RNA 69 Series Needle Roller, No Inner Ring Bearings

The widest no-inner-ring needle series here, and the same envelope as its NA partner: an RNA6900 is 14 mm across the needle complement, 22 mm outside and 22 mm wide, running directly on a hardened and ground 14 mm shaft. Where the NA6900 is a 10 mm bore complete bearing, the RNA6900 has no bore at all — the needle complement diameter is the shaft it needs. The series stops at RNA6919, matching the NA69 range, and carries the same three slash codes.

Reading the designation — and the one field that is not about this bearing. RNA6900 is RNA, then 6, then 9, then 00. The 6 is the width series and the 9 the diameter series, both ISO 15's digits, so a RNA69 row and its NA69 partner carry the same outside diameter. The 00 is a bore code, and here it names nothing this bearing has: RNA6900 runs on a 14 mm shaft, and the 00 that means 10 mm everywhere else in this library means nothing at all on this page. The code is kept because the two halves of one ISO 1206 row have to sort together, not because it measures anything on this bearing. RNA6905 reads 05 and runs on a 30 mm shaft, not the 25 mm the code would suggest.

Fw is the number that does name it. With the inner ring gone, the needle complement diameter is the shaft: Fw is simultaneously the bore this type does not have and the seat it does. An RNA6900 is 14 mm at Fw, 22 mm outside and 22 mm wide; its NA6900 partner is 10 mm at d, 14 at Fw, 22 outside and 22 wide. 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 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 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 — 22 mm on both the NA6900 and the RNA6900 — only the symbol does, and this library prints the symbol the plan prints. As in the other series of this family the two rings are flush, so reading one symbol as the other is harmless here.

One row of ISO 1206, read twice — and the build checks that it is. 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 every derived row, 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 this series stops at a 110 mm shaft. The RNA 49 and RNA 59 ladders both run to a 160 mm shaft; this one ends at RNA6919, whose seat is 110 mm. That is the same place its complete partner stops, for the same reason: the published range for the 69 series ends at a 95 mm bore, and the no-inner-ring reading cannot go further than the table it is read from.

Why no clearance table is printed. ISO 5753-1 does give needle roller bearings a radial clearance table and these sizes fall inside it, so the figure exists — but the catalogue reproductions of it disagree in every clearance group, so none can be confirmed as the standard's own. The table is left out under this library's two-source rule, 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 69 series — the same table read the other way. The other two readings of this envelope are the RNA 49 series and the RNA 59 series, 9 mm and 6 mm narrower on the first seat. The 48 series is the same plan on diameter series 8 rather than 9 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 110 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.