32036T138X-DB bearing: complete specifications & equivalents
The 32036T138X-DB is a ISO 355 radial bearing sized 180 x 280 x 138 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 180 mm |
| Outer diameter D | 280 mm |
| Width B | 138 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1360 kN |
| Basic static load rating C0 | 2320 kN |
| Fatigue load limit Pu | 220 kN |
| Reference speed (thermal) | 1400 rpm |
| Limiting speed (mechanical) | 2200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 29500 g |
| Manufacturer designation | SKF 32036T138 X/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 | 7.087 in |
|---|---|
| Outer diameter D | 11.024 in |
| Width B | 5.433 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 50 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) | 23 of 30 |
| Bore above smallest matched-db-series size | 145 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 32036T138X | 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 32036T138X-DB model number is decoded
Journal and housing interface: the 180 mm bore takes a m6 shaft seat and the 280 mm outside diameter pairs with an H7 housing bore; the 138 mm width defines shoulder depth and the 29500 g mass is the dead load in thermal-growth calculations. Mounting order matters for 32036T138X-DB: seat the first bearing, fit the ground spacer, then the second bearing, and clamp axially as a unit — the 138 mm catalogue width is the assembled result and the gauge for correct assembly. Do not separate 32036T138X-DB into single-bearing service stock — as individual bearings the components are not interchangeable with catalogue single-row executions because the rings are ground for the set.32036T138X-DB (SKF 32036T138 X/DB) is the back-to-back (O) matched pair matched-set choice for a 180 mm shaft: a pair of tapered roller bearings whose combined envelope is 280×138 mm, delivered ready to mount with controlled internal clearance.The code breaks down as base bearing 32036T138 X plus matched-set suffix /DB: two bearings of the 180 mm bore size, paired back-to-back (O) matched pair, with the 138 mm overall width spanning the whole arrangement. 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 32036T138X-DB already accounts for the expected temperature gradient across the 138 mm pair width. The C0/C balance of the pair is about 1.71; combined with the 220 kN fatigue limit this frames a set sized for reversing combined load on a 180 mm shaft rather than for pure radial duty.
Typical equipment & failure modes
Common applications
- rolling-mill roll-neck bearings
- heavy-duty rolling-mill gearboxes
- large crusher and mineral-processing drives
- heavy-duty rolling-mill gearboxes
Known failure patterns
- thermal preload runaway in an O-arrangement pair when inner-ring heat expands the setting
- axial overload spalling at the roller-rib contact beyond the single-row thrust rating
- cage pocket scoring when the bearing starts cold with grease of too-high base-oil viscosity
- fretting corrosion on a loose rotating shaft seat
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- Setting is built into 32036T138X-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.
- Clamp the 32036T138X-DB pair axially through the cones, never through the rollers; pressing force across the roller complement brinells the raceways of both bearings at once.
- O and X arrangements are not interchangeable by turning the set around: 32036T138X-DB in back-to-back (O) matched pair arrangement has its load-line geometry fixed — specify the arrangement from the shaft thermal and stiffness analysis.
- The 1360/2320 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 32036T138 X/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 32036T138X-DB?
The SKF 32036T138 X/DB is a matched pair of single-row tapered roller bearings in back-to-back (O) matched pair arrangement with 180 mm bore, 280 mm outer diameter and 138 mm overall width (7.087 × 11.024 × 5.433 in). From SKF catalogue PUB BU/P1 17000: basic dynamic load rating C 1360 kN, C0 2320 kN, fatigue load limit Pu 220 kN, reference speed 1,400 r/min, limiting speed 2,200 r/min, mass about 29.50 kg.
What does the /DB suffix on 32036T138X-DB mean?
The base 32036T138 X 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 32036T138X-DB for one bearing or the pair?
They are for the complete matched pair: C 1360 kN dynamic and C0 2320 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 32036T138 X table values.
Can 32036T138X-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 180 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 180 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.