87737-87111 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 87737-87111 model number is decoded

Because the contact line is tapered, one 87737 reacts thrust in a single direction; bidirectional shafts need an O or X pair, and a rotating cone on a 187.325 mm shaft typically takes a m6 seat with an H7 housing bore. Cross-section geometry: the 47.6 mm half-section ((282.575−187.325)/2) of this 87700-series unit places the roller large-end pitch diameter at roughly 234 mm, and the 50.8 mm axial width is split between cone (28 mm) and cup rib (23 mm) — a geometry that sets the contact angle and, with the 9900 g rotating cone mass, the critical speed at which cage-roller imbalance begins. Inch tapered bearings are matched sets, not mix-and-match components: 87737 pairs the 87737 cone with the 87111 cup under the 87000-series boundary plan, and although the same cone shows up against other cups in the catalogue, each pairing yields a distinct assembled width and a distinct rating row.SKF 87737/87111 belongs to the SKF single-row tapered roller range — the 187.325 mm bore entry in the inch 87000-series, dimensioned 282.575 mm OD and 50.8 mm wide.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 (87000-series) ties the pair to a specific boundary plan. Dimensions 187.325×282.575×50.8 mm are the converted metric envelope. SKF lists the plain number as the basic execution; letter suffixes such as B denote a steeper contact angle and are different order numbers. Selection arithmetic: the C0/C ratio is about 1.63 (static 695 kN against dynamic 427 kN), typical of a tapered roller sized for axial capacity, and the 67 kN fatigue load limit Pu is the equivalent-load floor used in the life calculation.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• At 187.325 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 87000-series inch series at 187.325 mm bore (282.575×50.8 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.
• When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 87737 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
• When the outer ring rotates, reverse the fit logic and provide cup location; the tapered contact of 87737 pushes the rings apart under load, so a non-located cup walks its seat even when the shaft is fixed.
• 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 427/695 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 87737 (basic, B steeper angle, Q/J2 clearance variants); they are not interchangeable order numbers — quote the full SKF 87737/87111 designation when purchasing and match the execution to the mounting arrangement.