MRC312MMaximum-Capacity Filling-Slot Ball Bearing – 60 mm ID, 130 mm OD, 31 mm Width, Open, Pressed Steel Cage

Product Description

What this part is: MRC 312-M maximum-capacity filling-notch single-row ball bearing. Bearing Type: maximum capacity, filling notch. 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. Cage Type: two-piece ball-riding stayrod cage. Cage Material: pressed steel. Dynamic Load Rating: 91,300 N (20,500 lbf). Static Load Rating: 78,000 N (17,500 lbf). Limiting Speed: 4,300 rpm on grease, 5,300 rpm on oil. Maximum Shaft or Housing Fillet Radius: 2.0 mm (0.08 in). Internal Clearance: ABMA C0. Item weight: 4.0 lb (1.81 kg). Series: MRC 300 Medium. Decoding the designation: 3 — the MRC 300 Medium Series. 12 — bore code, multiplied by five to give Bore: 60 mm. M — maximum capacity, filling notch. What these specs mean in practice: Dynamic Load Rating: 91,300 N. Static Load Rating: 78,000 N. The 300 Medium Series puts a heavier section around the same 60 mm bore than the 200 Light Series does, and the filling notch adds ball complement on top of that. The two together are why this bearing carries 91.3 kN dynamically where the 212-M on the same bore carries 56.1 kN. Bearing Type: maximum capacity, filling notch. The notch interrupts one shoulder of each raceway, so the type carries its load radially and its thrust capacity is small beside its radial capacity. That is the trade the design makes. Limiting Speed: 4,300 rpm on grease, 5,300 rpm on oil, rated for the pressed steel cage at ABEC 1. Internal Clearance: ABMA C0. Maximum Shaft or Housing Fillet Radius: 2.0 mm — the largest corner radius on the shaft shoulder or housing bore that the bearing corner will clear. Quantity and configuration: Unit Quantity: 1 Pc. One open bearing. Interchange guidance: Searchable variants of the number: 312M, 312-M, 312 M, MRC 312M. The filling-slot equivalent on the same 60 x 130 x 31 mm envelope is the NSK BL312 maximum-type series. The Conrad bearing on that envelope is a different design with an uninterrupted raceway and different capacities, so it is a related size rather than a like-for-like substitution. MRC 312-S is the Conrad deep groove bearing in the same series and bore, and 212-M is the light-series maximum-capacity bearing on the same 60 mm bore.