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Harvester Cutter Bar

Assembled from three parts: the Sickle Knife Section, the Knife Blade, and the Knife Back,
driven by the cutter assembly to complete the cutting of rice, wheat, soybeans, and other crops.
Relying on its own forging plant and precision machining capabilities, Maikeyier has developed
and produced harvester cutter bar assemblies that support three mainstream materials:
65Mn spring steel, 75Cr1 white steel, and SK5 high‑carbon steel.

Request Sample
Quick Guide
65Mn / 75Cr1 / SK5
Extended & Standard
Serrated & Plain
Baked Paint / Oil‑coated
Harvester Header Cutter Bar

Product Details

Cutter Bar Assembly · Knife Section · Blade · Knife Back

Harvester Cutter Bar Assembly

The harvester cutter bar assembly consists of three main parts: the knife section, the blade, and the knife back,
fastened together by rivets or bolts. Together, these three determine cutting efficiency and service life.

Sickle Knife Section Smallest Unit

The knife section is the smallest unit of the cutter bar assembly, formed by combining a blade and a knife back.
Each knife section contains one blade and one corresponding knife back section.

  • Extended: Large‑feed harvesters, high‑yield crops
  • Standard: Conventional operations, cost‑priority

Knife Blade Cutting Element

The blade is the cutting element that directly contacts the crop. Its thickness and tooth design directly affect cutting performance and service life.

  • Thickness: 2.0 / 2.5 / 2.6 / 2.8 mm
  • Tooth type: Serrated / Plain edge

Knife Back Mounting Base

The knife back is the mounting base for the blade. Its thickness determines the overall rigidity and bending strength of the cutter bar assembly.

  • 6 mm: Standard, matches most harvesters
  • 7 mm: Reinforced, high‑load operations

 

Core Specifications

Knife section, blade, and knife back parameters and applications.

Knife Section Specifications

Specification Description Application Scenario
Extended knife section Length increased compared to standard; wider cutting coverage per pass Large-feed harvesters, high-yield crops, scenarios requiring high operational efficiency
Standard knife section (non-extended) Length meets general standards; compatible with most harvesters Conventional harvesting operations, cost-priority bulk procurement

Blade Thickness

Thickness Recommended Application Durability
2.0mm Light harvesting, thin-stalk crops Economical, suitable for light-duty operations
2.5mm Conventional rice/wheat harvesting Standard thickness; most widely used on the market
2.6mm High-yield, densely planted crops Reinforced, better durability
2.8mm Thick-stalk crops, high-yield fields Heavy-duty; longest service life

Tooth Type Selection

Tooth Type Features Application Scenario
Serrated edge Fine teeth on the cutting edge; stronger cutting force, anti-slip Damp lodged crops, fields with tough straw
Plain edge Smooth, straight cutting edge; lower cutting resistance Dry, standing rice/wheat; conventional harvesting

Knife Back Thickness

Thickness Features Application Scenario
6mm Standard thickness; matches original specifications of most harvesters Conventional harvesting operations
7mm Reinforced, thicker; superior rigidity High-load continuous operations, thick-stalk crops, large-feed harvesters

Three Materials · Precision Match

65Mn Spring Steel · 75Cr1 White Steel · SK5 High‑Carbon Steel

65Mn
Spring steel · Chinese standard
52–56 HRC
Excellent elasticity and toughness; impact‑resistant and fatigue‑resistant; most widely used mainstream option.
Most Used
Conventional Fields
75Cr1
White steel · German standard
58–62 HRC
High‑end alloy tool steel; high hardness, excellent wear resistance; longest service life.
Best Wear
Large‑area Harvesting
SK5
High‑carbon steel · Japanese standard
56–60 HRC
Balanced sharpness and durability; preferred for high‑end export markets.
Export
Japan/Korea/Europe
Comparison: Impact toughness 65Mn ★★★★★ > 75Cr1 ★★★★ > SK5 ★★★★ · Wear resistance 75Cr1 ★★★★★ best

