6379-K-6320 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 6379-K-6320 model number is decoded

Load system: the 353 kN basic dynamic rating C and 400 kN static rating C0 give a C0/C balance of 1.13, and dividing C by the 65.088 mm bore yields 5.42 kN per millimetre of journal — a density metric that compares across families; the 45.5 kN fatigue limit Pu is the floor beneath which the adjusted-life calculation drops below acceptable L10 hours for a 65.088 mm shaft carrying variable duty. Cone-and-cup identity in 6379: the leading 6379 reference identifies the inner ring, rollers and cage; the trailing K-6320 reference identifies the outer ring. The 6300-series series lists alternative cups for the same cone, each producing a different 135.755 mm OD or 53.975 mm width — hence a different SKU even though the bore stays at 65.088 mm.The SKF 6379/K-6320 is a 65.088×135.755×53.975 mm single-row tapered roller bearing — an inch-series entry with an asymmetric raceway cut for thrust capacity and separable mounting.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 (6300-series) ties the pair to a specific boundary plan. Dimensions 65.088×135.755×53.975 mm are the converted metric envelope. In SKF suffix language a bare 6379 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. With C 353 kN and C0 400 kN, the 6379 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 5,000 r/min. Mounting practice for 6379: the rotating cone takes the interference fit (k5 on a 65.088 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Mount the 65.088 mm bore 6379 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 6300-series inch series at 65.088 mm bore (135.755×53.975 mm) follows the Timken cone/cup convention; substitutions must match both the cone and cup reference exactly — interchanging with another series or a metric 3xxxx bearing of the same bore changes OD, width and contact angle, so re-run the pair setting and shoulder-diameter checks before swapping.
• Setting is a design value, not an assembly feel: excessive preload in the 6379 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 6379 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
• The 6379 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 353/400 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 6379 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 6379/K-6320 designation when purchasing and match the execution to the mounting arrangement.