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The Timken Company is a global industrial leader with a growing portfolio of engineered bearings and power transmission product brands. With more than a century of knowledge and innovation,we continuo

Inner ringdtΔds, tΔdmp1)2)tVdsptΔBstVBstKiatSd≤ULULmmµmµmµmµmµmµm–180–530–10053818300–630–10053830500–840–12054850800–950–150648801200–1050–2007591201800–1370–25086101802500–1580–300108112503150–1890–3501310133154000–23120

Bore diameterHousingUnit seriesMetricInchSeriesMaterialStandardYET 2standard seals (fig. 1)standard grease (VT307)✔–SY .. M ( fig. 2 )Cast ironISOSY .. FM–✔SY .. U1) (fig. 3)ISO2)–✔SYH .. U1) (fig. 3)SYH .. FM✔–SYF ( fig. 4 )Not standard

Inner ringdtΔdmp1)tΔds2)tVdsptVdmptΔBstVBstKiatSdtSiaAllNormalModified3)≤ULULULLmmµmµmµmµmµmµmµmµmµm2,5100–2,50–2,52,51,50–40–2501,51,51,51,510180–2,50–2,52,51,50–80–2501,51,51,51,518300–2,50–2,52,51,50–120–2501,52,51,52,5305

Inner ringdtΔdstVdsptVdmptΔHstΔH1stKiatSi≤ULULULmmμmμmμmμmμmμmμm50800–953,50–17525–2533801200–10640–17525–25331201500–13850–17530–30331501800–13850–17530–30441802500–15960–20030–30442503150–181180–40040–40663154000–23141

Bore diameterRadial internal clearanceBearings with a cylindrical boreBearings with a tapered boredC1SPC2NormalC3C1SPC2overincl.min.max.min.max.min.max.min.max.min.max.min.max.mmµmµm243051510252045356015252535304051512252550457015252540405051815303

Inner ring, bearing width and ring widthsdtΔdmptVdsptVdmptΔBstKiatΔTstΔT1stΔT2sTolerance classesNormalCL7C1)≤ULULULULULmmμmμmμmμmμmμmμmμm10180–121290–120157+2000+1000+100018300–121290–120188+2000+1000+100030500–121290–1202010+2000

Bore diameterTotal width tolerance ΔTsD of matched bearings in the series329320330331302, 322332303, 323313dΔTsDΔTsDΔTsDΔTsDΔTsDΔTsDΔTsDΔTsD≤ULULULULULULULULmmμm–30––+550+50––––+550+100+550+100+600+100+500+503040+600+150+550+100––

Increasing the preload(back-to-back)Decreasing the preload(back-to-back)Increasing the preload(face-to-face)Decreasing the preload(face-to-face)BorediameterSizeRequisite spacer ring width reduction of bearings in the series719 CD719 ACD70 CD70 ACDdab

Inner ringOuter ringMinimum singlechamferdimensionNominal bearingbore diameterMaximum chamferdimensionsNominal bearingoutside diameterMaximum chamferdimensionsrs mindr1r2Dr3r4≤≤≤mmmmmmmmmm0,61,4–101,6r1 min + 0,5r2 min + 1,3–168,3r3 min + 0,6r4