Harrow Discs Wholesale Guide: Which 12–36 Inch Discos de Rastra to Stock

Buying harrow discs wholesale is different from replacing a few blades on one farm. A dealer or importer must decide which sizes to stock, which steel to offer and how to ship mixed sizes without wasting money on freight. This guide is written for parts dealers in Latin America and other export markets who sell discos de rastra to farmers and contractors.

What Dealers Should Know Before Buying Harrow Discs Wholesale

Discs are the main wearing part of every disc harrow, disc plough and ridger. Farmers replace them every season or two, so a well-chosen stock of blades brings repeat orders long after the machine is sold. Our harrow discs range covers:

• Diameters from 12 to 36 inches (about 305–915 mm).
• Thickness from 3 to 12 mm.
• 65Mn spring steel or 30MnB5 boron steel, heat-treated to HRC 38–44.
• Plain or notched edge, square or round centre hole, and production to drawing.

If you need the full size chart with every weight, read our harrow disc blade sizes guide. This article focuses on how to build a stock list and order efficiently.

Which Sizes to Stock: A Starter List by Machine

The best-selling sizes follow the harrows already working in your market. As a general guide from our factory data:

Machine type	Tractor power	Typical disc	Edge
Light mounted harrow	12–55 hp	16″–20″, 3–4 mm	Plain or notched
Medium mounted harrow	25–80 hp	20″–24″, 4–5 mm	Notched front, plain rear
Heavy offset harrow	80–140 hp	26″ (660 mm), 6–8 mm	Mostly notched front gang
Folding and extra-large harrow	105–300 hp	26″–36″, 6–12 mm	Notched and plain
Disc plough	18–120 hp	24″–30″	Plain, deeper concavity

In regions with large soybean, corn and sugarcane farms, heavy harrows are common, so the 26″ × 6 mm and 26″ × 8 mm notched blade (the classic disco de rastra recortado for heavy harrows) is usually the core item. Add 22″–24″ blades for medium harrows and a smaller range for light harrows and ridgers.

Steel Grade: 65Mn or 30MnB5 Boron Steel?

65Mn is a proven, economical spring steel. It suits light and medium harrows and general farm work, and it is the right choice for price-sensitive customers.

30MnB5 boron steel hardens more deeply and evenly, so the blade keeps its strength through the full thickness. It resists wear and impact better in sandy, abrasive or stony soil and on heavy harrows working long hours. Many dealers offer both grades: 65Mn as the standard line and boron steel as the premium line.

Weights, Packing and Freight Planning

Blade weight decides how many pieces fit within your container weight limit. Some examples from our weight table (plain / notched, per blade):

Size	Plain (kg)	Notched (kg)
20″ (510 mm) × 4 mm	6.87	6.47
22″ (560 mm) × 5 mm	10.15	9.65
24″ (610 mm) × 6 mm	14.67	14.02
26″ (660 mm) × 6 mm	17.6	16.9
26″ (660 mm) × 8 mm	23.4	22.6
28″ (710 mm) × 8 mm	27.73	26.83

For example, 100 notched 26″ × 6 mm blades weigh about 1,690 kg. Blades are oiled or painted against rust, stacked and wrapped, then packed on pallets or in wooden cases. You can mix many sizes in one order and add complete harrows or ploughs to the same shipment. See our export and shipping page for sea, rail and air options.

Quality Checks Before Shipment

• Hardness: we check hardness on every batch against the HRC 38–44 range.
• Centre hole: confirm square or round, and the size across the flats.
• Concavity: important for plough blades and special machines; send the dish depth.
• Edge: notches should be clean and even so the blade runs smoothly.
• Marking: SH marking or your own OEM brand can be applied.

We also supply matching bearing assemblies, grease or oil-bath lubricated, so you can sell a complete gang repair kit.

Common Mistakes When Importing Disc Blades

• Ordering by diameter only and forgetting thickness or centre hole size.
• Measuring a worn blade from the middle of the gang instead of an unworn end blade.
• Stocking only one steel grade when customers work very different soils.
• Forgetting bearings and spools, which wear at the same time as the discs.

Resumen en español: discos de rastra al por mayor

Fabricamos discos de rastra lisos y recortados de 12 a 36 pulgadas, de 3 a 12 mm de espesor, en acero 65Mn o acero al boro 30MnB5, con dureza HRC 38–44. El disco de rastra recortado de 26 pulgadas (660 mm) y 6–8 mm es el más usado en rastras pesadas para soja, maíz y caña de azúcar. Podemos combinar varias medidas en un solo pedido, marcar los discos con su marca y enviar por barco a puertos de América Latina.

Para cotizar discos para rastra pesada o discos de rastra en general, envíe la medida, el espesor, el tipo de agujero central, el tipo de borde, la cantidad y el puerto de destino por WhatsApp. Más información sobre la mecanización agrícola sostenible en la FAO.

FAQ

Can I order harrow discs wholesale in mixed sizes?

Yes. Several diameters, thicknesses and steel grades can be combined in one shipment.

¿Fabrican discos para rastra pesada de 26 pulgadas?

Sí. Los discos de 660 mm (26″) de 6 a 8 mm, lisos o recortados, son una de nuestras medidas principales.

Are you a harrow disc supplier or a trader?

We are the manufacturer. Discs are made, heat-treated and packed in our own factory in China.

Can you put my brand on the discs?

Yes. SH marking or OEM marking is available.

Get a Quote

Send the size (diameter × thickness), steel grade, edge type, centre hole, quantity and destination port on WhatsApp +86 133 8469 2372, or see the full table on our harrow discs page.