Bolinder Munktell BM-21
Built: 1951–1952 · Series: Other models
More machines from model year 1951
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
Bolinder-Munktell – other models: collective page of Swedish tractors outside the named ranges, from the Victor and Buster to the Boxer, Terrier and Bison, 16.9 to 51.5 kW, Bolinders and Volvo engines
This page gathers the Bolinder-Munktell tractors the register could not assign to a named range, with the animal-named ranges Victor, Buster, Boxer, Terrier and Bison. Munktells of Eskilstuna built the first tractor made in Sweden in 1913 and merged in 1932 with the engine maker J & C.O. Bolinder to form Bolinder-Munktell; in 1950 the company became part of the Volvo group and traded from then on as Volvo BM. The BM numbers such as the BM-15 or BM-24 denote early internal types, while the later T numbers such as the T 650 or T 800 refer to the post-war models.
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The register lists here 36 versions with 16.9 to 51.5 kW from two- to six-cylinder engines of 1,414 to 5,312 cm³, unladen weights of 1,225 to 3,405 kg, lengths of 2,550 to 3,570 mm, widths of 1,600 to 1,900 mm and heights of 1,400 to 2,500 mm; torque ranges from 97 to 304 Nm. Engines came from Bolinders, Volvo and Perkins; besides diesel, petrol and, for wartime reasons, wood gas are also recorded as fuel.
Until its merger with Volvo, Bolinder-Munktell was one of the most significant Swedish tractor makers, and its rugged designs laid the technical foundation for the later Volvo BM and Valmet-Valtra tractor line.
When buying one of these decades-old machines used, rust on the frame and mudguards, the condition of the cooling system and head gasket, and on the petrol and wood-gas models the ignition system all matter. Parts can be found through Swedish and Scandinavian vintage-vehicle specialists and partly through later Volvo BM stock.
Sources: SpecCodex register, model data: Bolinder-Munktell (weitere Modelle)
Technical data
Engine
| Fuel | Dieselölcorrect |
|---|---|
| Power | 43 hp (31.6 kW)correct |
| Rated speed | 1,050 rpmcorrect |
| Cylinders | 2correct |
| Displacement | 5,312 cm³correct |
| Bore | 150.1 mmcorrect |
| Stroke | 150.1 mmcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 3,250 mmcorrect |
|---|---|
| Width | 1,820 mmcorrect |
| Height | 1,849 mmcorrect |
| Wheelbase | 2,055 mmcorrect |
| Unladen weight | 2,674 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 5 V/1 Rcorrect |
| Forward gears | 5correct |
| Reverse gears | 1correct |
| Front tyres | 7.50-18 ASFcorrect |
| Rear tyres | 13-30 AScorrect |
| Top speed | 20 km/hcorrect |
Working data
| Fuel tank capacity | 75 lcorrect |
|---|
Origin and approval
| Construction | unit construction (no separate frame)correct |
|---|---|
| Units built | 1,013correct |
Where this model stands
Power-to-weight ratio: 11.8 kW/t (32 kW / 2.7 t)
Power class: Universal (40–100 hp)
Stronger than 28% of the tractors in the register — out of 15,663 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Bolinder Munktell BM-21 have?
The Bolinder Munktell BM-21 delivers 43 hp.
How much does the Bolinder Munktell BM-21 weigh?
The unladen weight is 2,674 kg.
What engine does the Bolinder Munktell BM-21 have?
2 cylinders, 5,312 cm³ displacement, Dieselöl.
How fast does the Bolinder Munktell BM-21 go?
Top speed is 20 km/h.
What are the dimensions of the Bolinder Munktell BM-21?
3,250 mm × 1,820 mm × 1,849 mm.
When was the Bolinder Munktell BM-21 built?
Production years: 1951–1952.
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.
- Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- 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.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
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This page carries 25 individual figures for this model. They come from 2 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
230 VICTOR
320 BUSTER
350 BOXER
400 BUSTER
425 TERRIER
470 BISON
BM - 400 BUSTER
BM 320 D Buster
BM 350 Boxer
BM 425 Terrier
BM-10
BM-15 TERRIER
Sources: Wikibooks Traktorenlexikon (CC BY-SA 4.0) (retrieved August 2026) · Values adopted and presented in our own form; changes from the source are possible. · How we check the data
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.
