NTN7218CGD2GNP4Angular Contact Ball Bearing Duplex Set – 90 x 160 x 30 mm, 15° Contact Angle, ABEC 7 / P4, Normal Preload, Universally Flush Ground, Open

Product Description

What this part is

NTN 7218CGD2/GNP4 super-precision angular contact ball bearing duplex set, 90 x 160 x 30 mm per bearing. Bore Diameter: 90 mm. Outside Diameter: 160 mm. Overall Width: 30 mm. Total Width: 60 mm. Contact Angle: 15°. Precision Class: ABEC 7 / P4. Preload: GN normal. Number Of Rows: 1 per bearing. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: High carbon chrome steel. Design Units: Metric. Series: 7200. Base Number: 7218. Part Number: 7218CGD2GNP4. Unit Quantity: 2 Pcs.

Decoding the designation

7218 — ISO 72 light series angular contact ball bearing, 90 mm bore.

C — 15° contact angle.

G — universally flush ground ring faces, so any two pieces pair straight from the box.

D2 — duplex set, two bearings supplied together.

GN — normal preload class.

P4 — ISO tolerance class 4, ABEC 7.

What these specs mean in practice

Contact Angle: 15°. The shallow angle keeps the ball load path close to radial, which holds ball centrifugal and gyroscopic effects down and lets the set run at high spindle speed. It is the angle chosen where speed and radial stiffness matter more than one-direction thrust capacity.

Precision Class: ABEC 7 / P4. Bore, outside diameter, raceway running accuracy and face runout are all held to super-precision limits, which is what makes the set suitable for a machine tool spindle rather than a general drive shaft.

Preload: GN normal. NTN grinds the set faces so that clamping the two rings together produces a fixed axial preload with no shims and no measurement on assembly. Internal Clearance is not applicable on a preloaded set: preload and clearance are mutually exclusive.

Mounting data

Shaft seat 90 mm. Housing bore 160 mm. Ring width 30 mm each. Total Width: 60 mm across the pair. The universally flush ground faces let the two pieces be arranged back-to-back, face-to-face or in tandem, with the ground offset setting the preload in each case.

Quantity and configuration

Unit Quantity: 2 Pcs. One duplex set of two universally flush ground bearings.

Interchange guidance

Cross-Reference 1: SKF 7218 CD/P4A. Cross-Reference 2: FAG B7218-C-T-P4S. Cross-Reference 3: NSK 7218CTYNP4. Cross-Reference 4: NTN 7218CG/GNP4. Cross-Reference 5: Timken 2MM218WI. Cross-Reference 6: RHP 7218CTDUL. Cross-Reference 7: Koyo 7218C. Cross-Reference 8: MRC 218R. Cross-Reference 9: SNR 7218CG1. Every one of those is a 15° execution on the ISO 7218 envelope, which is what makes the interchange valid: SKF CD, FAG C, NSK C, Timken 2MM and RHP C are all the 15° codes in their own schemes, and the MRC R denotes a 15° counterbored outer ring. A duplex set from any of them carries its own pairing and preload suffix on top of the base number. The carton also carries 7218C DUL P4, 2MM218WI CR DUL and 218HDL. Searchable variants of the manufacturer number: 7218CGD2GNP4, 7218CGD2/GNP4, 7218-C-GD2-GN-P4, 7218 C GD2 GN P4, 7218CG/GNP4.