Two Blade Types

Extended · Serrated ｜ Standard · Plain

Extended · Serrated

  • Structure: Extended design for wider cutting coverage; serrated edge for stronger cutting force
  • Application: Damp lodged crops, high‑yield densely planted crops, weedy fields
  • Efficiency: Larger coverage per pass, higher efficiency
  • Note: Must confirm header drive system compatibility

Standard · Plain

  • Structure: Standard length; smooth, straight cutting edge
  • Application: Dry standing rice/wheat; conventional harvesting
  • Maintenance: Easy to sharpen manually
  • Compatibility: Compatible with most harvesters, broadest fit

Core selection principle: Damp/lodged crops → Serrated; Dry/standing crops → Plain.
Extended increases efficiency, Standard offers broadest compatibility.

Surface Treatment & Fastening

Choose based on storage environment and maintenance needs.

Surface Treatment

  • Baked paint: Anti‑rust paint applied and cured at high temperature; excellent rust protection, neat appearance, suitable for long‑term storage, sea freight
  • Oil‑coated (natural finish): Anti‑rust oil applied to finished product; low cost, does not affect welding or secondary processing; economical and practical

Coastal humid markets → Baked paint; Inland dry areas → Oil‑coated

Fastening Method

  • Rivet: Permanent connection, high reliability, suitable for OEM, infrequent replacement
  • Bolt: Convenient replacement, ordinary wrench for removal, suitable for repair markets, overseas distributors

Repair markets → Bolt preferred; OEM → Rivet

Quick Selection Guide

Match the best solution based on customer type and working conditions

Comparison Dimension Extended Knife Section Standard Knife Section
Cutting width Wider; larger coverage per pass Standard width
Operational efficiency Higher; larger area per unit time Standard efficiency
Model compatibility Must confirm header drive system compatibility Compatible with most harvesters
Procurement cost Slightly higher Lower
Recommended scenario High-yield crops, large contiguous fields Conventional harvesting, multi-model general stocking

Supplier – Maikeyier

Since 2010, serving agricultural parts aftermarkets in more than 25 countries worldwide.

Factory Strength

Relying on its own forging plant and precision machining capabilities, Maikeyier has developed and produced harvester cutter bar assemblies supporting 65Mn, 75Cr1, and SK5. Products perfectly fit Kubota, Yanmar, World, Lovol, and other mainstream brands.

Service Commitment

Full‑chain services: selection consultation, free samples, compatibility confirmation, customization evaluation, documentation support, market strategy advice. After‑sales: quality traceability, rapid issue resolution, installation guidance, long‑term supply commitment.

Pre‑Sales Services

  • Product selection consultation
  • Free samples of Combine Harvester Parts and tractor parts
  • Compatibility confirmation
  • Customization evaluation
  • Product documentation support
  • Market strategy recommendations

After‑Sales Services

  • Quality issue traceability
  • Rapid quality issue resolution
  • Installation technical guidance
  • After‑sales technical consultation
  • Long‑term supply commitment

Production Process & Quality Control

Full‑chain quality management from raw material to finished product.

Cutter Bar Production Process

1
Raw material inspection

Spectrographic analysis to ensure composition standards

2
Precision stamping

One‑time forming; serrated teeth formed by precision dies

3
Continuous heat treatment

Quenching and tempering for uniform hardness

4
Knife back processing

Drilling, bending, straightening; hole accuracy ±0.2mm

5
Surface treatment

Baked paint or oil‑coated as required

6
Assembly

Rivet/bolt fastening, torque testing

7
Final inspection

Appearance, sharpness, dimensional sampling

8
Shipment

Each batch retains inspection report, traceable

Quality Control Process

Stage Inspection Item Inspection Equipment/Method
Incoming material inspection Material composition analysis Spectrographic analyzer; ensures material meets standards
Cutting inspection Dimensional consistency Precision calipers; batch sampling
Stamping forming Blade dimensions, tooth integrity Gauges + 100% visual inspection
Heat treatment Hardness, toughness Rockwell hardness tester; batch sampling
Knife back processing Length, hole spacing, flatness Coordinate measurement + go/no-go gauges
Assembly fastening Rivet/bolt torque, blade angle Torque wrench + angle gauge
Finished product inspection Sharpness, assembly dimensions, appearance Test cutting + full-size sampling
Shipment sampling Batch consistency verification Each batch retains inspection report

