30316 bearing: complete specifications & equivalents
The 30316 is a ISO 355 radial bearing sized 80 x 170 x 42.5 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 80 mm |
| Outer diameter D | 170 mm |
| Width B | 42.5 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 333 kN |
| Basic static load rating C0 | 320 kN |
| Fatigue load limit Pu | 36.5 kN |
| Reference speed (thermal) | 3200 rpm |
| Limiting speed (mechanical) | 4000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4150 g |
| Manufacturer designation | SKF 30316 |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB); 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 & 30300-series range
| Bore d | 3.15 in |
|---|---|
| Outer diameter D | 6.693 in |
| Width B | 1.673 in |
| ISO bore code | 16 |
| Radial section height (D−d)/2 | 45 mm |
| Smallest bore in 30300-series | 15 mm |
| Largest outer diameter in 30300-series | 500 mm |
| Width range across 30300-series | 14.25–105 mm |
| Bore position in 30300-series (smallest first) | 15 of 32 |
| Bore above smallest 30300-series size | 65 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30316 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 355 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 30316 model number is decoded
For a 80 mm shaft carrying combined load, SKF lists 30316 under catalogue execution SKF 30316: one open single-row tapered roller bearing in the heavy-OD section of the 30300 family.Digit by digit, 30316 reads as bearing type 3 (single-row tapered roller), heavy-OD section series 03, and bore reference 16 resolving to 80 mm; 170 mm OD and 42.5 mm width are the matching ISO 355 boundary values. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. 2GB); it is the dimensional series, not a separate part number. The 45.0 mm radial section height ((170−80)/2) and 4150 g catalogue mass frame a 80 mm bore bearing rated at 333 kN C — roughly 4.16 kN of dynamic capacity per millimetre of bore before application factors. Because the contact line is tapered, one 30316 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 80 mm shaft typically takes a k5 seat with an H7 housing bore.
Typical equipment & failure modes
Common applications
- rolling-mill auxiliary drives
- crane sheave and hoist gearboxes
- paper-machine and printing rolls
- construction machinery drives
Known failure patterns
- cup or cone misalignment when the separable rings are not seated square during mounting
- loose cup rotation in the housing when the specified press fit is not achieved
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- preload loss as the mounted pair relaxes, letting rollers skid and smear the raceways
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- grease degradation after long shelf storage without rotation or re-greasing
Selection pitfalls — read before you substitute
- Mount the 80 mm bore 30316 by induction heating of the cone (max 120 °C — the pressed-steel cage sets the ceiling, not the steel); driving it home through the cup or rollers brinells the tapered raceway.
- The 303 series at 80 mm bore (170×42.5 mm) carries a larger OD and higher capacity than 30216 at the same bore; the bigger section runs hotter, so re-check the 4,000 r/min speed ceiling and shoulder diameters before substituting.
- The tapered contact angle creates an induced axial load under pure radial force; include it in the 30316 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
- Setting is a design value, not an assembly feel: excessive preload in the 30316 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
- Catalogue reference speed and limiting speed are different limits: the 3,200 r/min reference is a thermal criterion under load, while the 4,000 r/min limiting value is the mechanical ceiling — observe both.
- The 333/320 kN ratings are SKF catalogue 17000 values for the basic execution; SKF can revise internal geometry without changing the order number, so keep the catalogue version (PUB BU/P1 17000/1 EN, 2018) with the specification and re-verify for critical drives.
- SKF lists several executions of 30316 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 30316 designation when purchasing and match the execution to the mounting arrangement.
Frequently asked questions
What are the dimensions and catalogue data of 30316?
The SKF 30316 is a single-row tapered roller bearing with 80 mm bore, 170 mm outer diameter and 42.5 mm width (3.15 × 6.693 × 1.673 in) per ISO 355. From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 333 kN, C0 320 kN, fatigue load limit Pu 36.5 kN, reference speed 3,200 r/min, limiting speed 4,000 r/min, mass about 4150 g. It is an open, separable bearing with a pressed-steel cage.
How does the 30316 bore code work?
The last two digits of 30316 are bore code 16, so 16 × 5 = 80 mm bore. The 170 mm OD and 42.5 mm width come from the ISO 355 dimension-series plan, shared with other tapered bearings of the same code.
What do the 30316 series and basic execution designations mean?
The leading 3 marks a single-row tapered roller bearing; the second digit 03 is the ISO 355 series (heavy-OD section). The SKF catalogue lists the ISO 355 dimension-series code after the bare number. A steeper-contact-angle variant (B suffix) is a different order number and is not interchangeable with the basic execution.
Can a single 30316 take axial load in both directions?
No — one single-row tapered roller bearing reacts thrust in one direction only, and under radial load its contact angle induces an axial force. Use two bearings as a matched pair: O (back-to-back) for a rigid, moment-resisting arrangement, X (face-to-face) where thermal expansion must be tolerated, or tandem where one-direction thrust is shared.
How does 30316 compare with a ball bearing of the same bore?
A tapered roller bearing has line contact and a steep contact angle: much higher combined axial-plus-radial capacity and shock resistance than a ball bearing of the same bore, at the cost of speed, one-direction thrust, mandatory pairing for reversing loads and a minimum axial load requirement. A ball bearing cannot be dropped into a combined-load 30316 position and vice versa — verify load direction, Fa/Fr ratio and speed before substituting.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.1 metric single-row TRB on 2026-09-26. Read our editorial & correction policy.