Disc Plough Size Chart: How Many Discs for Your Tractor?

How many discs can your tractor pull? Which disc diameter should you choose? This disc plough size chart answers both questions using the SH steel plate disc plough range – from a light 3-disc plough for an 18 hp compact tractor to a 6-disc plough for tractors of 120 hp and more. Use it to shortlist the right model before you ask for a quotation.

Disc Plough Size Chart

Model	Discs	Disc diameter	Working width	Working depth	Weight	Tractor power
1SH-315	3	460 mm	0.6 m	180 mm	170 kg	18–25 hp
1SH-220	2	510 mm	0.4 m	200 mm	160 kg	25–30 hp
1SH-320	3	510 mm	0.6 m	200 mm	190 kg	25–40 hp
1SH-420	4	510 mm	0.8 m	200 mm	250 kg	50 hp
1SH-230	2	710 mm	0.6 m	300 mm	400 kg	35–55 hp
1SH-325	3	660 mm	0.75 m	250–300 mm	420 kg	50–70 hp
1SH-330	3	710 mm	0.9 m	300 mm	530 kg	55–70 hp
1SH-425	4	660 mm	1.0 m	250–300 mm	480 kg	80 hp
1SH-430	4	710 mm	1.2 m	300 mm	580 kg	70–90 hp
1SH-525	5	660 mm	1.25 m	250–300 mm	580 kg	≥100 hp
1SH-625	6	660 mm	1.5 m	250–300 mm	700 kg	≥120 hp

The SH FAZA-type ploughs follow the same size steps. All are three-point mounted.

How to Read the Model Number

In the model name, the first figure is the number of discs and the last two figures indicate the disc size: “15” for 460 mm, “20” for 510 mm, “25” for 660 mm and “30” for 710 mm. So a 1SH-425 has four 660 mm discs, and a 1SH-330 has three 710 mm discs.

Choosing by Tractor Power

• 18–40 hp compact tractors: 2- or 3-disc ploughs with 460–510 mm discs (1SH-315, 1SH-220, 1SH-320). Light, easy to lift, ploughing 180–200 mm deep.
• 35–70 hp tractors: 2- or 3-disc ploughs with 660–710 mm discs (1SH-230, 1SH-325, 1SH-330) for deeper ploughing of 250–300 mm.
• 70–90 hp tractors: 4-disc models (1SH-425, 1SH-430).
• 100 hp and above: 5- and 6-disc models (1SH-525, 1SH-625).

On heavy clay, dry hardpan or new land, choose one size smaller than the table suggests. Our tractor horsepower guide explains why soil type changes the power you need.

Smaller Discs or Larger Discs?

Larger discs (660–710 mm) reach deeper, roll over stones and roots more easily and keep cutting in trashy ground. They also make the plough heavier, so the tractor needs more lift capacity.

Smaller discs (460–510 mm) keep the plough light for small tractors and are ideal for shallower ploughing in gardens, orchards and small fields.

Common Sizing Mistakes

• Buying by engine power only: a tractor may have enough horsepower but too little lift capacity for a heavy plough with large discs.
• Ignoring soil type: the same tractor that pulls four discs in sandy loam may only manage three in wet clay.
• Too narrow for the tractor: if the plough is narrower than the rear tyre track, the wheel runs on unploughed soil and compacts it.
• Forgetting ballast: a long mounted plough lifts the front wheels; add front weights so the tractor steers safely.

Before You Order: Checklist

1. Tractor engine power and rear lift capacity.
2. Hitch category of your three-point linkage.
3. Soil type: sandy, loam, clay, stony or new land.
4. Ploughing depth you need.
5. Rear tyre track width – the plough should cover the wheel marks.

Choosing the right implement size is central to the FAO’s guidance on sustainable agricultural mechanization. Once your plough is chosen, read how to adjust a disc plough and our plough disc blades guide.

FAQ

How many discs can a 50 hp tractor pull?

Typically 3 discs of 660 mm (1SH-325) or 4 discs of 510 mm (1SH-420).

What disc size do I need for deep ploughing?

Choose 660 or 710 mm discs, which plough 250–300 mm deep.

Is a FAZA-type plough different in size?

The SH FAZA-type ploughs come in the same disc numbers, disc sizes and power ranges as the steel plate ploughs.

Get a Quote

Send us your tractor HP, soil type and destination port. See every model on our ploughs page.