SKF7018CGAP4Super-Precision Angular Contact Ball Bearing 90 x 140 x 24 mm, 15 Degree Contact Angle, P4 / ABEC 7, Light Preload, Universally Matchable

Product Description

What this part is

An SKF 7018 CGA/P4 super-precision angular contact ball bearing, single row, universally matchable. Steel rings, steel balls, open on both faces.

Decoding the designation

70 — ISO 70 dimension series; bore code 18 gives a 90 mm bore.
C — 15° contact angle in SKF’s scheme.
GA — universally matchable design, light preload. GB is the medium grade and GC the heavy grade.
/P4 — ISO tolerance class 4, equivalent to ABEC 7.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity, which is the standard choice for a spindle front position. Light preload holds a lower running temperature and less frictional torque than the GB and GC grades, at some cost in axial stiffness. Universal matching means the ring faces are flush-ground to a common height, so any two rings of this designation seat together back-to-back, face-to-face or in tandem and reach the marked preload with no shim stack. P4 tolerances hold the bore, outside diameter and running accuracy to ISO class 4.

Published specifications

Bore: 90 mm (3.5433 in)
Outside diameter: 140 mm (5.5118 in)
Width: 24 mm (0.9449 in)
Contact angle: 15°
Precision class: P4 (ABEC 7)
Preload: light (GA)
Rolling elements: steel balls, single row
Closure: open both faces

Quantity and configuration

1 Pc, a universally matchable single at light preload.

Interchange guidance

ISO base number 7018. Searchable forms are 7018 CGA/P4, 7018CGA/P4, 7018CGAP4, 7018-CGA-P4 and 7018 CGA P4. A 7018 ACGA/P4 ring is the 25° version of the same envelope and is a related size, not an interchange; 7018 CGB/P4 and 7018 CGC/P4 are the medium and heavy preload grades and are likewise related sizes.