RHPSuper Precision Angular Contact Ball Bearing – Straight Bore, 55 mm ID, 90 mm OD, 18 mm Width, Open, 25° Contact Angle, Universally Ground Single, Light Preload

Product Description

What this part is

An RHP 7011ETSULP4 super-precision single-row angular contact ball bearing. Bore 55 mm, outside diameter 90 mm, width 18 mm. Straight bore, open on both faces, 25° contact angle, phenolic cage. RHP is now part of NSK.

Decoding the designation

7011 is the ISO 70 dimension series at a 55 mm bore. E is the RHP and NSK code for a 25° contact angle, where C would mean 15° and no angle letter at all would mean 40°. T marks the phenolic cage. SU denotes a single bearing ground universally, so it will pair back-to-back, face-to-face or in tandem with another from the same family, and the L sets that pairing at light preload. P4 is ABEC 7.

Cross-confirmed designations

The carton also carries B7011X3TADULEP7 and the Timken Fafnir number 3MM9111WI-CR-DUL. In the RHP B-series scheme X3 means 25° and EP7 means ABEC 7; in the Fafnir scheme the 3MM prefix likewise means 25°, and 9111 maps to the ISO 7011 envelope. All three numbering systems agree on the angle and the precision class.

What these specs mean in practice

A 25° contact angle carries substantially more thrust than a 15° bearing and locates the shaft axially with greater stiffness, at the cost of a lower speed ceiling. Light preload keeps running temperature and frictional torque down while still removing internal play, which suits high-speed grinding and finishing spindles. The phenolic cage is light, self-lubricating and tolerant of momentary lubricant starvation, with a service range of -30 °C to 120 °C.

Load ratings

Basic dynamic radial load rating 28.0 kN and basic static radial load rating 24.0 kN. Limiting speed 18,000 rpm. Weight 1.63 lb.

Quantity and configuration

One bearing, universally ground for light preload when mounted as a set. Because preload is set at manufacture, radial internal clearance does not apply. Supplied without a snap ring.

Interchange guidance

The ISO base number is 7011E, also written 7011A5 in the NSK scheme. Cross-references at the same angle and class are the SKF 7011 ACDGA/P4A (extra light preload) and the FAG B7011-E-T-P4S-UL. A 7011C in the same envelope carries a 15° angle, so it is a different bearing.