RHP7208TDULP5Angular Contact Ball Bearing Matched Duplex Pair 40 x 80 x 18 mm 40 Degree Contact Angle Phenolic Cage Light Preload

Product Description

What this part is

A matched duplex pair of RHP 7208 single-row angular contact ball bearings, 40 mm bore, 80 mm outside diameter, 18 mm wide each, ground together to light preload. The 7200 series is the medium section of the angular contact range, carrying more load than the 7000 light section on the same bore.

Decoding the designation

In the RHP scheme 7208 gives the ISO 72-series section and the bore code 08 for 40 mm. There is no angle letter in the designation, which in the RHP scheme sets the contact angle at 40° — a C would mean 15° and an E would mean 25°. T is a phenolic laminate cage, DU marks the pieces as a ground duplex set, L is light preload, and P5 is the ABEC 5 precision class. The carton alternate 7208TDUEP5 carries the RHP EP class code for the same pair.

What these specs mean in practice

A 40° contact angle is the steepest of the standard angular contact angles, so it carries substantially more thrust and offers higher axial stiffness than a 15° or 25° bearing of the same section, at the cost of limiting speed. That trade makes 40° the choice where axial load dominates and shaft speed is moderate. Light preload keeps running torque and heat generation down and leaves the most speed headroom of the three preload grades. A phenolic laminate cage is light, absorbs oil and runs quietly, and it is the reason the assembly suits oil-mist and oil-air lubrication rather than a high-temperature duty.

Quantity and configuration

2 Pcs, supplied as one matched duplex set. The ring faces are ground together so the pair reaches the specified light preload when the rings are clamped solid, with no shims and no measurement. Stack height for the pair is 36 mm.

Thrust direction

Each bearing on its own carries thrust in one direction, toward its loaded shoulder. Mounted back-to-back or face-to-face, the pair locates the shaft in both directions; mounted in tandem it carries a larger load in one direction only.

Fitting notes

The V etch across the two outer-ring faces aligns to give the ground arrangement, and rotating one ring relative to the other changes the preload the set was ground for. Preload is developed by clamping the rings solid against the housing shoulder and the shaft nut, so seat squareness governs the running accuracy the P5 class delivers.

Interchange guidance

Direct substitutes are an RHP or NSK 7208 duplex pair at 40°, ABEC 5 and light preload, and the equivalent BDU designation on the same section. A 7208C at 15° and a 7208E at 25° share the 40 x 80 x 18 mm envelope but are related sizes, not interchanges, because the contact angle changes both thrust capacity and speed. A P4 pair, a medium or heavy preload pair, and a steel- or polyamide-cage version of the same number are each separate parts.