1988-1922 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 1988-1922 model number is decoded

Catalogue mass 230 g for the 28.575×57.15×19.845 mm open execution covers the pressed-steel cage and standard roller complement; sealed or special-clearance variants differ slightly in mass and carry their own order numbers. For a 28.575 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 1988 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Load system: the 58.2 kN basic dynamic rating C and 55 kN static rating C0 give a C0/C balance of 0.95, and dividing C by the 28.575 mm bore yields 2.04 kN per millimetre of journal — a density metric that compares across families; the 6 kN fatigue limit Pu is the floor beneath which the adjusted-life calculation drops below acceptable L10 hours for a 28.575 mm shaft carrying variable duty. Cone-and-cup identity in 1988: the leading 1988 reference identifies the inner ring, rollers and cage; the trailing 1922 reference identifies the outer ring. The 1900-series series lists alternative cups for the same cone, each producing a different 57.15 mm OD or 19.845 mm width — hence a different SKU even though the bore stays at 28.575 mm.For a 28.575 mm shaft carrying combined load, SKF lists 1988 under catalogue execution SKF 1988/1922: one open single-row tapered roller bearing in the inch 1900-series.In SKF inch-series tables 1988 sits at 28.575 mm bore (1.125 in) with a 57.15 mm cup OD and 19.845 mm total width — dimensions that trace back to the original Timken boundary plan for the 1900-series family. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 28.575 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 1988 pair heats, loses setting control and smears the roller-rib contact.
• The 1900-series inch series at 28.575 mm bore (57.15×19.845 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.
• At the 58.2 kN rating of 1988, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 12,000 r/min speed end and heavier preload only where moment stiffness dominates.
• Do not mix brands or executions inside one 1988 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.
• Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 57.15 mm cup race release as noise within the first running hours.
• The 58.2/55 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 1988 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 1988/1922 designation when purchasing and match the execution to the mounting arrangement.