3320-A bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the 3320-A model number is decoded

3320 A is SKF's 100 mm-bore double-row angular-contact ball bearing of the 3300 series — two ball rows back-to-back for two-direction axial location in one unit, 100×215×82.6 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 100×215×82.6 mm (3.937×8.465×3.252 in), 57.5 mm radial section height, C 255 kN, C0 255 kN, Pu 8.65 kN.reference speed 3,400 r/min (thermal) and limiting speed 2,800 r/min (mechanical), catalogue mass 13500 g. At the printed limiting speed of 2,800 r/min the mean pitch diameter dm ≈ 157.5 mm implies a dn value around 441k mm·r/min; the 3,400 r/min reference speed is the thermal-planning figure under catalogue load. Envelope economics: the 82.6 mm width over a 57.5 mm section yields 1.44 mm of ring width per section millimetre, and the bearing weighs 13500 g for 255 kN of dynamic capacity — about 53 g per rated kN. Bore-to-OD planning: OD 215 over bore 100 is a 2.15× step for this size, and the 82.6 mm width gives a bore/width ratio of 1.21; use these ratios when housing space around the 100 mm shaft is the first constraint.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Compared with a single-row pair of the same bore, the double-row 3320 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.
• Compared with a single-row pair of the same bore, the double-row 3320 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.
• A capped 3320-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.
• Interference goes on the rotating ring (about k5 at 100 mm bore); the wide 82.6 mm ring is sensitive to tilted seats, so check squareness before clamping.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 3320 A as the double a steel execution; the other order numbers of the 3320 size are different products and may carry different ratings — always quote the full designation when purchasing.