23018 bearing: complete specifications & equivalents

Specification table

Source: ISO 15 boundary-dimensions standard · extracted 2026-09-24

Standard-interchange bearing: dimensions per ISO 15; CN clearance, P0 tolerance and a stamped-steel cage are catalogue defaults unless the supplier states otherwise, and mass is a geometry-derived estimate. Brand catalogue load ratings and limiting speeds for 23018 are being backfilled — use the inquiry form for certified values.

Cross references & equivalents

No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.

How the 23018 model number is decoded

In the 23000-series (ISO 15 dimension series) the leading 2 marks a double-row spherical roller and the last two digits of 23018 encode the bore: code 18 = 90 mm (code × 5 from 04 upward). The ISO 15 envelope is 140 mm outside diameter and 37 mm width — 3.543 × 5.512 × 1.457 in, with a 25.0 mm radial section height. Two rows of symmetrical barrel rollers on a common sphered outer raceway self-align to shaft deflection while carrying heavy radial load and bidirectional axial load. Typical catalogue practice for a rotating inner ring is a k5 shaft seat, H7 housing and C3 internal clearance; K variants use a 1:12 tapered bore on an adapter sleeve — verify against the mounting arrangement.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• The large 90 mm-bore 23018 mounts with real force: use induction heating or hydraulic drive-up on the tapered seat, measure residual clearance in micrometres, and plan lifting fixtures — the 37 mm double-row assembly cannot be drifted into position without brinelling.
• The 230 series (ISO 15 dimension series 30) pairs a wide 37 mm section with a compact 140 mm OD at 90 mm bore — the radial envelope is one step smaller than the 222 medium series, so it carries heavy radial load in restricted housing space; it is not dimensionally interchangeable with a 222 or 223 row on the same bore, so verify OD and width before substitution.
• Check shaft deflection across the 23018 span: the wide 37 mm section tolerates some misalignment through the sphered raceway, but a bent shaft between two 230-series rows alternates the load path every revolution and frets both 90 mm seats — align to the catalogue angular limit under load, not at standstill.
• The 37 mm-wide 23018 seats against shaft and housing shoulders whose fillet must clear the bearing chamfer: keep the corner radius small enough that the 90 mm bore and 140 mm OD faces abut square — an undercut beats an oversized radius, which lifts the ring and edge-loads the 25.0 mm section.
• For a cylindrical-bore 23018, warm the inner ring to 80–100 °C (induction heater, never a flame) and slide it dry to the shoulder of the 90 mm shaft; cooling creates the interference, while hammering cold through the 140 mm assembly dents the sphered raceways.
• Relubricate 23018 through the W33 groove while the shaft turns slowly so fresh grease flushes the full 37 mm-wide roller set; pumping grease into a stationary bearing channels it past one row and leaves the other side of the 90 mm bore starved.
• Press 23018 using the right ring: force on the inner ring for an interference shaft fit and on the outer ring for a housing fit — transmitting mounting force through the barrel rollers brinells the sphered raceways of the 140 mm assembly.
• Match the cage to the duty: the E/CC stamped window-steel cage is the standard for general 23018 service, while the machined brass CA cage is preferred for heavy shock and vibratory applications — never replace a CA row with a CC row in a screen or crusher without re-rating.