18690-18620 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB) · extracted 2026-09-28

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB); 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 18690-18620 model number is decoded

Dimensional interchange map: within the 18600 series at 46.038 mm bore, the 79.375 mm OD and 17.462 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 16.7 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 330 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline. A single-row inch tapered bearing is quoted as a cone/cup pair because the boundary dimensions belong to the combination, not to either half alone: in 18690 the 18690 cone contributes the 46.038 mm bore and roller set, the 18620 cup contributes the 79.375 mm OD raceway, and the assembled 17.462 mm width is the catalogue value.SKF 18690/18620 belongs to the SKF single-row tapered roller range — the 46.038 mm bore entry in the inch 18600-series, dimensioned 79.375 mm OD and 17.462 mm wide.The 18600-series series assigns 46.038 mm bore, 79.375 mm OD and 17.462 mm width to 18690; the cone and cup references are not interchangeable with other inch-series pairs even when the bore matches, because the cup profile and rib geometry are series-specific. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. ); it is the dimensional series, not a separate part number. Speed planning uses two different ceilings: 7,000 r/min thermal reference and 8,500 r/min mechanical limiting speed. A single 18690 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 46.038 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 18690 pair heats, loses setting control and smears the roller-rib contact.
• The 18600-series inch series at 46.038 mm bore (79.375×17.462 mm) follows the Timken cone/cup convention; substitutions must match both the cone and cup reference exactly — interchanging with another series or a metric 3xxxx bearing of the same bore changes OD, width and contact angle, so re-run the pair setting and shoulder-diameter checks before swapping.
• A single 18690 cannot locate the shaft axially in both directions; mounting it singly on a reversing-thrust shaft leaves one direction uncontrolled — always use an O or X matched pair for bidirectional location.
• O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 18690 mounting error.
• The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.
• The 61.1/62 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
• SKF lists several executions of 18690 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 18690/18620 designation when purchasing and match the execution to the mounting arrangement.