RHPSF2-3/4Four-Bolt Square Flange Bearing Unit – 2-3/4 in Bore, Cast Iron, Setscrew Locking, Self-Aligning

Product Description

What this part is

RHP SF2-3/4 four-bolt square flange bearing unit, from the RHP Self-Lube range, made in the United Kingdom. Bore / Shaft Size: 2-3/4 in (69.85 mm). Housing Style: Four-bolt square flange. Material: BS1452 cast iron. Rolling Elements: Balls. Number Of Rows: 1. The unit pairs a wide-inner-ring ball insert with a cast iron flange housing. RHP is an NSK brand.

Housing style and bolt pattern

Bolt Center To Center Length: 152.4 mm (6.000 in), on a four-bolt square pattern. Flange Width Across Corners: 196.5 mm (7.736 in). Overall Height: 158.5 mm (6.240 in). The square flange face bolts to a machine wall or bulkhead so the shaft passes through the mounting plane, which is where a flange unit is chosen over a pillow block.

Designation breakdown

Series: SF, the RHP Self-Lube cast iron four-bolt square flange series. Base Number: SF2-3/4. The size token 2-3/4 is the shaft bore in inches. Locking Method: Setscrew, also called a grub screw, seated in the extended inner ring against the shaft.

What these specs mean in practice

Dynamic Load Rating: 66.0 kN (14,840 lbf). Static Load Rating: 49.5 kN (11,130 lbf). Limiting Speed: 2,300 rpm. Internal Clearance: C3, a greater-than-normal radial clearance that gives the insert room to run under an interference fit and at raised temperature. Closure Type: Nitrile seals on both faces. Item Weight: 8.6 kg (19.0 lb).

Alignment and relubrication

The insert outer ring is spherical and seats in a matching spherical bore in the housing, so the bearing swivels to take up shaft-to-housing misalignment at mounting. Relubrication: Grease fitting supplied on the housing. Lubricant: grease. The unit takes fresh grease in service through that fitting.

Quantity and configuration

Unit Quantity: 1 Pc. One complete flange unit, housing and insert assembled, with the setscrews fitted.

Interchange guidance

The designation is also written SF2.3/4, SF 2-3/4 and MSF2-3/4. The unit is used on conveyors, fans, agricultural drives and general power transmission. The RHP range repeats a bolt pattern across more than one bore, so the 2-3/4 in bore and the 152.4 mm bolt centres identify the unit together.