RNA 59 Series Needle Roller, No Inner Ring Bearings

The same 59 dimension series with the inner ring left out: an RNA5900 is 14 mm across the needle complement, 22 mm outside and 16 mm wide, and it runs directly on a hardened and ground 14 mm shaft where its NA5900 partner would have carried a 10 mm bore. Read the code the same way as the rest of this family — it is the complete bearing's bore code, not the shaft. RNA 5905 mounts on a 30 mm shaft, not the 25 mm its code would suggest.

Reading the designation — and the one field that is not about this bearing. RNA5900 is RNA, then 5, then 9, then 00. The 5 is the width series and the 9 the diameter series, both ISO 15's digits, so the outside diameters are the 61900 ladder's and every NA59 row beside this one carries the same D. The 00 is a bore code — and here it names nothing this bearing has. RNA5900 runs on a 14 mm shaft; the 00 that means 10 mm on every other page in this library means nothing at all here. The code is kept because the two halves of one ISO 1206 row have to sort together — RNA5905 and NA5905 are the same row of the same table — not because it measures anything on this bearing. RNA5905 reads 05 and runs on a 30 mm shaft, not the 25 mm the code would suggest; RNA 59/32 reads 32 and runs on a 40 mm one. Every page here prints the shaft diameter beside the code for that reason.

Fw is the number that does name it. Fw is the needle complement diameter, and on a complete bearing it is the inner ring's raceway. With the inner ring gone it is the shaft, so Fw is simultaneously the bore this type does not have and the seat it does. An RNA5900 is 14 mm at Fw, 22 mm outside and 16 mm wide. Its NA5900 partner is 10 mm at d, 14 at Fw, 22 outside and 16 wide. Put the two rows together and the arithmetic of the whole type is visible in one line: the outer ring, the rollers and the cage are identical, the inner ring was 2 mm of wall, and that wall is now shaft — the seat grows from 10 to 14 mm, 2 mm on each side, and nothing else moves. The band the rollers work in, between Fw and D, is 4 mm deep in both.

The width is called C here and B there, and it is the same width. ISO 1206 tabulates one figure per row for the width and names it after the part it measures: B on the complete bearing, where the number is the inner ring's width, and C on the bearing without an inner ring, where it is the outer ring's. The figure does not change — 16 mm on both the NA5900 and the RNA5900 — only the symbol does. This library prints the symbol the plan prints, so the same 16 mm appears as B on one page and C on the other. In this series, as in the 49, the two rings are flush, so reading one as the other is harmless — on a tapered roller it would not be, which is why the symbol is carried through rather than normalised.

One row of ISO 1206, read twice — and the build checks that it is. There are 94 designations of each kind here across the four dimension series, and the RNA rows are derived from the NA rows rather than transcribed a second time, so the two can only disagree if the derivation itself is wrong. It is checked at build time anyway: an assertion compares Fw, D, the width and the chamfer minimum cell by cell across all 94 rows, and fails if a hand-written RNA table ever replaces the derivation with figures that differ in one cell. So "the same row" is not a claim this page makes — it is a property the build enforces.

Why no clearance table is printed. The same reason the complete NA bearings give: ISO 5753-1 does tabulate a radial clearance for needle roller bearings, and these sizes fall inside it, so the figure exists — but the catalogue reproductions of that table disagree in every clearance group, so none can be confirmed as the standard's own. Under this library's rule that a published figure needs two independent sources agreeing, the table is left out and the ISO 5753-1 page shows both readings instead.

What is beside it. The complete bearings these rows belong to are tabulated with the inner ring in place, as the NA 59 series — the same table read the other way. The other two readings of this envelope are the RNA 49 series, 3 mm narrower, and the RNA 69 series, 6 mm wider. The 48 series is not one of these: it is the same plan on diameter series 8, opening at a 110 mm bore, and is tabulated as the RNA 48 series. What is not in this series is the drawn cup needle roller bearing, which belongs to ISO 3245 rather than ISO 1206.

Every designation in the table below links to its own page with the ISO 1206 boundary dimensions, the bore-code arithmetic, the needle complement diameter and the shaft the bearing runs on.

This series runs from a 14 mm to a 160 mm shaft. The sub-library as a whole reaches 300 mm of bore, and the widest single bearing in it is a 6360, 620 mm across, in the 6300 series. It shares its outside-diameter ladder with the complete bearings of the same dimension series.

Fw = needle complement diameter, D = outside diameter, C = width. All of them are ISO 1206 standard values and are the same for every manufacturer. r s min is the minimum single chamfer dimension the plan gives; its matching maximum is in ISO 582, which is why the column says “min” and not an equality. The last column is derived: radial section = (D − Fw) / 2, the wall thickness you are working with when you size the housing. No load rating and no limiting speed appears here — see the bearings index for why.

Outside diameter × overall size in millimetres, for the 5 smallest bores in this database. The full charts, one per type, are on the bearings index. Reading a row is what a machine designer does when the shaft is already fixed: the bore does not change, the housing bore does. Across the type boundary the last number changes meaning — it is a width above and a height below — so compare within a type, then decide whether the job wants a ball bearing, a tapered roller or a thrust bearing at all. The 4 series whose type has no bore are not rows here: they are indexed by the shaft they run on, and their chart is above.