RHPMSF2-3/16Self-Lube Four-Bolt Square Flange Bearing Unit, Cast Iron – 2-3/16 in Bore, 143 mm Bolt Centres, C3 Clearance

Product Description

What this part is

RHP MSF2-3/16 Self-Lube four-bolt square flange bearing unit. Manufacturer: RHP, now part of NSK. Part Number: MSF2-3/16. Series: MSF, RHP Self-Lube four-bolt square flange. Bore / Shaft Size: 2-3/16 in (55.56 mm). Housing Style: four-bolt square flange, cast iron. Bolt Count: 4. Bolt Hole Centres: 143 mm (5.63 in). Housing Material: cast iron to BS1452. Insert: spherical outer surface, self-aligning. Locking Method: setscrew (grub screw). Seal Type: nitrile / fabric. Internal Clearance: C3. Number Of Rows: 1. Rolling Elements: steel balls. Design Units: Inch. Country of Origin: United Kingdom.

Decoding the designation

MSF is RHP’s Self-Lube four-bolt square flange cast iron unit. The 2-3/16 is the bore in inches. Bore / Shaft Size: 2-3/16 in (55.56 mm). Design Units: Inch.

Housing style and bolt pattern

Housing Style: four-bolt square flange. Bolt Count: 4. Bolt Hole Centres: 143 mm (5.63 in). The four holes sit at the corners of a square with 143 mm between centres on each side, so the unit bolts to a face perpendicular to the shaft with the shaft passing through the flange, and the square pattern resists moment load in every direction. Housing Material: cast iron to BS1452, the British Standard for grey iron castings, which is the specification a structural calculation on the housing runs against.

What these specs mean in practice

Insert: the bearing’s outer surface is spherical and seats in a matching spherical bore in the housing, so the insert swivels to take up initial misalignment between the shaft and the mounting face as the unit is bolted down. That is what allows a Self-Lube unit to go onto fabricated steelwork rather than a machined boss. Locking Method: setscrew — two grub screws in the extended inner ring clamp the insert to a plain shaft, so no keyway, step or shoulder is needed. Internal Clearance: C3, a clearance one step above normal, which suits the temperature rise of a housed unit under continuous duty and the interference the grub screws put into the inner ring. Seal Type: nitrile / fabric seals at both faces, excluding dust and water while holding the factory grease charge. The unit is a complete assembly and can be removed and refitted without breaking the housing.

Quantity and configuration

Unit Quantity: 1 Pc. One complete flange unit: cast iron housing, insert bearing, seals and grub screws.

Interchange guidance

A flange unit interchanges when the bore and the bolt hole centres both match, because the bolt pattern is what the mounting face is drilled to. Bore / Shaft Size: 2-3/16 in. Bolt Hole Centres: 143 mm. Within the RHP Self-Lube range the same insert size appears in other housings: SFT is the two-bolt oval flange, SF is the standard square flange, and the pillow block styles bolt to a base parallel to the shaft. Searchable variants of the number: MSF2-3/16, MSF 2-3/16, MSF 2 3/16, MSF2 3/16, MSF-2-3/16, MSF2.3/16, MSF2 3 16.