317-ZZ bearing: complete specifications & equivalents
The 317-ZZ is a ISO 15 radial bearing sized 85 x 180 x 41 mm (bore x OD x width) with ZZ sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 85 mm |
| Outer diameter D | 180 mm |
| Width B | 41 mm |
| Material | GCr15 |
| Seal / shield | ZZ |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 147 kN |
| Basic static load rating C0 | 146 kN |
| Fatigue load limit Pu | 5.3 kN |
| Reference speed (thermal) | 6700 rpm |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4600 g |
| Manufacturer designation | 317-2Z |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 300-series range
| Bore d | 3.346 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 1.614 in |
| ISO bore code | 17 |
| Radial section height (D−d)/2 | 47.5 mm |
| Smallest bore in 300-series | 25 mm |
| Largest outer diameter in 300-series | 190 mm |
| Width range across 300-series | 17–43 mm |
| Bore position in 300-series (smallest first) | 13 of 14 |
| Bore above smallest 300-series size | 60 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6317-RSR | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | NSK bearing NSK 6317VV on the same 85×180×41 mm envelope, but catalogue C/C0 differ (147/146 kN vs 146/97 kN) — envelope interchange only after a load check. |
| 6317-M | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×180×41 mm envelope as SKF 6317 M, but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match only after a load check. |
| 317 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 85×180×41 mm envelope and equivalent catalogue ratings; 317 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| 6317 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6317 shares the 85×180×41 mm envelope but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match, not a load-rating equivalent. |
| 6317-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6317-2Z shares the 85×180×41 mm envelope but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match, not a load-rating equivalent. |
| 6317-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6317-2RS1 shares the 85×180×41 mm envelope but catalogue C/C0 differ (147/146 kN vs 140/96.5 kN) — envelope match, not a load-rating equivalent. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the 317-ZZ model number is decoded
317-2Z is a filling-slot (notched-ring) deep-groove bearing in the legacy 300-series: the last two digits encode the bore: 317 carries code 17 = 85 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 85×180×41 mm envelope its C 147 kN and C0 146 kN ratings (Pu 5.3 kN). SKF spells the double shield 317-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 3200 r/min, mass 4600 g. These bearings are built for high purely-radial loads at moderate speeds.
Typical equipment & failure modes
Common applications
- construction equipment drives
- hoists and winch gear trains
- eccentric and vibratory conveyors
- legacy machinery repairs
Known failure patterns
- spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading
- dirt entering through the open slot area when external sealing is neglected
- edge loading from shaft deflection or housing misalignment
- rolling-contact fatigue spalling once the catalogue L10 life is exceeded
Selection pitfalls — read before you substitute
- Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 147/146 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.
- Shields on 317-ZZ retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.
- Limiting speed is just 3200 r/min: filling-slot cages and the slot geometry run cooler below that — overspeed drives cage wear and smearing.
- Filling slots let more balls be packed into the 85×180 mm envelope, which is why 317-ZZ reaches C 147 kN — but the slots also mean the two rings separate when the balls align with them, so handle it as a loose-clearance design.
- The slots sit at one angular position: on 317-ZZ, never pass the full radial load across the slot zone during mounting or the ring lip can crack.
- The fatigue load limit is 5.3 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
Frequently asked questions
What are the dimensions of 317-ZZ?
Filling-slot bearing 317-2Z measures 85×180×41 mm (3.346×7.087×1.614 in), about 4600 g.
What does the designation 317 mean?
It is the legacy 200/300 filling-slot numbering: series 300 and bore code 17 = 85 mm. Filling-slot bearings predate the 6xxx deep-groove spelling.
Can 317-ZZ take axial load?
Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads.
Why use an old 300-series bearing instead of a 62xx?
For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.