51114-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 51114-SKF model number is decoded

The 51100 series order number 51114 is a SKF single-direction thrust ball bearing for a 70 mm seat, built to ISO 104, with a flat housing seating surface, 70×95×18 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 14 decodes to 70 mm (code 14 × 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 70×95×18 mm (2.756×3.74×0.709 in), 12.5 mm radial section, C 40.3 kN, C0 120 kN, Pu 4.4 kN. reference speed 3,400 r/min (thermal) and limiting speed 4,500 r/min (mechanical), catalogue mass 350 g. Stack/annulus proportions: the 18 mm axial stack over the 3,240 mm² washer annulus gives 5.56 mm of height per annular square millimetre ×10⁻³, and at 350 g the bearing holds about 342.9 kN of C0 per kilogram. Pitch-diameter arithmetic: dm = (70+95)/2 = 82.5 mm; at the 4,500 r/min limiting speed that corresponds to roughly 371k mm·r/min, the figure used when comparing cage speed demand across the thrust-ball series. At the printed limiting speed of 4,500 r/min the mean pitch diameter dm ≈ 82.5 mm implies a dn value around 371k mm·r/min; the 3,400 r/min reference speed is the thermal-planning value under catalogue load. Sizing arithmetic on the 70 mm bore: 40.3 kN C over the 12.5 mm radial section gives 3.2 kN per section millimetre, and the 18 mm stack height is 1.44× that section — proportions typical of a 51100 thrust section. Load balance: C0 120 kN against C 40.3 kN gives a 2.98 ratio — thrust ball bearings are chosen on static rating and F_a/C0 far more often than on L10 life, while Pu 4.4 kN enters the adjusted-life check. 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 70 mm size the pressed cage and separable washers make the bearing interchangeable across brands on the ISO 104 plan, but the SKF ratings 40.3/120 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

• Identify the washers before fitting: the shaft washer has the ground, smaller bore and takes an interference fit on the 70 mm shaft, while the housing washer bore is larger and runs loose; swapping them locks the ball set and burns the tracks.
• Keep the applied thrust above Fam ≈ A·(n·dm/1000)² with the printed factor A 0.074; for 51114 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.
• When the housing seat cannot be machined square to the 70 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.
• On vertical shafts retain the loose housing washer positively with a cover or ring and verify the grease fill does not drain out of the 18 mm stack; thrust-ball bearings on horizontal shafts should have the shaft washer (the tight one) against the rotating element.
• The 40.3/120 kN figures belong to 51114 specifically (the single flat pressed steel execution of 51114); suffixed, sphered and counterpart-series order numbers are separate articles, so write the complete designation on the order and the maintenance record.