RHP7208ETDULP4Super-Precision Angular Contact Ball Bearing 40x80x18 mm 25 Degree ABEC 7 Duplex Light Preload Pair

Product Description

What this part is

A super-precision angular contact ball bearing in the 7208 size, supplied as a factory-matched duplex pair. Bore 40 mm, outside diameter 80 mm, width 18 mm per bearing.

Decoding the designation

7208 — ISO angular contact 72-series: 40 mm bore, 80 mm outside diameter, 18 mm width.
E — 25° contact angle in the RHP scheme, the same class as the X3 suffix in the RHP B-series numbering.
T — phenolic laminated-fabric cage.
DUL — duplex universal pair, light preload.
P4 — ABEC 7 precision class.

What these specs mean in practice

A 25° contact angle is the middle of the angular contact range: it carries appreciably more thrust and gives greater axial stiffness than a 15° bearing in the same envelope, and accepts a lower speed limit and more heat generation in exchange. Light preload keeps friction and temperature rise at the low end of the three preload grades while retaining the stiffness the 25° angle contributes. The phenolic cage is light and self-lubricating, and sets a lower temperature ceiling than machined bronze.

Quantity and configuration

2 Pcs — one matched duplex pair. Universal grinding allows the pair to be assembled back-to-back, face-to-face or in tandem.

Fitting notes

The preload is ground into the ring faces and is realised only when both inner rings and both outer rings are clamped solidly against their seats. Alignment marks on the outer ring faces set the intended arrangement.

Interchange guidance

The RHP B-series equivalent is B7208X3TADULEP7. Same-envelope 7208 bearings at a 15° or 40° contact angle, or at medium or heavy preload, are related sizes rather than interchanges.