SKF61900Deep Groove Ball Bearing, Open, Extra-Thin Section, 10 x 22 x 6 mm — Bulk Lot of 10 Pieces, 2.7 kN Dynamic, Square Cross-Section

Product Description

What this part is

Ten open single-row deep groove ball bearings in the metric 619 extra-thin-section series, each 10 mm bore × 22 mm outside diameter × 6 mm width. Open means no seal and no shield on either side and no grease charge — the rings carry SKF’s preservative oil only, so the lubricant is your choice. This is the bulk lot: ten pieces from one production batch, priced below the per-piece rate of the four-piece lot, aimed at anyone building or maintaining more than a couple of machines at a time.

Decoding the designation

6 — bearing type, single-row deep groove ball bearing.
1 — width series 1. SKF prints this digit; most other manufacturers omit it, which is why the same bearing appears elsewhere as 6900.
9 — diameter series 9, the extra-thin section.
00 — bore size code. Code 00 means 10 mm (the codes 00 to 03 are special cases: 00 = 10 mm, 01 = 12 mm, 02 = 15 mm, 03 = 17 mm; from 04 upward, multiply the code by 5).
No closure suffix — open both sides. SKF prints 2Z for shields, 2RS1 for contact seals.
No cage suffix — standard pressed steel cage.
No clearance suffix — normal radial internal clearance, CN.
No grease suffix — consistent with an open bearing, which carries no grease fill at all.

Correcting the source data

The original listing carried no manufacturer field, no barcode and a one-line spec stub, and its title said only “10 Pcs” against an internal stock count of 13 — a combination that could reasonably be read as either ten bearings or thirteen. We photographed the stock, counted the sachets, and have rewritten the listing so the sale unit is unambiguous: one purchase of this listing is ten bearings. The barcode 7316577121882 and the Japanese country of origin were both read off the sachet print and added to the record.

Confirming the dimensions without a datasheet

Extra-thin-section bearings have a square cross-section: the radial wall, (outside diameter − bore) ÷ 2, equals the width. Here (22 − 10) ÷ 2 = 6 mm, which is exactly the stated 6 mm width. The dimensions on this listing are internally consistent and match SKF’s published data, so there is no size ambiguity to resolve.

What these specs mean in practice

A thin section trades capacity for space. At 2.7 kN dynamic and 1.27 kN static, the 61900 is a locating and guiding bearing for light, fast, precise rotation, not a load-carrying member. The thin raceway walls also make it more sensitive to mounting than a standard-section bearing: an out-of-round housing bore, an oversized shaft, or too much interference distorts the rings, and that distortion shows up in your machine as runout and noise. The seat tolerances matter more here than the bearing does.

Choosing open over shielded or sealed is a real engineering decision. Open gives the lowest friction torque available — no rubbing lip, no grease churn — which is what an encoder shaft, a low-drag idler or an oil-mist-lubricated spindle needs. The cost is that the bearing has no protection and holds no lubricant of its own. In a dusty or wet location an open bearing will not last; specify 61900-2Z (shields) or 61900-2RS1 (contact seals) for that duty. Those are different parts, not equivalents, and swapping them in changes both the friction and the permissible speed.

Normal CN clearance suits ordinary fits and modest temperature differences between the rings. Mismatched clearance fails in both directions, which is why it is worth thinking about rather than defaulting. Too little residual clearance once the interference fit and thermal growth are accounted for, and the balls run preloaded: friction rises, the bearing heats, the clearance closes further, and life collapses in a self-reinforcing loop. Too much clearance, and the radial load is carried by fewer balls, so contact stress rises, the bearing runs noisily, and the balls can skid rather than roll, scuffing the raceways. A thin section gives you a narrower window than a 6000 or 6200, so use the abutment figures below rather than guessing.

Published ratings and mounting data

All figures below are SKF’s own published data for the 61900 envelope, per bearing.

Bore d — 10 mm; outside diameter D — 22 mm; width B — 6 mm
Basic dynamic load rating C — 2.7 kN
Basic static load rating C₀ — 1.27 kN
Fatigue load limit Pₐ — 0.054 kN
Calculation factor kᵣ — 0.02; calculation factor f₀ — 14
Mass — 0.01 kg per bearing (about 0.1 kg for the lot of ten)
d₁ ≈ 13.9 mm; D₂ ≈ 19.4 mm
Chamfer r₁,₂ min. — 0.3 mm
Abutment dimensions — shaft shoulder dₐ min. 12 mm, dₐ max. 12.9 mm; housing shoulder Dₐ max. 20 mm; fillet rₐ max. 0.3 mm
Reference speed — 70 000 r/min; limiting speed — 36 000 r/min

A deliberate caveat on those two speed figures: they are SKF’s published values for the shielded 61900-2Z, because SKF’s datasheet for the open bearing does not publish them separately in the source we used. An open bearing has less drag than a shielded one, so its permissible speed is at least these numbers — read 36 000 r/min as a conservative floor, not a ceiling. Every other figure in the list is envelope data that closure does not change.

Quantity and configuration — read this before you order:
This listing is one bulk lot of ten bearings. Photographs confirm ten individually sealed SKF sachets, each barcoded 7316577121882 and printed 61900, 51-MADE IN JAPAN, batch 336L — one batch across the whole lot, which is what you want if the ten are going into identical assemblies. Buy this listing once and ten bearings arrive; you do not need to set the quantity to ten.

Need fewer? The same SKF 61900 from the same batch is stocked as a four-piece lot under SKU AA1B2#PURRGD. Need a large volume? Contact us before ordering so we can confirm the count we can ship in one consignment.

Fitting notes

Apply mounting force only to the ring being fitted — inner ring for a shaft fit, outer ring for a housing fit — and never through the balls. At a 10 mm bore, use a proper mounting sleeve or a small arbor press; these rings are thin enough that one careless hammer blow permanently distorts them and the bearing never runs true again. Because they ship with preservative oil only, lubricate before running: light oil, oil mist, or a small charge of a suitable grease according to speed and duty. Do not wash the preservative off and then run dry. Leave each sachet sealed until the moment of fitting so the remaining pieces stay protected.

Interchange guidance

The 10 × 22 × 6 mm open envelope is standardised in ISO 15, so it interchanges dimensionally across every major maker. Open bearings carry no closure suffix, so cross-referencing is just a matter of each brand’s series convention: SKF 61900, FAG 61900, INA 61900, NSK 6900, NTN 6900, Koyo 6900, NACHI 6900, EZO 6900, and the trade descriptions 6900 open and 10x22x6. The trap is closure rather than size: 6900ZZ, 6900-2RS, 61900-2Z and 61900-2RS1 all share this envelope but are shielded or sealed, and they are not the same part as an open bearing. If you came here for low friction or because you lubricate externally, only the open version will do.