30326T142-DB bearing: complete specifications & equivalents
The 30326T142-DB is a ISO 355 radial bearing sized 130 x 280 x 142 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 130 mm |
| Outer diameter D | 280 mm |
| Width B | 142 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1165 kN |
| Basic static load rating C0 | 1600 kN |
| Fatigue load limit Pu | 163 kN |
| Reference speed (thermal) | 1400 rpm |
| Limiting speed (mechanical) | 2400 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 36500 g |
| Manufacturer designation | SKF 30326T142/DB |
| Standard | ISO 355 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants |
| Last verified | 2026-09-29 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants) · extracted 2026-09-29
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants); 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 & matched-db-series range
| Bore d | 5.118 in |
|---|---|
| Outer diameter D | 11.024 in |
| Width B | 5.591 in |
| ISO bore code | 42 |
| Radial section height (D−d)/2 | 75 mm |
| Smallest bore in matched-db-series | 35 mm |
| Largest outer diameter in matched-db-series | 480 mm |
| Width range across matched-db-series | 41.5–288 mm |
| Bore position in matched-db-series (smallest first) | 18 of 30 |
| Bore above smallest matched-db-series size | 95 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 30326T142 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 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 30326T142-DB model number is decoded
The rotating cones of 30326T142-DB take a m6 seat on the 130 mm shaft; the cups are a transition-to-loose fit so the pair can be clamped to its factory setting during assembly.The SKF 30326T142/DB is a 130×280×142 mm matched tapered-roller set — two single-row bearings in back-to-back (O) matched pair arrangement, ground and shipped together with the axial clearance fixed at the factory.Digit by digit, 30326T142-DB reads as the ISO 355 base bearing 30326T142 supplied as a back-to-back (O) matched pair matched pair (/DB); the 130 mm bore and 280 mm OD are per-bearing, the 142 mm width is for the set. Back-to-back matching puts the large rib ends outward — the stiffest arrangement for moment load, but one that converts shaft thermal growth into preload change; the factory setting of 30326T142-DB already accounts for the expected temperature gradient across the 142 mm pair width. Catalogue mass 36500 g covers both bearings and the ground spacer of 30326T142-DB; keep the set complete — substituting one bearing or a non-ground spacer destroys the factory clearance. Material and manufacturing detail: the 36500 g catalogue mass reflects through-hardened bearing steel machined to the listed envelope; ring roundness and width tolerance keep the mounted-setting scatter inside the catalogue class. Mounting order matters for 30326T142-DB: seat the first bearing, fit the ground spacer, then the second bearing, and clamp axially as a unit — the 142 mm catalogue width is the assembled result and the gauge for correct assembly.
Typical equipment & failure modes
Common applications
- large industrial mixer shafts
- offshore winch and drawworks drums
- rolling-mill roll-neck bearings
- wind-turbine main shafts
Known failure patterns
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- uneven load sharing in a pair when spacer faces are not parallel to the bore
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- hard-particle indentation of the tapered raceway in unfiltered oil
- brinelling from pressing the cone or cup home through the rollers
Selection pitfalls — read before you substitute
- Clamp the 30326T142-DB pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- Spacer faces must stay parallel within the set's own tolerance; a tilted spacer in 30326T142-DB concentrates reversing thrust on one bearing and shows up as one-sided raceway wear.
- Setting is built into 30326T142-DB; the classic field error is re-adjusting a matched pair as if it were two loose single bearings, which destroys the /DB clearance class.
- The 1165/1600 kN ratings are SKF catalogue 17000 values for this 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.
- Quote the full SKF 30326T142/DB designation when purchasing — base-number-only orders are ambiguous across executions and variants.
Frequently asked questions
What are the dimensions and catalogue data of 30326T142-DB?
The SKF 30326T142/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 130 mm bore, 280 mm outer diameter and 142 mm overall width (5.118 × 11.024 × 5.591 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1165 kN, C0 1600 kN, fatigue load limit Pu 163 kN, reference speed 1,400 r/min, limiting speed 2,400 r/min, mass about 36.50 kg.
What does the /DB suffix on 30326T142-DB mean?
The base 30326T142 is the ISO 355 single-row bearing; the /DB suffix marks the matched-set execution — the arrangement (back-to-back (O)), the ground spacer and the factory-set axial clearance class. A matched set cannot be assembled from loose single bearings; quote the full designation when ordering.
Are the C and C0 ratings of 30326T142-DB for one bearing or the pair?
They are for the complete matched pair: C 1165 kN dynamic and C0 1600 kN static already include load sharing between the two bearings. Do not halve them for single-bearing checks, and do not compare them directly with the single-row 30326T142 table values.
Can 30326T142-DB be adjusted like two loose tapered bearings?
No — the axial clearance is set at the factory by selective spacer grinding. Mounting work is limited to clean seats, correct fits (m6 on a rotating 130 mm shaft) and axial clamping through the cones; re-setting in the field destroys the matched clearance class.
When should a back-to-back (O) matched set be chosen?
Choose the back-to-back (O) set where moment stiffness dominates — pinion supports, gearbox output shafts, crane sheaves. The diverging load lines give the widest effective spread at the 130 mm bore.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.3-8.8 TRB variants on 2026-09-29. Read our editorial & correction policy.