RHP7018CTDUMP2Matched Duplex Pair Angular Contact Ball Bearings 90x140x24 mm 15° Medium Preload ABEC 9

Product Description

What this part is

RHP 7018-C-T-DUM-P2, a matched duplex pair of single-row angular contact ball bearings. Boundary dimensions 90 mm bore × 140 mm outside diameter × 24 mm width per bearing.

Decoding the designation

70 – single-row angular contact ball bearing, ISO dimension series 10
18 – bore code, 18 × 5 = 90 mm bore
C – 15° contact angle in the RHP scheme
T – phenolic cage
DU – duplex, a pair ground to run together
M – medium preload
P2 – ABEC 9 precision class, RHP equivalent EP9

What these specs mean in practice

ABEC 9 is the tightest class in general production use, holding bore, outside diameter and running accuracy inside roughly half the P4 limits, which is what buys spindle runout in the sub-micron range. The 15° contact angle favours speed and radial stiffness over thrust capacity. Mounted as a duplex pair the set locates the shaft in both directions under a built-in medium preload, giving higher stiffness than a light-preload set at the cost of more heat at the same speed.

Published specifications

Bore: 90 mm (3.5433 in)
Outside diameter: 140 mm (5.5118 in)
Width: 24 mm (0.9449 in) per bearing
Total width mounted: 48 mm (1.8898 in)
Contact angle: 15°
Rows: 1 per bearing
Preload: medium (M)
Precision class: P2 (ABEC 9), RHP equivalent EP9
Cage: phenolic
Closure: open

Quantity and configuration

2 Pcs, one matched duplex pair.

Fitting notes

The pair mounts as a unit in the orientation marked on the outer rings, ground faces together, so preload comes from the matched ring-face offset rather than from clamp-up force. At ABEC 9 the shaft and housing seats carry the accuracy: seat roundness and squareness transfer directly into spindle runout, so the mating geometry is held to the same order as the bearing. Full preload develops once the inner rings are clamped solid against the shaft nut and the outer rings against the housing shoulder.

Interchange guidance

Same-spec 15° medium-preload ABEC 9 duplex equivalents in other schemes: RHP B-series B7018X2TADUMEP9, NSK 7018CTRDUMP2, FAG B7018-C-T-P2-UM, Fafnir 2MM9118WI-CR-DUM in its P4S grade. The P4 grade of the same number, light and heavy preload forms, and the 25° 7018-E form are related sizes in the same envelope rather than interchanges.