M336949-912 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 M336949-912 model number is decoded

In SKF suffix language a bare M336949 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. At 1,800 r/min reference speed the 42.6 mm-section M336949 is governed thermally by preload and lubricant flow; grease or oil selection should be made against that value, with 2,200 r/min as the mechanical ceiling. A single M336949 locates the shaft in one axial direction only; mount it against a second bearing in O (back-to-back) or X (face-to-face) arrangement, and set the running clearance by the mounting procedure — not by feel. Cross-section geometry: the 42.6 mm half-section ((265.112−179.934)/2) of this M3300-series unit places the roller large-end pitch diameter at roughly 222 mm, and the 51.595 mm axial width is split between cone (28 mm) and cup rib (23 mm) — a geometry that sets the contact angle and, with the 9400 g rotating cone mass, the critical speed at which cage-roller imbalance begins. Cone-and-cup identity in M336949: the leading M 336949 reference identifies the inner ring, rollers and cage; the trailing 912 reference identifies the outer ring. The M336900-series series lists alternative cups for the same cone, each producing a different 265.112 mm OD or 51.595 mm width — hence a different SKU even though the bore stays at 179.934 mm.M336949 is a single-row tapered roller bearing in the M336900-series inch series: a separable cone-and-cup design for combined radial and one-direction axial load, listed by SKF in SKF catalogue PUB BU/P1 17000.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 (M336900-series) ties the pair to a specific boundary plan. Dimensions 179.934×265.112×51.595 mm are the converted metric envelope.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 179.934 mm bore the cone mass is high enough that cocking during mounting damages the cage and rib; guide the ring square, confirm seat contact around the full circumference, and re-check setting after the first thermal cycle of the paired set.
• The M336900-series inch series at 179.934 mm bore (265.112×51.595 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.
• At the 532 kN rating of M336949, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 2,200 r/min speed end and heavier preload only where moment stiffness dominates.
• Setting is a design value, not an assembly feel: excessive preload in the M336949 pair raises operating temperature and can trigger thermal runaway, while too little lets the rollers skid and smear the raceway under light load.
• The pressed-steel cage is rated for standard industrial service; sustained running above the limiting speed or with degraded lubricant wears the cage pockets — inspect the cage at every relubrication interval.
• The 532/880 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 M336949 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF M 336949/912 designation when purchasing and match the execution to the mounting arrangement.