Volvo B12M/(620)
Built: 2005-2007 · Series: B12M
More machines from model year 2005
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Volvo B12M – mid-engined bus chassis: 12-litre six-cylinder engine rated at 250 to 309 kW, 12.0 to 13.5 metres long, 19 tonnes gross vehicle weight
The B12M is not a lorry in the strict sense but a Volvo bus chassis with a twelve-litre six-cylinder engine mounted centrally, supplied to coachbuilders for touring and line-service buses; Volvo's B denotes a bus chassis, the twelve the engine displacement in litres, and M the mid-mounted engine position. The models B12M, B12M 4X2, B12M 4X2 9700S, B12M 9700S and B12M/(620) show different body variants, including the well-known 9700S coach body.
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The register lists 5 versions with 250 to 309 kW from six-cylinder engines of 12,100 to 12,300 cm³, kerb weights of 13,000 to 16,435 kg, a gross vehicle weight of 19,000 kg, lengths of 12,000 to 13,500 mm and widths of 2,510 to 2,550 mm.
As a chassis for coachbuilders, the B12M formed the technical basis of numerous European coaches for many years, competing with comparable chassis from Mercedes-Benz, MAN and Scania, before Volvo increasingly offered complete buses of its own manufacture. The mid-mounted engine allowed a lower floor and more luggage space than chassis with a rear-mounted unit.
When buying such a chassis, the condition of the mid-mounted engine and its cooling, wear on the clutch and automatic gearbox, and corrosion on the load-bearing frame under the bus body deserve checking; engine and chassis parts are supplied through the Volvo commercial-vehicle network.
Sources: SpecCodex register, model data: Volvo B12M, Volvo Trucks (manufacturer)
Technical data
Engine
| Power | 250 kWcorrect |
|---|---|
| Displacement | 12,130 cm³correct |
Dimensions and weights
| Length | 12,000 mmcorrect |
|---|---|
| Width | 2,550 mmcorrect |
| Unladen weight | 13,000 kgcorrect |
| Gross vehicle weight | 19,000 kgcorrect |
Where this model stands
Power-to-weight ratio: 19.2 kW/t (250 kW / 13 t)
Stronger than 40% of the trucks in the register — out of 25,242 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Volvo B12M/(620) have?
The Volvo B12M/(620) delivers 250 kW.
How much does the Volvo B12M/(620) weigh?
The unladen weight is 13,000 kg.
What is the gross vehicle weight of the Volvo B12M/(620)?
19,000 kg.
What engine does the Volvo B12M/(620) have?
12,130 cm³ displacement.
What are the dimensions of the Volvo B12M/(620)?
12,000 mm × 2,550 mm.
When was the Volvo B12M/(620) built?
Production years: 2005-2007.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 7 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
The technical data on this page comes from official vehicle registration records (RDW/Traficom), not from the manufacturer.
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Other models in this series
Sources: Traficom — Finnish vehicle register (retrieved August 2026) · How we check the data
Truck in 3D section
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