SKF6311-2ZDeep Groove Ball Bearing – 55 mm Bore, 120 mm OD, 29 mm Width, Steel Shields Both Sides, Pressed Steel Cage

Product Description

What this part is

SKF 6311-2Z is a single-row deep groove ball bearing with pressed steel shields on both sides. Bore Diameter: 55 mm. Outside Diameter: 120 mm. Overall Width: 29 mm. Closure Type: Shields both sides. Cage Material: Pressed steel. Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Bearing Material: Chrome steel. Lubricant: Grease or oil. Item Weight: 1.39 kg (3.06 lb). Series: 63. Base Number: 6311. Unit Quantity: 1 Pc.

Decoding the designation

63 — ISO 63 dimension series, the heavy section of the deep groove range. At a 55 mm bore that gives a 120 mm outside diameter and a 29 mm width, against 100 x 21 mm for the 62 series at the same bore.

11 — bore code 11, giving 55 mm.

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

What these specs mean in practice

Dynamic Load Rating: 74,100 N. Static Load Rating: 45,000 N. Limiting Speed: 6,300 rpm. Item Weight: 1.39 kg (3.06 lb). The 63 section puts a larger ball complement on a bigger pitch circle than the 62 series at the same bore, which is where the 74,100 N dynamic rating comes from. Non-contact shields retain the grease charge and exclude coarse contamination without the rubbing drag of a lip seal, so the bearing keeps a 6,300 rpm ceiling on a 120 mm outside diameter.

Mounting data

Bore Diameter: 55 mm. Outside Diameter: 120 mm. Overall Width: 29 mm. The shields sit within the ring width, so a plain 29 mm housing counterbore takes the bearing with no extra axial allowance.

Quantity and configuration

Unit Quantity: 1 Pc. One complete shielded bearing.

Interchange guidance

The same bearing is written 6311-2Z, 6311 2Z, 6311ZZ and 311-2Z.

Cross-Reference 1: SKF 6311-2Z. Cross-Reference 2: FAG 6311-2Z. Cross-Reference 3: NSK 6311ZZ. Cross-Reference 4: NTN 6311ZZ. Cross-Reference 5: Koyo 6311ZZ. Cross-Reference 6: Timken 6311-2Z. Cross-Reference 7: INA 6311-2Z. Cross-Reference 8: Nachi 6311ZZ. Cross-Reference 9: NTN-SNR 6311ZZ.

Every number above shares the 55 x 120 x 29 mm envelope and steel shields on both faces. The open form of the same size is written 6311 and the contact-sealed form 6311-2RS1; both fit the same shaft and housing and change the closure, so they are related sizes.