MRC312SDeep Groove Ball Bearing – 60 mm ID, 130 mm OD, 31 mm Width, Open, C3 Clearance, Pressed Steel Cage

Product Description

What this part is: MRC 312-S Conrad deep groove ball bearing. Bearing Type: Conrad single-row deep groove. Bore: 60 mm (2.3622 in). Outside Diameter: 130 mm (5.1181 in). Overall Width: 31 mm (1.2205 in). Closure Type: open, both faces. Number Of Rows: 1. Rolling Elements: ball. Contact Angle: 0°. Cage Material: pressed steel. Internal Clearance: ABMA C3, MRC LO fit. Dynamic Load Rating: 81,900 N (18,400 lbf). Static Load Rating: 52,000 N (11,700 lbf). Limiting Speed: 5,000 rpm on grease, 6,000 rpm on oil. Maximum Shaft or Housing Fillet Radius: 2.0 mm (0.08 in). Item weight: 4.0 lb (1.81 kg). Series: MRC 300-S Medium. Decoding the designation: 3 — the MRC 300-S Medium Series. 12 — bore code, multiplied by five to give Bore: 60 mm. S — Conrad deep groove, no filling notch. LO — MRC’s own name for ABMA C3 radial clearance. What these specs mean in practice: Bearing Type: Conrad deep groove with full shoulders on both rings and uninterrupted raceway grooves. That geometry gives equal load capacity in either direction and lets the bearing take substantial thrust in both directions alongside its radial load. Internal Clearance: ABMA C3, wider than standard. The extra radial clearance survives the loss that a tight shaft fit and a hot inner ring both take out of it, which is why C3 is the usual specification for electric motors, fan shafts and anything running with a significant temperature difference between the rings. Series: 300-S Medium. The heavier section around a 60 mm bore carries 81.9 kN dynamically, for heavy radial load with two-directional thrust. Maximum Shaft or Housing Fillet Radius: 2.0 mm — the largest corner radius on the shaft shoulder or in the housing bore that the bearing corner will clear. Quantity and configuration: Unit Quantity: 1 Pc. One bearing, open on both faces. Interchange guidance: Searchable variants of the number: 312S, 312-S, 312 S, 312-S-LO, MRC 312S. The 60 x 130 x 31 mm open deep groove envelope at C3 clearance is the ISO 6312 C3. MRC 312-SF carries one shield, 312-SFF two shields and 312-SZZ two synthetic rubber seals on the same envelope.