SKFDeep 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. This is the bulk lot: ten pieces from one production batch.

Designation breakdown

6: bearing type, single-row deep groove ball bearing. 1: width series 1. SKF prints this digit and 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, where 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) and from 04 upward the code is multiplied by 5. No closure suffix: open both sides. SKF prints 2Z for shields and 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.

Cross-section check

Extra-thin-section bearings have a square cross-section, where the radial wall, (outside diameter − bore) ÷ 2, equals the width. Here (22 − 10) ÷ 2 = 6 mm, which is the stated 6 mm width. The dimensions match SKF’s published data.

Specifications 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. The thin raceway walls make it more sensitive to mounting than a standard-section bearing, since an out-of-round housing bore, an oversized shaft or excessive interference distorts the rings, and that distortion appears as runout and noise.

Open construction gives the lowest friction torque available, with no rubbing lip and no grease churn, which suits an encoder shaft, a low-drag idler or an oil-mist-lubricated spindle. The bearing carries no protection and holds no lubricant of its own. The shielded 61900-2Z and sealed 61900-2RS1 are separate parts with different friction and permissible speed.

Normal CN clearance suits ordinary fits and modest temperature differences between the rings. With too little residual clearance once the interference fit and thermal growth are accounted for, the balls run preloaded, friction rises, the bearing heats and the clearance closes further. With too much clearance, the radial load is carried by fewer balls, contact stress rises, the bearing runs noisily and the balls can skid rather than roll. A thin section gives a narrower window than a 6000 or 6200.

Published ratings and mounting data

Figures 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 Pu: 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 approximately 13.9 mm. D2 approximately 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. The two speed figures are SKF’s published values for the shielded 61900-2Z. An open bearing has less drag than a shielded one, so 36 000 r/min is a conservative floor. Every other figure is envelope data that closure does not change.

Set composition

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 runs across the whole lot. One purchase of this listing is ten bearings.

The same SKF 61900 from the same batch is stocked as a four-piece lot under SKU AA1B2#PURRGD.

Mounting data

Mounting force is applied only to the ring being fitted, the inner ring for a shaft fit and the outer ring for a housing fit, and not through the balls. Abutment dimensions are shaft shoulder da min. 12 mm and da max. 12.9 mm, housing shoulder Da max. 20 mm, and fillet ra max. 0.3 mm. Chamfer r1,2 min. is 0.3 mm. At a 10 mm bore these rings are thin enough that a hammer blow permanently distorts them. The bearings ship with preservative oil only and take light oil, oil mist, or a small charge of a suitable grease according to speed and duty.

Cross-references

The 10 × 22 × 6 mm open size is standardised in ISO 15 and made by every major maker, so cross-references follow 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. 6900ZZ, 6900-2RS, 61900-2Z and 61900-2RS1 are the same size but shielded or sealed rather than open.