SNR7205CG1DUJ84Super Precision Angular Contact Ball Bearing 25x52x15 mm, 15 Degree Contact Angle, Stratified Phenolic Cage, Universal Duplex Pair Medium Preload, ISO Class 4

Product Description

What this part is

SNR Machline 7205CG1DUJ84 super-precision angular contact ball bearings, supplied as a universal duplex pair. Brand: SNR (NTN-SNR). Bore: 25 mm. Outside Diameter: 52 mm. Width: 15 mm per bearing. Total Width: 30 mm for the assembled pair. Contact Angle: 15°. Preload: Medium. Precision Class: ISO 4, P4, ABEC 7. Cage Material: stratified cotton-fabric-reinforced phenolic. Cage Type: machined, centred on and guided by the outer ring. Bearing Material: 52100 vacuum-degassed steel rings and balls. Rolling Elements: steel balls. Closure Type: open. Bore Type: straight. Internal Clearance: N/A, the set is preloaded rather than clearance-set. Series: 72, the ISO 02 dimension series. Base Number: 7205CG1.

Decoding the designation

7205: ISO 72-dimension series angular contact envelope, 25 x 52 x 15 mm. C: 15° contact angle in SNR’s scheme. G1: SNR’s high-load-capacity version code, developed for the 72 series, which is built to carry predominantly high axial loads. DU: a pair of universal bearings. J84: the 8 is the preload grade, medium; the 4 is the precision class, ISO 4 / P4 / ABEC 7. Searchable forms: 7205CG1DUJ84, 7205 C G1 DU J84, 7205-C-G1-DU-J84, 7205.C.G1.DU.J84.

What these specs mean in practice

A 15° contact angle biases the bearing toward radial load, runs cooler than a steeper angle at the same speed, and holds radial running accuracy better, at the cost of axial capacity and stiffness. The G1 version recovers axial capacity through the heavier 72-series section, which is why a 15° G1 bearing carries more thrust than its section would otherwise suggest. Medium preload gives more stiffness and positional accuracy than a light-preload set, at some cost in heat and speed headroom. Dynamic Load Rating: 17.6 kN, 3,957 lbf, per single bearing. Static Load Rating: 11.1 kN, 2,495 lbf, per single bearing. Limiting Speed: 27,000 rpm on grease and 42,000 rpm on oil. Lubricant: grease or oil. Operating Temperature Range: -30 to 120°C, set by the phenolic cage. Item Weight: 0.31 lb per bearing.

Quantity and configuration

Unit Quantity: 2 bearings, one universal duplex pair. Universal grinding leaves the inner and outer ring faces flush once preloaded, so any two bearings of this designation come up to the specified medium preload when clamped, in any arrangement and with no shims. DU additionally selects bore and outside diameter so that variation from nominal within the pair stays inside half the ISO tolerance. The pair mounts back-to-back for moment stiffness and two-direction thrust, face-to-face for tolerance of misalignment, or in tandem to double thrust capacity in one direction.

Interchange guidance

Equivalent designations: 7205C-T-DUM-P4 in world number format, B7205-C-T-P4S-DUM in Schaeffler format, 7205 CD/P4ADGA in SKF format, NSK 7205CTYNDULP4, and 2MM205WI CR DUM in Fafnir and Timken format. Related sizes in the same 25 x 52 x 15 mm envelope: the 7205A5 at 25° and the 7205A at 30°. Contact angle sets axial stiffness and speed capability.