3782-3720 bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch single-row TRB) · extracted 2026-09-28

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 8.2 inch 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.

Cross references & equivalents

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 3782-3720 model number is decoded

The SKF 3782/3720 is a 44.45×93.264×30.163 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.Numbering ties the bearing to its inch-series envelope: 3782 means a cone and cup matched pair in the 3700-series series — which is why the 44.45×93.264×30.163 mm outline swaps dimensionally with other inch-series bearings of the same code. The SKF catalogue adds the ISO 355 dimension-series code after the bare number (e.g. ); it is the dimensional series, not a separate part number. With C 134 kN and C0 146 kN, the 3782 pair-sizing check is dominated by the axial share: keep the equivalent load P below the rating at the required L10, remembering one bearing alone cannot cover reversing thrust at 7,000 r/min. Fit selection follows the rotating ring — interference on a rotating cone — and two 3782 units are required to take reversing thrust; keep the induced axial load inside the rated capacity when calculating the pair. Operating context for the 44.45 mm bore: a shaft of this diameter in the medium-bore band typically runs between 35560 and 53340 r/min in real machinery, and the 93.264 mm outside diameter places the housing shoulder at 101 mm outer abutment; the 30.163 mm width and 980 g mass together set the shaft critical speed and the housing resonance check for this 37800-series envelope. A single-row inch tapered bearing is quoted as a cone/cup pair because the boundary dimensions belong to the combination, not to either half alone: in 3782 the 3782 cone contributes the 44.45 mm bore and roller set, the 3720 cup contributes the 93.264 mm OD raceway, and the assembled 30.163 mm width is the catalogue value.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 44.45 mm bore, interference and temperature rise consume clearance inside a preloaded pair; calculate the residual clearance after mounting and at operating temperature — an over-tight 3782 pair heats, loses setting control and smears the roller-rib contact.
• The 320 series at 44.45 mm bore (93.264×30.163 mm) is the low-friction, higher-speed section; it carries less thrust than a 302 of the same bore, so verify the axial load share before swapping.
• O (back-to-back) pairs are stiffer against moments, X (face-to-face) pairs tolerate misalignment and thermal growth better; choosing the arrangement from the 2D drawing rather than the actual shaft thermal expansion is a common 3782 mounting error.
• Setting is a design value, not an assembly feel: excessive preload in the 3782 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• The 3782 shares its ISO 355 envelope with other tapered bearings of the same code but is not a drop-in replacement for a ball bearing: it cannot run effectively under pure radial load without a minimum axial load, and a deep-groove bearing cannot replace its combined-load duty.
• The 134/146 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 3782 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 3782/3720 designation when purchasing and match the execution to the mounting arrangement.