RHPSuper Precision Angular Contact Ball Bearing Pair 17x47x14 mm, 25° Contact Angle, Light Preload, ABEC 7

Product Description

What this part is

A matched pair of super-precision angular contact ball bearings in the 17 mm bore × 47 mm outside diameter × 14 mm width envelope, the ISO 7303 size. Single row each, machined cage, universally ground so the pair reaches its specified preload when clamped solid.

Decoding the designation

This part carries several designations and they agree with one another. In 7303ETDULP4 the E is a 25° contact angle, T the machined phenolic cage, DUL duplex universal with light preload, and P4 the class equivalent to ABEC 7. In the B-series form B7303X3TADULEP7 the X3 independently gives the 25° angle and EP7 independently gives the P4 class. The Fafnir-scheme equivalent 3MM303WI CR DUL agrees again: its 3MM prefix denotes 25° and its CR element a phenolic cage riding on the outer ring land.

What these specs mean in practice

Bore: 17 mm. Outside Diameter: 47 mm. Width: 14 mm. Contact Angle: 25°. Precision Class: ABEC 7 / P4. Cage Material: Phenolic. Cage Type: Machined, outer-ring land-riding. Preload: Light. Mounting Arrangement: Universal. Series: 7300. A 25° contact angle is the thrust-biased middle choice in the super-precision range. Axial capacity and axial stiffness both rise with the angle, so a 25° pair holds a spindle’s axial position harder under cutting thrust than the 15° version of the same size, at the cost of limiting speed and added heat at equal duty. Light preload adds the least of that heat, suiting fast, moderately loaded spindles and grinding heads. The phenolic cage is rated to 120 °C, which governs ahead of the steel. The 14 mm width on a 17 mm bore places this in the heavier 73 dimension series, giving more capacity than a 72- or 70-series bearing of the same bore.

Thrust direction

Each bearing carries radial load together with thrust in one direction only. Mounted back-to-back or face-to-face the pair locates the shaft axially in both directions, one row acting in each; mounted in tandem both act in the same direction at roughly doubled capacity.

Quantity and configuration

2 Pcs. One universally ground pair, 28 mm total width when clamped solid. Universal grinding means the rings reach the specified light preload as ground in a back-to-back, face-to-face or tandem set.

Interchange guidance

RHP super-precision designations cross-reference directly to NSK, which acquired RHP and continued the numbering. The same-spec equivalents are NSK 7303A5TDULP4, where A5 is the NSK code for 25°, and Timken 3MM303WI CR DUL. A 7303C at 15°, a medium or heavy preload set, or a P5 or P6 class version shares this envelope but is a related size rather than a substitution.