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If you're staring at a drawing, or holding a bearing in your hand trying to figure out "is this single row or double row, and can I swap it for the other one" — this article is written for exactly that. No filler, just the numbers, a part-number cross-reference table, and the honest answer on interchangeability.
A single row deep groove ball bearing is the familiar "6-series" you've probably ordered before — 6200, 6300, and similar. One row of balls, one raceway, simple construction, high speed, low cost. A double row deep groove ball bearing packs two rows of balls side by side inside one shared inner and outer ring (usually a "4-series" part number, like 4200 or 4300). In essence, it's trading axial width for radial load capacity — for the same bore size, a double row bearing can carry roughly 50%–80% more radial load than its single row counterpart, at the cost of a wider bearing and a somewhat lower speed limit.
A lot of people search this exact question because both bearings share the same family name — "deep groove ball bearing" — so why do the cross-sections look so different? The answer is in how the balls are arranged.
One row of balls, one raceway — symmetrical and low rotational resistance
Two rows of balls side by side, sharing one inner/outer ring — overall wider
The diagram makes it clear: a double row bearing isn't simply two single row bearings welded together (that's actually a different setup called a "matched/duplex pair"). It's designed as one integrated unit from the ground up — both ball rows share the same outer ring structure, just machined with two raceways instead of one. This is also why a double row deep groove ball bearing can't be split apart into two single row bearings — it was never two separate parts to begin with.
Structure alone isn't enough for a real selection decision — what matters most is the numbers. Here's a side-by-side comparison of the specs that come up most often in bearing selection. Feel free to check your own part number against it.
| Comparison Point | Single Row | Double Row |
|---|---|---|
| Radial load capacity | Baseline (100%) | ~150%–180% (not a simple 2x) |
| Axial load capacity | Weaker — light, single-direction only | Stronger — can handle some bidirectional axial load |
| Limiting speed | High — suited to high-speed duty | ~20%–35% lower than an equivalent single row |
| Axial width | Narrow — saves installation space | Noticeably wider, roughly 1.6–2x a single row |
| Heat & friction | Low | Higher — lubrication and cooling matter more at speed |
| Price (same bore size) | Lower | ~40%–100% higher, depending on brand and size |
| Typical part prefix | 60, 62, 63 series | 42, 43 series |
This is the most practical section. Many people search "6205 vs 4205 difference" or "can I replace a 6305 with a 4305" — what they really want is to see the dimensions for the single row and double row version of the same bore size, side by side. Here are a few of the most common sizes:
| Bore | Single Row Part No. | OD × Width / Cr (kN) | Double Row Part No. | OD × Width / Cr (kN) |
|---|---|---|---|---|
| 20mm | 6204 | 47×14 / ~12.7 | 4204 | 47×18 / ~17.8 |
| 25mm | 6205 | 52×15 / ~14.0 | 4205 | 52×18 / ~19.5 |
| 30mm | 6206 | 62×16 / ~19.5 | 4206 | 62×20 / ~27.0 |
| 35mm | 6207 | 72×17 / ~25.5 | 4207 | 72×23 / ~35.8 |
| 40mm | 6208 | 80×18 / ~29.5 | 4208 | 80×23 / ~40.5 |
You don't need to memorize every spec — just walk through these questions:
This question actually splits into two separate cases — let's cover both clearly:
No. As covered in the structure section above, a double row deep groove ball bearing has an integrated inner and outer ring design — there's no way to physically separate it into two independent single row bearings.
In theory, a similar effect can be partially achieved this way (this practice is known as a "matched pair" mounting, and it does exist in engineering practice), but a few things matter: tighter installation tolerances are required, you'll typically need extra spacer sleeves or locating features, and the overall axial dimension and weight will change. The load-carrying calculation also isn't identical to a true one-piece double row bearing. If the original design specifically calls for a double row deep groove ball bearing, it's best to source the correct replacement part rather than improvising with a "stacked" single row substitute — especially in applications carrying axial load, where the risk is bigger than it looks.
Because double row deep groove ball bearings use more material and require more complex machining (both raceways need tight precision), they typically cost 40% to nearly 100% more than a single row bearing of the same size, depending on brand and precision grade.
Before ordering, check these details to avoid buying the wrong part:
A double row deep groove ball bearing has symmetrical deep-groove raceways and is primarily designed for radial load, with limited axial capacity. An angular contact ball bearing has a raceway machined at a contact angle, purpose-built to handle significant single- or double-direction axial load — its axial capacity is noticeably higher, though radial capacity and speed characteristics differ. If axial load is the dominant condition in your application, angular contact ball bearings are usually the more specialized choice.
As a general guideline, axial load on a double row deep groove ball bearing should stay within a certain proportion of its radial rating (check the manufacturer's catalog for the specific axial load factor). It can take load in both directions, but it isn't designed for heavy axial duty — if axial load is significant, an angular contact ball bearing or tapered roller bearing is a better fit.
You can use a "matched pair" mounting, but it isn't fully equivalent to a one-piece double row deep groove ball bearing — you'll need to account for spacer sleeves, positioning accuracy, and a different overall axial dimension. The load capacity calculation method also differs, so this substitution isn't recommended in critical load-bearing positions.
In common bearing numbering systems, a "4" prefix typically denotes a double row deep groove ball bearing series, with the following digits indicating the dimension series and bore code — for example, 4205 is a double row deep groove ball bearing with a 25mm bore. Numbering conventions can vary slightly between standards (GB/T, ISO, and individual manufacturers), so always confirm against the specific brand's designation.
For the same size, a double row bearing's limiting speed is typically about 20%–35% lower than an equivalent single row bearing. This is because the double row structure has more friction surfaces and generates more heat, so adequate lubrication and cooling matter more at higher speeds.
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