51316-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 51316-SKF model number is decoded

The 51300 series order number 51316 is a SKF single-direction thrust ball bearing for a 80 mm seat, built to ISO 104, with a flat housing seating surface, 80×140×44 mm boundary dimensions. Three separable parts make the set: the tight-bore shaft washer that locates on the shaft, the loose-bore housing washer in its register, and the ball-cage assembly; load is purely axial and acts in one direction. reading 51xxx as a code: the 1 after 5 identifies one load direction and a flat seat, and the next digit ranks the section 1 (light) to 4 (heavy) before the two-digit bore code. bore code 16 decodes to 80 mm (code 16 × 5) under the same 00/01/02/03-exception, ×5 rule SKF uses across its coded bearing ranges. the suffix-free listing carries the catalogue default: a pressed (stamped sheet-steel) ball-cage assembly, light and quiet, used across the small and medium sizes. Envelope 80×140×44 mm (3.15×5.512×1.732 in), 30.0 mm radial section, C 159 kN, C0 390 kN, Pu 13.7 kN. reference speed 1,700 r/min (thermal) and limiting speed 2,400 r/min (mechanical), catalogue mass 2700 g. Pitch-diameter arithmetic: dm = (80+140)/2 = 110.0 mm; at the 2,400 r/min limiting speed that corresponds to roughly 264k mm·r/min, the figure used when comparing cage speed demand across the thrust-ball series. Sizing arithmetic on the 80 mm bore: 159 kN C over the 30.0 mm radial section gives 5.3 kN per section millimetre, and the 44 mm stack height is 1.47× that section — proportions typical of a 51300 thrust section. At the printed limiting speed of 2,400 r/min the mean pitch diameter dm ≈ 110.0 mm implies a dn value around 264k mm·r/min; the 1,700 r/min reference speed is the thermal-planning value under catalogue load. Stack/annulus proportions: the 44 mm axial stack over the 10,367 mm² washer annulus gives 4.24 mm of height per annular square millimetre ×10⁻³, and at 2700 g the bearing holds about 144.4 kN of C0 per kilogram. Minimum-load arithmetic: with dm ≈ 110.0 mm and factor A 0.79, Fam ≈ A·(n·dm/1000)² at the 1,700 r/min reference speed is about 27.6 kN for 51316; below that preload the balls skid and smear the tracks. 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. On this 80 mm size the pressed cage and separable washers make the bearing interchangeable across brands on the ISO 104 plan, but the SKF ratings 159/390 kN are this catalogue's figures — confirm the replacement order's ratings rather than swapping on envelope alone.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Keep the applied thrust above Fam ≈ A·(n·dm/1000)² with the printed factor A 0.79; for 51316 a spring preload or the rotor weight is part of the selection at light load and high speed, because unloaded balls skid rather than roll.
• 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 159 kN track before first rotation.
• 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 51300 bearing.
• The 51316 is a pure axial bearing: it must never be subjected to radial load — any radial force on the 80 mm shaft has to be carried by a radial bearing mounted alongside it.
• Ordering discipline for 51316: the catalogue page quotes 51316 and its 159/390 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.