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Precision angular contact ball bearing, 85 x 130 x 22 mm, 25° contact angle, polyamide cage, ground for tandem mounting, ISO class 5 — supplied as ONE bearing, half of a pair.
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| MFR / Brand | NSK |
|---|---|
| MPN | 7017A5TYDTP5 |
| Model | 7017 A5 TY DT P5 / 3MM9117 WI CR / B-7017-E |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 85 mm |
| OD | 130 mm |
| Width | 22 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7000 |
| Condition | New |
| Base Number | 7017 |
| Industry Terms | half of a pair bearing, tandem mounted bearing, DT arrangement, 25 degree angular contact, precision spindle bearing |
| Application Types | Machine tool spindles, heavy one-direction thrust mountings, screw drives, precision gearboxes |
| Bore Shaft Size | 85 mm |
| Mpn Variants | 7017A5TYDTP5-1/2PR, 7017-A5-TY-DT-P5, 7017A5TYDTP5, 7017A5TYDT, 7017A5, 7017 |
| Arrangement Configuration | Tandem-matched pair - one half supplied |
| Precision Class | P5 (ABEC 5) |
| Additional Attributes | A tandem pair carries axial load in one direction only and provides no reverse thrust location; the arrangement needs a further opposed bearing. |
| Min Temp | -40 °C |
| Cage Type | Polyamide |
| Dynamic Load Rating | 66.5 kN |
| Static Load Rating | 64.5 kN |
| Precision Rating | ABEC 5 / P5 |
| Rolling Elements | Ball |
| Max Temp | 120 °C |
| Item Weight | 1.84 lbs |
| Cage Material | Moulded polyamide resin |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 25 degrees (NSK A5) |
| Mounting Arrangement | DT - tandem; both bearings face the same direction |
| Design Units | Metric |
| Internal Clearance | CN |
| Part Number | 7017 A5 TY DT P5 - 1/2PR |
| Cross Reference 1 | SKF 7017 ACD/P4A (AC = 25 degree) |
|---|---|
| Cross Reference 2 | FAG B7017-E (E = 25 degree) |
| Cross Reference 3 | 3MM9117WI (Fafnir / Timken, 3MM = 25 degree) |
| Cross Reference 4 | NTN 7017A5 |
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.
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
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.
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.
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.
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.
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