68450-68712 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 68450-68712 model number is decoded

Reading the designation: 68450 follows the Timken-style inch convention — the cone (inner ring with rollers) and cup (outer ring) are quoted as a pair separated by a slash, and the 68000-series code identifies the dimensional series. The 114.3 mm bore, 180.975 mm OD and 34.925 mm width are the metric equivalents of the inch boundary dimensions. 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. With C 227 kN and C0 280 kN, the 68450 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 3,400 r/min. Because the contact line is tapered, one 68450 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 114.3 mm shaft typically takes a m6 seat with an H7 housing bore. Journal and housing interface: the 114.3 mm bore takes a m6 shaft seat (upper deviation ~0.229 mm for this diameter range) and the 180.975 mm outside diameter pairs with an H7 housing bore tolerance band of 180.975.000/180.995 mm; the 34.925 mm width defines the shoulder depth, and the 2950 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. From a specification standpoint the 68712 cup is the controlling half of 68450 for housing design — it sets the 180.975 mm OD and the outer abutment diameter — while the 68450 cone controls shaft fit at the 114.3 mm bore; the 34.925 mm width is the result of the two together.SKF 68450 (SKF 68450/68712) is the 68000-series tapered roller choice for a 114.3 mm shaft — one row of tapered rollers on an asymmetric raceway inside the 180.975×34.925 mm envelope.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 114.3 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.
• The 68000-series inch series at 114.3 mm bore (180.975×34.925 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.
• When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 68450 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
• Do not mix brands or executions inside one 68450 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.
• Catalogue reference speed and limiting speed are different limits: the 2,800 r/min reference is a thermal criterion under load, while the 3,400 r/min limiting value is the mechanical ceiling — observe both.
• The 227/280 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 68450 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 68450/68712 designation when purchasing and match the execution to the mounting arrangement.