RHP7305ATSUHP4Super-Precision Angular Contact Ball Bearing – 25 mm ID, 62 mm OD, 17 mm Width, Open, 15° Contact Angle, Heavy Preload, ABEC 7

Product Description

What this part is

RHP 7305ATSUHP4 super-precision single-row angular contact ball bearing. Bore: 25 mm. Outside Diameter: 62 mm. Overall Width: 17 mm. Number Of Rows: 1. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: carbon chrome bearing steel to SAE 52100, through hardened and heat treated. Series: 7300, ISO dimension series 03, the medium series. Item Weight: 0.51 lb.

Decoding the designation

Contact Angle: 15°. Cage Material: laminated phenolic resin. Cage Type: machined, outer-ring guided. Preload: heavy. Mounting Arrangement: single universal. Precision Class: P4, equivalent to BS292 EP7, ABEC 7 and ISO Class 4. Running Accuracy – Radial And Axial Runout: P4. Searchable forms of the number: 7305ATSUHP4, 7305-A-T-SUH-P4, 7305 A T SUH P4.

What these specs mean in practice

The 7300 medium series puts a heavier ball complement and a thicker ring section into the same 25 mm bore than the 7200 or 7000 series, so it carries more load in a shorter shaft span. A 15° contact angle favours speed and radial rigidity over axial capacity. Heavy preload gives the highest axial stiffness of the four standard settings and the lowest speed ceiling, which is what a rigid, load-carrying spindle position wants rather than a high-speed one. Universal face control means the inner and outer rings are the same width and flush ground, so any two of these bearings clamp back-to-back or face-to-face at the rated preload with no custom spacer, and share load equally in tandem.

Fitting notes

Maximum Operating Temperature: 120 °C, set by the laminated phenolic cage. Lubricant: grease or oil. The high point of radial runout is marked on the bearing: a small circle or burnished spot on the inner ring face, and a V line on the outer ring outside diameter. The V line also shows the direction of the contact angle. Aligning those marks between paired bearings and opposing them to the shaft or housing eccentricity minimises assembled runout. Recommended shaft fit at P4 for a 25 mm seat is +2 to −2 µm, a mean 2 µm interference. Recommended housing fit for a locating position at 62 mm is +5 to 0 µm, a mean 5 µm clearance.

Quantity and configuration

Unit Quantity: 1 Pc. Internal Clearance: N/A. The bearing is preload-set at manufacture rather than clearance-set, so no radial clearance class applies.

Interchange guidance

Carton designations carried on this part: B7305X4TADUHEP7 and 2MM305WICRUH. The Fafnir 2MM prefix gives the 15° angle, CR is the phenolic outer-land-riding cage, and UH is the universal heavy preload that matches SUH. EP7 is the same class as P4. A 7305 in the 25° or 40° execution shares this 25 x 62 x 17 mm envelope and is a related size rather than a substitution.