RHP7919CTDULP4Extra-Thin Section Super Precision Angular Contact Ball Bearing 95x130x18 mm, 15° Contact Angle, Phenolic Cage, ABEC 7, Light Preload, Universally Ground, Single Bearing (Half Pair)

Product Description

Part identity

A single-row super precision angular contact ball bearing in the ISO 79-series extra-thin section, built for machine tool spindle positions that need a large bore in a small housing envelope. Brand: RHP (now NSK). Manufacturer: RHP (now NSK). Part Number: 7919CTDULP4-1/2PR. Base Number: 7919C. Series: 79 (ISO extra-thin section), 7919. Bearing Type: super precision angular contact ball bearing, single row, extra-thin section. Condition: New. Unit Quantity: 1 bearing. Manufacturer Status: the RHP brand is discontinued and the super precision line is continued by NSK.

Dimensions and section

Bore d: 95 mm. Outside Diameter D: 130 mm. Width B: 18 mm. Radial wall: 35 mm across a 95 mm bore. Bore Type: straight. Design Units: Metric.

Designation decode

79 denotes the ISO 79-series extra-thin cross section, thinner again than the 70-series light section. 19 is the bore code for a 95 mm bore. C denotes the 15° nominal contact angle in the RHP/NSK scheme. T denotes the machined phenolic cage. DUL denotes duplex, universally ground, light preload. P4 denotes ISO tolerance class 4, equivalent to ABEC 7. The -1/2PR suffix denotes one half of a pair, so the sale unit is a single bearing.

Precision, preload and cage

Precision Class: P4 (ISO class 4, ABEC 7). Precision Rating: ABEC 7 / P4. Preload: light (L). Contact Angle: 15° (C, RHP/NSK scheme). Internal Clearance: N/A — a preloaded universally ground set carries no radial clearance class. Cage Type: machined one-piece cage, outer-land-riding. Cage Material: phenolic resin (T). Rolling Elements: balls. Number Of Rows: 1. Closure Type / Seal Type: open. Lubricant: oil or grease. Min Temp: -30 °C. Max Temp: 120 °C. Harmonization Code: 8482.10.50.

Section, angle and preload consequence

The extra-thin 79-series section is what this bearing is chosen for: a compact, light spindle with a large through-bore available for a drawbar, coolant tube or cable run. Smaller balls in a thinner section carry less load and follow the form of the seat more readily than a 70- or 72-series bearing on the same shaft, so seat roundness and rigidity govern the running accuracy achieved. The 15° contact angle suits that section, keeping ball loading and cage stress low so the bearing runs fast and cool and favours radial stiffness over axial. Light preload eliminates ball skidding and gives predictable stiffness while generating the least heat of the three grades, which matters in a thin section with less mass available to conduct heat away.

Cage behaviour

The phenolic cage is light and quiet and holds oil within its own porosity, so phenolic-caged bearings tolerate marginal lubrication better than metal-caged ones. The cage material also sets the assembly’s maximum operating temperature.

Arrangement and configuration

Arrangement / Configuration: universally ground for duplex mounting (DB, DF or DT), supplied as a single bearing. Mounting Arrangement: universal. Any two bearings of this same designation come up to the specified light preload with no shims and no regrinding. Each orientation carries a different consequence: DB gives maximum radial and moment stiffness, DF tolerates misalignment between shaft and housing, and DT shares thrust in one direction across both rows.

Cross-references

Cross-Reference: NSK 7919CTRDULP4; NSK 7919CTYNDULP4; 71919 / 71919C, the alternative ISO-style designation for the same extra-thin envelope; SKF 71919CD/P4A; SKF 71919 CDGA/P4A; FAG B71919C.T.P4S; NTN 7919CGD2GLP4, where GD2GL denotes universally ground duplex light preload. 7919X2 is carried from the source data as a search term; the X2 element is not decoded from a manufacturer source. MPN Variants: 7919CTDULP4-1/2PR; 7919CTDULP4; 7919C-T-DUL-P4; 7919-C-T-DUL-P4; 7919 C T DUL P4; 7919CTDUL; 7919C; 7919; 71919C; 71919. Functional equivalence within the 95 x 130 x 18 mm envelope requires a match on all four of envelope, contact angle, tolerance class and preload grade.

Typical applications

Compact machine tool spindles, grinding spindles, rotary and indexing tables, robot joints, precision gearboxes, harmonic drive supports and test rigs. Compatible With: RHP/NSK 7919C / 71919C super precision spindle positions of matching contact angle, tolerance class and preload grade. Industry Terms: spindle bearing; thin section angular contact; extra-thin bearing; super precision bearing; universally ground; duplex bearing; matched pair bearing; phenolic cage bearing; ABEC 7 bearing; machine tool bearing.