51116-SKF bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-28

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); 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 51116-SKF model number is decoded

Listed in SKF 17000 chapter 5, 51116 is an ISO 104 single-direction thrust ball bearing, 80 mm bore and 105 mm OD on a flat housing seat, standing 19 mm high before installation. The bearing is delivered as separate, interchangeable parts: a ground-bore shaft washer, a loose-bore housing washer and the ball-cage assembly between them, designed for one axial load direction only. 51xxx breaks down as 5 for thrust ball, 1 for one load direction on a flat seat, a section digit 1–4 light-to-heavy, then the two-digit bore code. reading the ending 16: bore 80 mm (code 16 × 5) for this single-direction size, via the standard exceptions 00/01/02/03 and ×5 above them. no cage suffix means the standard stamped steel retainer — a pressed sheet-metal ball-cage assembly that covers the bulk of the thrust-ball assortment. Envelope 80×105×19 mm (3.15×4.134×0.748 in), 12.5 mm radial section, C 44.9 kN, C0 140 kN, Pu 5.1 kN. reference speed 3,000 r/min (thermal) and limiting speed 4,300 r/min (mechanical), catalogue mass 420 g. Static-first selection data: 140 kN C0 spread across the 19 mm stack gives 7.4 kN of static rating per height millimetre, and the 420 g mass/C0 ratio is about 3 g per static kN — crane-hook and screw positions are normally sized on these two figures. Speed band width for this size is 1,300 r/min between reference and limiting (1.43× ratio); lubrication, preload and heat removal decide where inside that band 51116 can actually run. Capacity density: 44.9 kN C from 0.420 kg of bearing steel gives about 106.9 kN per kilogram; static density is correspondingly 333.3 kN/kg at C0 140 kN. Mass and section check: 420 g inside the 80×105×19 mm outline leaves a 12.5 mm radial section, and the 140 kN static rating is 3.12× the dynamic rating — plan static safety and minimum preload against those figures. Stack/annulus proportions: the 19 mm axial stack over the 3,632 mm² washer annulus gives 5.23 mm of height per annular square millimetre ×10⁻³, and at 420 g the bearing holds about 333.3 kN of C0 per kilogram. Execution note for this order number: the flat housing seating surface must be machined square to the shaft axis and supported across the full washer face — unlike the sphered 53-series execution this pressed-cage 51-series bearing has no self-aligning capability at all, so seat squareness is checked at mounting, not compensated in service. Inspection after removal of a 19 mm-high stack means checking both washer faces: the loose housing washer often shows the first false-brinell marks under machine vibration even though the tight shaft washer carries the rotating load of 44.9 kN C.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• When the housing seat cannot be machined square to the 80 mm shaft, the sphered 53-series execution of this size with its U seat washer is the self-aligning counterpart of this flat 51100 bearing.
• Heat the shaft washer to at most 120 °C for mounting, or press it via a sleeve on its ground bore — force applied through the housing washer or the ball set brinells the 44.9 kN track before first rotation.
• A 51-series bearing reacts thrust in one direction only — reversing positions need a mirrored single-direction pair or a 52-series double-direction unit; fitting a single 51116 against two-way load lifts the loose washer off its raceway.
• The third digit grades the section: 511 light, then 512, 513 and 514 progressively taller and heavier at the same bore — select from 44.9/140 kN and the available 105 mm OD, never substitute a lighter series for a heavier one without rechecking C and C0.
• Ordering discipline for 51116: the catalogue page quotes 51116 and its 44.9/140 kN ratings as one exact article; bare-number substitutions from another series or brand need a fresh dimension and rating check, not a like-for-like assumption.