INARNAO45X62X40Needle Roller Bearing – 45 mm Bore, 62 mm OD, 40 mm Width, Double Row, Ribless, No Inner Ring

Product Description

What this part is

INA RNAO45X62X40 machined needle roller bearing, double row, without an inner ring. The outer ring, two needle roller rows and their cages form one assembly, and the rollers bear directly on the shaft. Bore Diameter: 45 mm (roller bore, Fw). Outside Diameter: 62 mm. Overall Width: 40 mm. Dynamic Load Rating: 76,000 N. Static Load Rating: 135,000 N. Limiting Speed: 10,000 rpm. Reference Speed: 5,900 rpm. Rolling Elements: Needle Roller. Number Of Rows: 2. Bore Type: Straight. Closure Type: Open. Item Weight: 0.377 kg (0.83 lb). Series: RNAO. Base Number: RNAO45X62X40.

Decoding the designation

RNA — machined needle roller bearing supplied as an outer ring and needle roller assembly, running on the shaft.

O — ribless outer ring. Axial guidance of the roller set comes from washers rather than from integral ribs, which is what allows the full 40 mm of roller length in a 62 mm outside diameter.

45X62X40 — roller bore, outside diameter and width in millimetres, quoted directly rather than through a series code.

ZW — double row. Two needle rows are what carry the 76,000 N dynamic rating in an 8.5 mm radial wall.

ASR1 — the axial guidance washer arrangement for the ribless execution.

XL — Schaeffler’s current-generation designation.

What these specs mean in practice

A 135,000 N static rating out of a 45 x 62 mm envelope is the highest radial capacity available in that space short of a full-complement roller set. The ribless design and the second row are both spent on load rating; axial location has to come from elsewhere in the assembly.

Reference Speed: 5,900 rpm is the thermally referenced figure. Limiting Speed: 10,000 rpm is the mechanical ceiling. Fatigue load limit: 21,900 N.

Operating temperature range: −30 °C to 120 °C.

Mounting data

Shaft raceway: ground and hardened to 670 HV or better, finished to bearing inner-ring tolerance. Raceway diameter, outer ring: 53 mm. Shoulder diameter, outer ring: 53.5 mm. Shoulder diameter for axial guidance against the housing: 45.6 mm; against the shaft: 52.2 mm. Maximum recess radius: 0.3 mm. Minimum chamfer dimension: 0.3 mm.

Quantity and configuration

Unit Quantity: 1 Pc. Single bearing assembly, straight bore, open, double row.

Interchange guidance

RNAO ribless needle roller bearings are dimensioned to their own Schaeffler scheme rather than to an ISO series number, so the cross-maker interchange that exists for RNA49 and RNA69 numbers does not apply here. Designation variants: RNAO 45X62X40, RNAO-45X62X40, RNAO45X62X40-ZW-ASR1-XL, RNAO45X62X40ZW.