SKF K 81115 TN cylindrical roller thrust bearing ASSEMBLY (roller-and-cage only — no washers). IMPORTANT — in SKF nomenclature the K prefix on the 811xx / 812xx cylindrical roller thrust series denotes the ROLLER-AND-CAGE ASSEMBLY on its own: cylindrical rollers held in a glass-fibre-reinforced PA66 polyamide cage (TN suffix), with NO shaft washer and NO housing washer supplied. The complete bearing is 81115 TN (no K prefix) and consists of the K assembly + the shaft washer WS 81115 + the housing washer GS 81115 — SKF sells all three parts SEPARATELY so the operator can either (a) install the K assembly directly between adjacent shaft-and-housing surfaces that are already machined and hardened to serve as raceways (a compact axial-carry design that minimises section height), or (b) combine K + WS + GS into a complete drop-in 81115 TN bearing. K 81115 TN dimensions: bore d = 75 mm, outside diameter D = 100 mm, assembly height for the K roller-and-cage alone (approximately half the full bearing height — the full 81115 TN complete bearing measures 19 mm high per SKF General Rolling Bearings catalogue). Verify exact K-alone height against the current SKF product page for the specific installation. Companion parts SKF publishes as separate spares: WS 81115 shaft washer — hardened carbon-chromium bearing steel with precision-ground raceway; GS 81115 housing washer — hardened bearing steel. Load ratings for the FULL 81115 TN bearing (K + WS + GS installed): consult the current SKF product page for verified dynamic C, static C0, fatigue Pu, mass, and grease/oil reference and limiting speeds — these values should be pulled from SKF's own product data URL (skf.com/.../productid-81115%20TN) rather than from third-party summaries. TN suffix: glass-fibre-reinforced PA66 polyamide cage — SKF-standard temperature service commonly cited as ~120 C continuous (industry norm for PA66-GF; verify against the specific SKF 811xx product page for the specific application). MP suffix denotes a machined-brass cage (window-type) used where higher continuous temperature or oil-additive incompatibility with PA66 is a concern; MP is the higher-service upgrade path. Cross-reference to other bearing makers (dimensional interchange per ISO 104 fixed boundary dimensions holds across all major makers; load ratings vary +/- 10-30 percent per each maker's ISO 281 a_ISO factor): FAG / INA K 81115-TV (thermoplastic cage TV equivalent to SKF TN); NSK K 81115 TN; NTN K 81115 T2 (steel cage T2 alternative in NTN's system); Timken KT115 (Timken's cylindrical-roller-thrust naming convention). For a full complete drop-in bearing (K + WS + GS in one line-item), order 81115 TN (no K prefix). For rebuild-only replacement of the individual washer, order WS 81115 or GS 81115 as needed. Applications for the K roller-and-cage assembly: single-direction axial-load carry between adjacent hardened surfaces in COMPACT axial designs — gearbox thrust take-up between hardened housing bosses, hydraulic-cylinder end stops, screw-jack thrust ends, machine-tool spindle end-thrust bearings at medium bore (75 mm), marine gear thrust bearings where axial section height must be minimised. Explicitly NOT for applications requiring misalignment compensation — the K variant does not provide self-alignment. If the housing bore cannot be machined perpendicular to the shaft axis within 0.001 rad (roughly 0.06 degrees), the correct SKF path is a sphered housing seat + separately-ordered sphered seat washer, NOT a K-prefix 811xx bearing. SKF 811xx K-range at bore 75 mm — this K 81115 TN sits in the light-section 81100 series; a heavier-section alternative at 75 mm bore is the 81215 TN (medium 81200 series) with substantially higher load rating. See our companion 'SKF 81xxx Cylindrical Roller Thrust Bearing Reference' document for the full 81100 / 81200 / 89400 series context. IMPORTANT: that reference document's per-row load-rating table should be treated as approximate — SKF-verified per-product data on the current SKF product page is the authoritative source for a specific engineering RFQ. See internal note on 81xxx doc load-rating verification. cBallast supplies the SKF K 811xx TN cage-and-roller assembly range plus matched WS shaft washers, GS housing washers, and complete 811xx TN bearings ex-EU stock. Request a quote by SKF designation (K 81115 TN vs full 81115 TN vs WS 81115 vs GS 81115), the target installation (compact between-hardened-surfaces vs full drop-in bearing), and interchange preference (SKF vs FAG K81115-TV vs equivalent maker).