QJ-310-PHAS 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 QJ-310-PHAS model number is decoded

QJ 310 PHAS is SKF's 50 mm-bore QJ four-point contact ball bearing of the QJ300 series, 50×110×27 mm, with a two-piece inner ring for bidirectional axial location beside a radial bearing. QJ identifies a four-point contact ball bearing with a two-piece inner ring: the gothic-arch raceways seat each ball at four points, giving axial location in both directions while a paired radial bearing carries the radial load. glass-fibre reinforced PEEK cage, outer-ring-centred with lubrication grooves in the guiding surfaces (suffix PHAS), for very high-speed oil-air or grease lubrication. Envelope 50×110×27 mm (1.969×4.331×1.063 in), 30.0 mm radial section height, C 118 kN, C0 100 kN, Pu 4.25 kN.SKF publishes only the 11,000 r/min limiting speed for this execution, catalogue mass 1350 g. Speed planning distinguishes the two published ceilings mechanically: the cage and balls tolerate 11,000 r/min and no separate thermal reference is published; at dm ≈ 80.0 mm the corresponding dn is approximately 880k mm·r/min. At the printed limiting speed of 11,000 r/min the mean pitch diameter dm ≈ 80.0 mm implies a dn value around 880k mm·r/min; only the limiting speed is published for this execution. Bore-to-OD planning: OD 110 over bore 50 is a 2.20× step for this size, and the 27 mm width gives a bore/width ratio of 1.85; use these ratios when housing space around the 50 mm shaft is the first constraint. Plain outer-ring execution: this order number is delivered without N2 locating slots, so anti-rotation is solved in the housing instead — a shoulder dog, a spring-loaded key, a cover feature or an interference-free circlip arrangement. Because the outer ring deliberately runs with radial clearance and a small axial float gap, omitting positive anti-rotation invites seat fretting; the slotted N2 order number is the alternative when the housing can provide engagement pins.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The PHAS PEEK outer-ring-centred cage with lubrication grooves suits the highest speeds with oil-air lubrication
• The inner ring is two-piece: handle both halves together, mount square, and do not separate the split ring unless the fitting procedure requires it.
• Run the QJ as a thrust bearing with radial clearance in the housing, paired with a separate radial bearing; the QJ outer ring must not be radially clamped.
• Anti-rotation is NOT built into QJ-310-PHAS: without N2 slots the housing must provide a dog, keyed cover or other positive stop, since the outer ring runs radially loose by design.
• The PHAS PEEK cage of QJ-310-PHAS is outer-ring-centred with lubrication grooves: feed clean oil-air or appropriate grease to the guide land and inspect groove filling at overhaul.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for QJ 310 PHAS as the qj plain execution; the other order numbers of the QJ 310 size are different products and may carry different ratings — always quote the full designation when purchasing.