NTNNU3309BX1CS65Single Row Cylindrical Roller Bearing, Straight Bore, 45 x 100 x 39.7 mm, Non-Locating, Wide Series

Product Description

What this part is

An NTN NU3309BX1CS65 single-row cylindrical roller bearing, 45 mm bore, 100 mm outside diameter, 39.7 mm width. Straight bore, open, steel cage, normal precision class.

Decoding the designation

NU is the non-locating cylindrical roller design, with guide ribs on the outer ring and a plain cylindrical inner ring. 33 is the dimension series, the widest of the single-row cylindrical roller sections, and the bore code 09 gives 45 mm. The remaining characters are NTN factory suffixes carried on the carton and are held as cross-references.

What these specs mean in practice

An NU bearing carries radial load only and lets the shaft move axially inside the housing, which is what a floating bearing position needs. The wide 33 section holds a longer roller than a 02 or 22 series bearing of the same bore, so radial capacity rises for the same shaft diameter, at the cost of a longer housing seat. Line contact between roller and raceway gives several times the radial rating of a ball bearing in the same envelope.

Quantity and configuration

1 Pc. Complete bearing: ribbed outer ring, roller and cage assembly, plain inner ring. Open both faces, without snap ring.

Fitting notes

The plain inner ring separates from the outer ring and can be heated and fitted to the shaft independently. Axial location of the shaft comes from the second bearing in the arrangement.

Interchange guidance

SKF NU 3309 ECP and FAG NU3309-E-TVP2 are same-envelope equivalents in the reinforced design. NTN NJ3309 is a related size with one inner-ring rib that locates the shaft in one direction; NTN NF3309 is a related size with ribs on the inner ring plus one outer rib, also locating in one direction.