NTN7009CGD2/GNP4Super Precision Angular Contact Ball Bearing Matched Pair – Straight Bore, 45 mm ID, 75 mm OD, 16 mm Width Each / 32 mm Paired, Open, 15° Contact Angle, Universal Matching, Normal Preload.

Product Description

What this part is

NTN 7009CGD2/GNP4 super-precision single-row angular contact ball bearing, supplied as a matched pair. Each bearing is 45 mm bore, 75 mm outside diameter, 16 mm width; mounted together the pair spans 32 mm. Open on both faces, high carbon chrome steel rings and steel balls, glass-fibre reinforced nylon ball-guided cage.

Decoding the designation

7009 is the ISO 70 dimension series in the 09 bore code, 45 mm. C is NTN’s 15° contact angle. GN is NTN’s normal preload class for universally matchable bearings, and P4 is ISO tolerance class 4, equivalent to ABEC 7. GD2 is an NTN internal designation and is carried here as a searchable variant only.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness; the 25° and 30° variants of the same envelope trade speed for axial capacity. Basic dynamic radial load rating is 24.4 kN (5 500 lbf) and basic static radial load rating 19.3 kN (4 350 lbf) per bearing. NTN publishes a limiting speed of 14 000 r/min on grease and 19 000 r/min on oil for this size, over an operating range of −40 to 120 °C.

Quantity and configuration

Two pieces, universally matchable, set to normal preload when mounted together. Load centre is 16 mm from the bearing face.

Fitting notes

A preloaded set carries no internal clearance value; preload and radial clearance are mutually exclusive settings. NTN gives a minimum shaft shoulder diameter of 50.5 mm, a maximum housing shoulder of 69.5 mm against the outer ring and 70.5 mm on the opposed face, with 1.0 mm and 0.6 mm maximum fillet radii at the chamfers.

Interchange guidance

Same-specification equivalents are the SKF 7009 CD/P4A, the FAG B7009-C-T-P4S and the NSK 7009CTRDUMP4. The NTN 7009AD and 7009B are related sizes at 30° and 40° contact angle rather than 15°.