SEALMASTER SRF and MSF series flange bearings?

The SRF series uses a stamped steel housing with a rhombus or round flange and is intended for lighter radial loads in space-constrained installations. The MSF series uses a cast iron housing with a 4-bolt flange, providing greater rigidity and load capacity. Both use set screws for shaft locking and NLGI #2 equivalent grease. SRF bore sizes in the 3G Electric catalog range from 1/2 in to 1 1/4 in, while MSF cast iron units extend to 2 1/4 in and above.

What shaft locking methods are available on SEALMASTER mounted ball bearings?

SEALMASTER mounted ball bearings commonly use set screws or eccentric locking collars. Set screw locking is standard on the SRF and MSF flange series listed by 3G Electric, where two set screws secure the inner ring to the shaft. Eccentric locking collars are available on select pillow block and flange units. The choice depends on shaft rotation direction, load, and whether frequent removal is required. Set screws are simpler but can mar the shaft; eccentric collars distribute holding force differently and are often used in unidirectional applications.

What lubrication do SEALMASTER flange bearings use, and can they be relubricated?

Most SEALMASTER mounted ball bearings are pre-lubricated at the factory with NLGI #2 equivalent grease. Many cast iron housings include a grease fitting for relubrication, allowing maintenance teams to extend service life in contaminated or high-temperature environments. Stamped steel housings may be sealed for life and not relubricable. Always verify the specific SKU datasheet for lubrication type and relubrication provisions before specifying.

What bore sizes and mounting configurations does 3G Electric stock for SEALMASTER?

3G Electric lists 345 SEALMASTER SKUs covering stamped steel flange bearings with bores from 1/2 in to 1 1/4 in, cast iron 4-bolt flange bearings up to 2 1/4 in bore, and other mounted configurations. Mounting bolt sizes include 7/16 in for the SRF series and larger patterns for cast iron units. Both 2-bolt and 4-bolt flange styles are represented. Availability varies by SKU; contact 3G Electric for current stock and lead times.

How do I select a SEALMASTER flange bearing for a conveyor application?

For conveyor applications, first determine the shaft diameter and required radial load. Stamped steel SRF series bearings are suitable for light to moderate loads where space is limited. Cast iron MSF series bearings handle higher loads and provide better resistance to shock. Consider environmental factors: washdown areas may require sealed or stainless options, while high-temperature zones need appropriate grease. Verify the housing material, bolt pattern, and locking method against the conveyor frame design. 3G Electric provides datasheets with dimensions and load ratings for each SKU.

Are SEALMASTER bearings interchangeable with other mounted bearing brands?

SEALMASTER mounted ball bearings generally follow standard boundary dimensions for flange and pillow block housings, allowing interchange with other brands that conform to the same standards. However, bolt hole spacing, housing height, and locking method can vary. Always compare the specific dimensions from the datasheet, including bore, overall length, bolt size, and flange shape, before substituting. 3G Electric can supply dimensional data for SEALMASTER SKUs to assist with cross-referencing.