QJ-316-N2PHAS 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-316-N2PHAS model number is decoded

QJ 316 N2PHAS is SKF's 80 mm-bore QJ four-point contact ball bearing of the QJ300 series, 80×170×39 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. N2 marks two locating slots, 180° apart, in one outer-ring side face: pins or dogs engage the slots to stop the outer ring turning in its radially-clear housing bore. 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 80×170×39 mm (3.15×6.693×1.535 in), 45.0 mm radial section height, C 232 kN, C0 228 kN, Pu 8.65 kN.SKF publishes only the 7,000 r/min limiting speed for this execution, catalogue mass 4600 g. The 8.65 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 232/228 kN ratings and 4600 g mass this execution carries about 2.90 kN of C per millimetre of bore. Sizing arithmetic on the 80 mm bore: 232 kN C divided by the 45.0 mm radial section height gives 5.2 kN per section millimetre; the 4600 g mass and 4 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 170 over bore 80 is a 2.13× step for this size, and the 39 mm width gives a bore/width ratio of 2.05; use these ratios when housing space around the 80 mm shaft is the first constraint. Locating-slot execution: the two N2 notches are milled into one outer-ring side face exactly 180 degrees apart and engaged by housing dogs or headed pins during assembly; verify dog engagement by hand before the cover goes on, deburr the slot edges after any housing rework, and re-inspect the slot roots for fretting marks at each overhaul because a dog that rides only one slot lets the outer ring walk. The slots identify this order number unmistakably: the plain MA/PHAS execution of the same bore has no notches and must be secured differently.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Apply the Fa/Fr ≥ 1,27 condition: at lower ratios the balls contact both sides of a raceway, increasing friction and shortening life — the paired radial bearing should carry the radial share.
• The PHAS PEEK outer-ring-centred cage with lubrication grooves suits the highest speeds with oil-air lubrication
• Provide a minimum axial load (spring preload is common) so the balls stay correctly seated at speed and light-load conditions; otherwise they skid.
• Anti-rotation is built into QJ-316-N2PHAS: check the two N2 slot faces and the engaging housing dogs at every refit, and never rely on cover friction to stop the radially loose outer ring.
• The PHAS PEEK cage of QJ-316-N2PHAS 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 316 N2PHAS as the qj slotted execution; the other order numbers of the QJ 316 size are different products and may carry different ratings — always quote the full designation when purchasing.