54409 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 54409 model number is decoded

Listed in SKF 17000 chapter 5, 54409 is an ISO 104 double-direction thrust ball bearing, 35 mm bore and 100 mm OD, with a sphered housing washer and U seat washer, standing 78.9 mm high before installation. Construction is a five-component stack: one central shaft washer with tracks on both faces, two outward-facing housing washers and two cage sets, which lets one housing recess accept thrust from either direction. note the bore of 54409 is 35 mm by the dimension table: the double-direction series was deliberately aligned to the 51/53 washer sets with shifted codes, so the familiar 04=20 arithmetic does not apply here. 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 35×100×78.9 mm (1.378×3.937×3.106 in), 32.5 mm radial section, C 124 kN, C0 240 kN, Pu 9 kN. Mounted height H1 86 mm includes the U 409 seat washer; the bearing alone is 78.9 mm high. reference speed 1,500 r/min (thermal) and limiting speed 2,000 r/min (mechanical), catalogue mass 3000 g. At the printed limiting speed of 2,000 r/min the mean pitch diameter dm ≈ 67.5 mm implies a dn value around 135k mm·r/min; the 1,500 r/min reference speed is the thermal-planning value under catalogue load. Pitch-diameter arithmetic: dm = (35+100)/2 = 67.5 mm; at the 2,000 r/min limiting speed that corresponds to roughly 135k mm·r/min, the figure used when comparing cage speed demand across the thrust-ball series. Preload at the mechanical ceiling: repeating Fam ≈ A·(n·dm/1000)² with factor A 0.37 at the 2,000 r/min limiting speed raises the required axial preload to about 6.7 kN; the reference-speed value 3.8 kN is the thermal design point. Mass and section check: 3000 g inside the 35×100×78.9 mm outline leaves a 32.5 mm radial section, and the 240 kN static rating is 1.94× the dynamic rating — plan static safety and minimum preload against those figures. Bore-to-OD planning: OD 100 over bore 35 is a 2.86× step for this size, and the 78.9 mm height gives a bore/height ratio of 0.44; use these ratios when the housing recess around the 35 mm shaft is the first constraint. Bidirectional self-aligning note: TWO U seat washers are required for this order number, one behind each housing washer, and the catalogue H1 height includes them on both sides of the stack; the spherical interfaces accept initial misalignment in either load direction but are not pivots for continuous oscillation. At 35×100×78.9 mm the bearing carries C0 240 kN bidirectionally, but the two U interfaces share that load only if each is free to seat; torque the covers so the 7.1 mm-per-side washer steps are not pre-clamped.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Order TWO seat washers for 54409 — the designation U 409 pairs with one side and a second U washer (same number) with the other; the catalogue 86 mm H1 includes both.
• Minimum load factor A 0.37 applies to both load directions, and both brass pressed cage sets need lubricant reaching the upper track on a vertical shaft.
• Assembly is a five-component stack (central shaft washer, two cage sets, two sphered housing washers) plus the two U seat washers in the housing registers; dry-build the arrangement by hand first to confirm both sides swivel freely.
• The two spherical interfaces accommodate initial misalignment in either load direction but must stay clean, greased and static — continuous rocking frets the sphered contacts of even the 240 kN static-rated set.
• Catalogue ratings are SKF PUB BU/P1 17000 figures for 54409 as the double sphered pressed steel execution; other order numbers of the 54409 size are different products and may carry different ratings or seating geometry — always quote the full designation including the U 409 seat washer when purchasing.