NSK7017CTRDULP4YSuper-Precision Angular Contact Ball Bearing – 85 mm ID, 130 mm OD, 22 mm Width, Open, 15° Contact Angle, Light Preload, Phenolic Outer-Ring-Guided Cage, P4Y, Matched Pair

Product Description

What this part is

NSK 7017CTRDULP4Y is a super-precision single-row angular contact ball bearing, 85 mm bore, 130 mm outside diameter, 22 mm width, supplied here as a duplex universally matchable set of two.

Decoding the designation

In NSK’s super-precision scheme 7017 is the ISO 70 series size, C is a 15° contact angle, TR is a phenolic cage guided on the outer ring land and rated to 120 °C, DU is duplex universal grinding, L is light preload, and P4Y is a special NSK tolerance class held tighter than P4. The TR code is frequently misread as a polyamide cage; in NSK’s own catalogue TYN is the polyamide code and TR is phenolic.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness, where a 25° bearing in the same envelope carries more thrust and less speed. Light preload keeps the set stiff enough for accurate positioning while limiting frictional heat, which is what makes it the usual choice for the higher-speed spindle positions. An outer-ring-guided phenolic cage is light, damps cage chatter and retains oil in its fabric base, and its 120 °C rating sets the practical thermal ceiling for the bearing. P4Y tightens bore, outside diameter and runout beyond standard P4, which matters where the spindle’s total indicated runout budget is already spent elsewhere.

Quantity and configuration

Two bearings, ground as a duplex universally matchable set. Universal grinding means the pair may be assembled back-to-back, face-to-face or in tandem, developing light preload in whichever arrangement is chosen.

Fitting notes

Preloaded and clearance-set are mutually exclusive, so no internal clearance class applies. The ground face offsets develop the preload once the rings are clamped solid against each other. The phenolic cage sets a 120 °C limit on bearing operating temperature.

Interchange guidance

SKF 7017 CD/P4ADGA, FAG B7017C.T.P4S.DUL and RHP 7017CTDULP4 are same-spec interchanges, all 15° light-preload universal sets with phenolic cages. NSK 7017CTRSULP4Y shares the designation family but is a single universal rather than a duplex pair, and NSK 7017A5TRDULP4Y carries a 25° angle, so both are related sizes rather than substitutions.