Bosch sells two separate ranges of power tools in the UK: the blue “Professional” line built for trade use and the green “DIY” line built for the home market. The two lines share branding, retailer shelves and even occasional model numbers, but they share very little in the way of internals. A spare part for a green planer will not fit a blue planer, and vice versa.
Blue tools are heavier, run longer-life motors and are intended for daily on-site use. The brushes are typically larger, the bearings heavier and the drive belts thicker. Green tools are lighter, quieter and aimed at occasional DIY use. The motors are smaller and the brushes wear faster in continuous use, which is why we see plenty of green-line brushes coming through.
For brushes specifically, the line is the first thing to confirm before ordering. The full Bosch carbon brushes range covers both lines, but the part code and dimensions are different between equivalent models — a blue GSH 11 E hammer is not the same brush as a green PBH 2100 RE. The brush code on the original, if visible, is the single best reference. Model number from the rating plate is the second.
The most-shipped Bosch spares are PHO-series planer drive belts — the green PHO 15-82 and PHO 2000 belts wear out predictably and benefit from a fresh fit — see planer drive belts. Brushes for the blue GWS angle grinders and the green PWS grinders are the next most common, with bearings on the higher-use SDS hammers following close behind. Replacement bearings are standard sealed types specified by inner, outer and width.
For accessories, blades and discs across both lines, the wider Bosch collection is the catch-all. If you're working on a tired Bosch tool and not sure where to start, the tool parts hub sorts spares by part type.