NU2305 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings) · extracted 2026-09-26

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 6.1 single-row cylindrical roller bearings); 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 NU2305 model number is decoded

In SKF catalogue PUB BU/P1 17000, NU2305 appears as NU 2305 ECP: an open, single-row cylindrical roller bearing in the NU2300 series, with glass-fibre reinforced polyamide cage and line-contact geometry for high radial capacity. Reading the designation: the leading NU marks a single-row cylindrical roller bearing with separable inner ring, the 23 is the ISO 15 diameter/width series (wide), and the last two digits encode the 25 mm bore; the 62 mm OD and 24 mm width follow the ISO 15 general plan. The SKF catalogue adds the ECP suffix for the standard glass-fibre reinforced polyamide cage; ECJ (pressed steel) and ECM (machined brass) are alternative executions with different speed and temperature ratings. The 18.5 mm radial section height ((62−25)/2) and 340 g catalogue mass frame a 25 mm bore bearing rated at 64 kN C — roughly 2.56 kN of dynamic capacity per millimetre of bore before application factors. Mount the separable inner ring + roller assembly onto the shaft first, then slide the outer ring into the housing; the NU design has no outer-ring ribs, so axial location of the shaft must be provided by adjacent components or a second bearing.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At a 25 mm bore the thin roller and raceway are sensitive to misalignment; keep shaft deflection within the 3–4 minute alignment limit and check seat runout (target Ra ≤ 0.8 µm) — a tilted NU2305 develops edge loading and early spalling.
• The NU2300 series at 25 mm bore (62×24 mm) is the wide-section cylindrical roller with higher capacity but lower speed limit than the standard NU300 counterpart; do not substitute without re-checking shaft shoulder diameters and dn limit.
• The 340 g mass and 24 mm width mean abutment faces must be square to the axis within the bearing's own P0 tolerance; a tilted spacer tilts the outer ring and concentrates load on one roller row of NU2305.
• Shaft and housing fillets must clear the bearing chamfer so the 24 mm-wide outer ring seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
• The 64/55 kN ratings are SKF catalogue 17000 values for the ECP polymer-cage 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 NU2305 (ECP polymer cage, ECJ pressed steel, ECM machined brass); they are not interchangeable order numbers — quote the full NU 2305 ECP designation when purchasing and match the execution to the speed and temperature requirements.