SKF3312-2ZDouble Row Angular Contact Ball Bearing – 60 mm Bore, 130 mm OD, 54 mm Width, 30° Contact Angle, Shields Both Sides

Product Description

What this part is

SKF 3312-2Z is a double-row angular contact ball bearing with shields on both sides. Bore Diameter: 60 mm. Outside Diameter: 130 mm. Overall Width: 54 mm. Contact Angle: 30°. Number Of Rows: 2. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Shields both sides. Cage Material: Pressed steel. Bearing Material: Chrome steel. Lubricant: Grease or oil. Series: 33. Base Number: 3312. Unit Quantity: 1 Pc.

Decoding the designation

33 — the heavy section of the double-row angular contact ball bearing range, two rows of balls in a one-piece inner ring and a one-piece outer ring.

12 — bore code 12, giving 60 mm.

2Z — pressed steel shields on both sides, non-contact.

What these specs mean in practice

Dynamic Load Rating: 127,000 N. Static Load Rating: 95,000 N. Limiting Speed: 5,000 rpm. Two rows of balls set at 30° in opposition means the bearing takes radial load and axial load in both directions in a single position, which is what a matched pair of single-row angular contacts is normally needed for. The 54 mm width on a 60 mm bore is what buys the moment stiffness: the two ball paths are widely spaced, so the bearing resists tilting as well as it resists thrust. Non-contact shields keep the grease charge in without adding the rubbing drag of a lip seal, which is why the speed ceiling stays at 5,000 rpm on a 130 mm outside diameter.

Mounting data

Bore Diameter: 60 mm. Outside Diameter: 130 mm. Overall Width: 54 mm. The shields sit within the ring width, so a plain 54 mm housing counterbore takes the bearing with no extra axial allowance.

Quantity and configuration

Unit Quantity: 1 Pc. One complete double-row bearing.

Interchange guidance

The same bearing is written 3312-2Z, 3312 A-2Z, 4C3312, 5312ZZ and 5312 ZZ.

Cross-Reference 1: SKF 3312 A-2Z. Cross-Reference 2: FAG 3312-BD-2Z-TVH. Cross-Reference 3: NSK 5312ZZ. Cross-Reference 4: NTN 5312ZZ. Cross-Reference 5: Koyo 5312ZZ. Cross-Reference 6: Nachi 5312ZZ. Cross-Reference 7: NTN-SNR 3312-2Z. Cross-Reference 8: 5312ZZ, the older US designation for the same 60 x 130 x 54 mm double-row bearing. Cross-Reference 9: 4C3312, the carton designation carried on this part.

Every number above shares the 60 x 130 x 54 mm envelope, two rows of balls at 30° and shields on both faces. The open form of the same size is written 3312 A and the sealed form 3312 A-2RS1; both fit the same shaft and housing and change the closure, so they are related sizes.