HM259048-010-HA4 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 HM259048-010-HA4 model number is decoded

Operating context for the 317.5 mm bore: a shaft of this diameter in the xl-bore band typically runs between 254000 and 381000 r/min in real machinery, and the 447.675 mm outside diameter places the housing shoulder at 456 mm outer abutment; the 85.725 mm width and 41000 g mass together set the shaft critical speed and the housing resonance check for this HM200-series envelope. Cone-and-cup identity in HM259048: the leading HM 259048 reference identifies the inner ring, rollers and cage; the trailing 010/HA4 reference identifies the outer ring. The HM259000-series series lists alternative cups for the same cone, each producing a different 447.675 mm OD or 85.725 mm width — hence a different SKU even though the bore stays at 317.5 mm.The SKF HM 259048/010/HA4 is a 317.5×447.675×85.725 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.In SKF inch-series tables HM259048 sits at 317.5 mm bore (12.5 in) with a 447.675 mm cup OD and 85.725 mm total width — dimensions that trace back to the original Timken boundary plan for the HM259000-series family. In SKF suffix language a bare HM259048 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. The 220 kN Pu figure feeds the adjusted-life equation at contaminated or partial-film conditions, and the 1.98 C0/C balance shows this execution is tuned to thrust-heavy combined loads rather than pure radial running. Fit selection follows the rotating ring — interference on a rotating cone — and two HM259048 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 317.5 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 HM259000-series inch series at 317.5 mm bore (447.675×85.725 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 HM259048 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
• Setting is a design value, not an assembly feel: excessive preload in the HM259048 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• The 41000 g mass and 85.725 mm width mean spacer and abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the contact angle and concentrates load on one rib of HM259048.
• The 1363/2700 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 HM259048 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF HM 259048/010/HA4 designation when purchasing and match the execution to the mounting arrangement.