LM12749-710 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 LM12749-710 model number is decoded

Numbering ties the bearing to its inch-series envelope: LM12749 means a cone and cup matched pair in the LM12700-series series — which is why the 22×45.237×15.494 mm outline swaps dimensionally with other inch-series bearings of the same code. In SKF suffix language a bare LM12749 is the standard execution; B marks a larger contact angle and Q or J2 mark clearance/cage variants, all quoted separately. With C 33.9 kN and C0 31 kN, the LM12749 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 15,000 r/min. Mounting practice for LM12749: the rotating cone takes the interference fit (k5 on a 22 mm shaft), the cup slides for axial location, and reversing-thrust duty demands a paired O/X set rather than one bearing. Speed envelope and thermal behaviour: at 12,000 r/min thermal reference, the 22 mm bore shaft runs at a dn of 264k, and the 11.6 mm section dissipates heat through the cup-to-housing contact path; the 15,000 r/min mechanical ceiling reflects cage strength, and the 120 g spinning cone contributes gyroscopic moment under rapid speed reversal. The cup reference 710 is structural, not a suffix: it identifies the outer ring that, combined with the LM 12749 cone, produces the 22/45.237/15.494 mm envelope catalogue-listed as LM12749. Quote the cup number in full when ordering — the LM12700-series tables contain other cups that fit the same cone but change the bearing.LM12749 is a single-row tapered roller bearing in the LM12700-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.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At a 22 mm bore the thin cone and cup are easily distorted by an over-tight shaft nut; check seat runout (target Ra ≤ 0.8 µm) and torque the locknut progressively — a pinched LM12749 shows up as gearbox vibration long before it fails.
• The LM12700-series inch series at 22 mm bore (45.237×15.494 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 33.9 kN rating of LM12749, preload class changes stiffness by tens of percent but also heat generation; select light preload for the 15,000 r/min speed end and heavier preload only where moment stiffness dominates.
• The tapered contact angle creates an induced axial load under pure radial force; include it in the LM12749 rating calculation (and account for it in both bearings of a pair) or the unloaded bearing skids its rollers.
• Never press both rings through the wrong element during fitting: force for an interference shaft seat goes through the cone only, or brinell marks on the 45.237 mm cup race release as noise within the first running hours.
• The 33.9/31 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 LM12749 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF LM 12749/710 designation when purchasing and match the execution to the mounting arrangement.