526-522 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 526-522 model number is decoded

For a 41.275 mm shaft the usual cone seat is k5 with an H7 housing when the inner ring rotates; arrange two 526 bearings as a set for two-direction location and set clearance from the load diagram, never from assembly feel. Journal and housing interface: the 41.275 mm bore takes a k5 shaft seat (upper deviation ~0.083 mm for this diameter range) and the 101.6 mm outside diameter pairs with an H7 housing bore tolerance band of 101.6.000/101.620 mm; the 34.925 mm width defines the shoulder depth, and the 1450 g cone-plus-cup assembly is the dead load on the shaft during thermal expansion calculations. Cone-and-cup identity in 526: the leading 526 reference identifies the inner ring, rollers and cage; the trailing 522 reference identifies the outer ring. The 525-series series lists alternative cups for the same cone, each producing a different 101.6 mm OD or 34.925 mm width — hence a different SKU even though the bore stays at 41.275 mm.SKF 526/522 belongs to the SKF single-row tapered roller range — the 41.275 mm bore entry in the inch 525-series, dimensioned 101.6 mm OD and 34.925 mm wide.Reading the designation: 526 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 525-series code identifies the dimensional series. The 41.275 mm bore, 101.6 mm OD and 34.925 mm width are the metric equivalents of the inch boundary dimensions. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 1.03 (static 190 kN against dynamic 184 kN), typical of a tapered roller sized for axial capacity, and the 21.6 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 41.275 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 526 pair heats, loses setting control and smears the roller-rib contact.
• The 525-series inch series at 41.275 mm bore (101.6×34.925 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.
• A single 526 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.
• Setting is a design value, not an assembly feel: excessive preload in the 526 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• Shaft and housing fillets must clear the bearing chamfer so the 34.925 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
• The 184/190 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 526 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 526/522 designation when purchasing and match the execution to the mounting arrangement.