NSK7017A5TYDTP5Precision Angular Contact Ball Bearing, 85x130x22 mm, 25° Contact Angle, Polyamide Cage, Tandem Ground, ISO Class 5 — One Bearing, Half of a Pair

Product Description

What this part is

A single precision angular contact ball bearing, 85 mm bore by 130 mm outside diameter by 22 mm wide, in the 70 dimension series, ground as one half of a tandem-matched pair.

Read this before ordering — you are buying one bearing:
The −1/2PR suffix means half of a pair: one bearing, not two. If your machine needs the tandem pair, this listing alone does not supply it.

Decoding the designation

7017 — angular contact ball bearing, 70 series, 85 mm bore
A5 — 25° contact angle in NSK’s scheme. This is worth being precise about: NSK’s plain A is 30° and C is 15°, so a 7017A and a 7017A5 are different bearings
TY — moulded polyamide resin cage
DT — tandem arrangement: both bearings face the same way
P5 — ISO tolerance class 5, equivalent to ABEC 5
−1/2PR — half of a pair; one bearing supplied

What tandem mounting actually does

A DT pair is not an alternative to DB or DF — it does a different job. Both bearings point the same direction, so they share a heavy axial load in one direction and roughly double the axial capacity, but they provide no location at all against thrust the other way. A tandem set therefore always needs something else in the arrangement to take reverse thrust, typically a third bearing facing the other way. Fitting a DT pair where the design called for DB gives you a shaft that walks under reversing load. The 25° contact angle suits this duty: more axial capacity and axial stiffness than a 15° bearing, at some cost in top speed. The polyamide cage is quiet and light but sets a temperature ceiling around the low hundreds of degrees Celsius, so oil-mist or high-temperature spindles want a different cage.

Correcting the source data

The title carried “7017E” as an alternate. E is not an NSK contact-angle letter and does not correspond to the A5 25° designation on the primary number, so it has been retained only as a loose search term and is not presented as an equivalent. The description was entirely eBay boilerplate — dead store link, shipping promises, nested font tags — and has been replaced. No country of origin is claimed.

Published ratings and mounting data

No NSK-published basic dynamic or static load rating for this exact TY / DT / P5 execution could be verified, so none is stated rather than borrowed from a differently caged or differently classed 7017. Boundary dimensions 85 x 130 x 22 mm are the ISO 70-series values and are confirmed.

Interchange guidance

Same-envelope 25° equivalents: SKF 7017 ACD/P4A (SKF AC = 25°), FAG B7017-E (FAG E = 25°), Fafnir/Timken 3MM9117WI (3MM = 25°) and NTN 7017A5. Do not substitute a 15° or 30° bearing on envelope alone. If you need the matching half, ask us — split sets often sit together in stock.