387-382 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 387-382 model number is decoded

From a specification standpoint the 382 cup is the controlling half of 387 for housing design — it sets the 98.425 mm OD and the outer abutment diameter — while the 387 cone controls shaft fit at the 53.975 mm bore; the 21 mm width is the result of the two together.For a 53.975 mm shaft carrying combined load, SKF lists 387 under catalogue execution SKF 387/382: one open single-row tapered roller bearing in the inch 385-series.The code breaks down as cone/cup: the numbers before and after the slash identify the inner and outer ring sets, and the series prefix (385-series) ties the pair to a specific boundary plan. Dimensions 53.975×98.425×21 mm are the converted metric envelope. In SKF suffix language a bare 387 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. Speed planning uses two different ceilings: 5,600 r/min thermal reference and 6,700 r/min mechanical limiting speed. Note the minimum-axial-load requirement: at light radial load and high speed the rollers of 387 must still be held into the rib contact, which is another reason the catalogue recommends paired mounting with controlled setting. Dimensional interchange map: within the 38700 series at 53.975 mm bore, the 98.425 mm OD and 21 mm width are fixed by the ISO 355 plan, so any same-code bearing from another brand shares the mounting envelope; the 22.2 mm section height distinguishes this family from a 302 or 322 of the same bore, and the 640 g mass is the minimum—sealed or snap-ring executions add rotating weight above that catalogue baseline.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• On this 53.975 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 387 pair heats, loses setting control and smears the roller-rib contact.
• The 320 series at 53.975 mm bore (98.425×21 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.
• Do not mix brands or executions inside one 387 pair — matched sets are ground for a specific setting, and pairing a SKF basic unit with a different suffix variant will not share the setting evenly.
• The tapered contact angle creates an induced axial load under pure radial force; include it in the 387 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
• Shaft and housing fillets must clear the bearing chamfer so the 21 mm-wide cup seats square; use an undercut or withdrawal groove rather than an oversized radius that locks on the ring face.
• The 99.9/102 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 387 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 387/382 designation when purchasing and match the execution to the mounting arrangement.