3315-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 3315-A model number is decoded

3315 A is SKF's 75 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, 75×160×68.3 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 75×160×68.3 mm (2.953×6.299×2.689 in), 42.5 mm radial section height, C 176 kN, C0 140 kN, Pu 5.5 kN.reference speed 4,500 r/min (thermal) and limiting speed 4,000 r/min (mechanical), catalogue mass 5550 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 4,000 r/min while thermal balance under catalogue load sets the 4,500 r/min reference; at dm ≈ 117.5 mm the corresponding dn is approximately 470k mm·r/min. Envelope economics: the 68.3 mm width over a 42.5 mm section yields 1.61 mm of ring width per section millimetre, and the bearing weighs 5550 g for 176 kN of dynamic capacity — about 32 g per rated kN. Speed-ratio note for this exact unit: the reference speed is 4,500 r/min against a 4,000 r/min limiting speed, i.e. a reference-to-limit ratio of 1.13.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• A capped 3315-2Z/-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 75 mm bore); the wide 68.3 mm ring is sensitive to tilted seats, so check squareness before clamping.
• A capped 3315-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.
• Compared with a single-row pair of the same bore, the double-row 3315 occupies less axial space but offers less freedom to adjust preload — do not substitute without re-checking the arrangement.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 3315 A as the double a steel execution; the other order numbers of the 3315 size are different products and may carry different ratings — always quote the full designation when purchasing.