MRCMaximum Capacity Filling Slot Ball Bearing – 60 mm Bore x 130 mm OD x 31 mm Wide, One Shield, Snap Ring

Product Description

What this part is: MRC 312MFG single-row maximum-capacity filling-slot ball bearing, 60 mm bore, 130 mm outside diameter, 31 mm wide, with one metal shield and a snap ring carried in a groove in the outer ring. Bore Diameter: 60 mm. Outside Diameter: 130 mm. Overall Width: 31 mm. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Shield one side. Cage Material: Pressed steel. Cage Type: Pressed, ball-guided. Bearing Material: Chrome steel. Internal Clearance: CN. Precision Class: ABEC 1 / P0. Series: MRC 300-M medium. Decoding the designation: 312 — MRC 300 medium series at bore code 12, giving a 60 mm bore in a 130 mm housing. M — maximum capacity, filling notch. A loading slot cut in the shoulder of each ring lets more balls into the raceway than a Conrad assembly takes, raising both load ratings. F — one metal shield. On MRC, F and FF are shields and Z and ZZ are rubber seals, which is inverted from most makers. G — snap ring groove machined in the outer ring, with the snap ring supplied in it. What these specs mean in practice: Dynamic Load Rating: 91,300 N. Static Load Rating: 78,000 N. Against the Conrad 312S on the identical envelope, the filling notch buys roughly 11 percent more dynamic capacity and 50 percent more static capacity. The extra ball complement is what does it. The filling notch interrupts one shoulder on each ring, so the bearing is at its best under predominantly radial load with light, one-way thrust. Radial capacity is where the M type earns its place. The snap ring locates the outer ring axially against a plain, unshouldered housing bore, so the housing can be a straight-through bore rather than a stepped one. That is the standard fix for a through-bored motor endbell or a fabricated housing. The single shield closes the bearing on one face against swarf and coarse contamination while leaving the other face open for grease feed from the housing cavity. Internal Clearance: CN. Standard radial clearance. Precision Class: ABEC 1 / P0, standard annular tolerance. Mounting data: Outer ring located axially by the snap ring in its outer-ring groove. Bore Type: Straight, 60 mm, for an interference fit on the shaft seat. Overall Width: 31 mm across the rings. Quantity and configuration: Unit Quantity: 1 Pc. One individual bearing, one shield, snap ring fitted. Interchange guidance: Closest first is the NSK BL312 family, also a maximum-capacity filling-slot ball bearing in the 60 x 130 x 31 mm size. The 6312 numbers listed share the size and mounting dimensions but are Conrad deep groove construction with unbroken raceway shoulders, so they are related sizes, not substitutes. MPN variants: 312MFG, 312-M-F-G, 312 M F G.