SNFAEX45-7CE1DUMAngular Contact Ball Bearing – 45 mm ID, 75 mm OD, 16 mm Width, Open, 15°, Medium Preload, Universal Duplex Pair

Product Description

What this part is

SNFA EX45-7CE1DUM super-precision angular contact ball bearing, supplied as a universally ground matched duplex pair. Bore 45 mm, outside diameter 75 mm, width 16 mm per bearing, 32 mm across the pair. ISO equivalent size 7009. SNFA is part of the SKF group.

Decoding the designation

EX is the SNFA high-speed angular contact series. 45 is the bore in millimetres. The 7 is the precision class, ABEC 7 to ISO P4. CE1 is the high-speed execution at a 15° contact angle. DUM is a duplex universal set at medium preload.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity; a 25° equivalent reverses that trade. The phenolic outer-land-riding window cage runs light and quiet at high surface speed and suits oil-mist and oil-air lubrication. Limiting speed is 18,000 rpm.

Quantity and configuration

Two bearings, matched as a set. Universal grinding means the pair can be arranged back-to-back, face-to-face or in tandem, and each ring is ground so that preload is established when the faces are clamped together.

Preload and clearance

Medium preload, set by the ground offset between the ring faces. A preloaded matched set has no operating internal clearance, so radial clearance classes such as CN do not apply to it.

Fitting notes

Rings are marked with a V or arrow across the outer diameter; the mark is aligned to preserve the ground arrangement. Shaft and housing seats are held to matching precision tolerances, and both bearings of the pair are clamped as a unit against a common shoulder.

Interchange guidance

Fafnir 2MM9109WI-DUM is a same-specification interchange at 15°, ISO 7009 size, medium preload. SKF 7009 CD/P4ADGB shares the envelope and contact angle but is supplied as a fixed back-to-back pair rather than a universal set, so it is a related arrangement. FAG B7009-C-T-P4S-UL is the same size at light preload as a universal single.