Procurement Recommendations by Market Region

Optimal combination based on regional conditions

Market Region Recommended Material Recommended Blade Type Recommended Surface Treatment
Southeast Asia (hot, rainy) 65Mn / SK5 Serrated offset blade + extended knife section Baked paint
South Asia (distinct dry/wet seasons) 65Mn Standard selection Oil-coated / Baked paint
South America (large-scale farms) 75Cr1 Extended knife section Baked paint
Africa (dry, rocky) 65Mn Plain offset blade Oil-coated
Europe / North America (high-end markets) 75Cr1 / SK5 Based on crop type Baked paint

Pricing Factors

Price determined by material, thickness, length, surface treatment, fastening method, and order quantity.

Material selection

75Cr1 > SK5 > 65Mn

Blade thickness

2.8mm > 2.6mm > 2.5mm > 2.0mm

Surface treatment

Baked paint > Oil‑coated

Knife section

Extended > Standard

Fastening method

Bolt > Rivet

Order quantity

Larger volumes reduce per‑unit cost

Compatible Brands & Models

Perfect fit for Kubota, Yanmar, World, Lovol, and other mainstream brands

Kubota

DC70, DC105, PRO series, AR series, R series, etc.

Yanmar

AW70V, AW82V, AG series, C series, Y series, etc.

FMWorld (World)

RG series, 4LZ series, etc.

Lovol

RG series, 4LZ series, etc.

Other brands: Suitable for most rice, wheat, and soybean combine harvesters

Frequently Asked Questions

How do I know when the Harvester Cutter Bar needs replacement?
Replace the cutter bar when: ① blade edges are worn and blunt, causing difficult cutting and uneven stubble; ② blades are chipped or broken; ③ blade‑to‑knife back connection is loose and cannot be tightened; ④ knife back is bent or deformed and cannot be straightened; ⑤ cutting performance of the entire assembly has noticeably declined. It is generally recommended to inspect the cutter bar before each season and replace it early if wear is significant.
What is the difference between serrated and plain blades? How to choose?
Serrated blades have fine teeth on the cutting edge, providing better anti‑slip and cutting force when harvesting damp lodged crops. Plain blades have a smooth, straight edge with lower cutting resistance, suitable for dry standing crops. Core selection principle: choose serrated for damp/lodged crops; choose plain for dry/standing crops.
What are the characteristics of 65Mn, 75Cr1, and SK5 materials?
65Mn is Chinese standard spring steel with good elasticity, toughness, impact resistance, and the best cost‑performance – suitable for conventional fields. 75Cr1 is German standard alloy tool steel with high hardness and excellent wear resistance – suitable for large‑area continuous harvesting and high‑wear environments. SK5 is Japanese standard high‑carbon steel with excellent edge retention and a good balance of hardness and toughness. High‑end markets and export orders often prefer 75Cr1 or SK5.
What is the difference between extended and standard knife sections?
Extended knife sections provide wider cutting coverage per pass, improving single‑pass efficiency – suitable for high‑yield crops and large contiguous fields. Standard (non‑extended) knife sections offer the broadest compatibility and lower procurement costs – suitable for conventional harvesting and multi‑model general stocking.
Which is better – rivet or bolt fastening?
Bolt fastening is more convenient for later maintenance, allowing end‑users to replace blades themselves – suitable for repair markets and overseas distributors. Rivet fastening has lower cost and more secure one‑time assembly – suitable for OEM matching and scenarios where blades are not frequently replaced. Maikeyier recommends bolt fastening as the priority, as long‑term maintenance costs are lower.
What is the difference between baked paint and oil‑coated finish?
Baked paint has an anti‑rust paint layer providing excellent rust protection – suitable for humid storage environments and long‑distance sea freight exports. Oil‑coated finish only applies anti‑rust oil, preserving the metal’s natural color at a lower cost – suitable for inland dry areas or short‑term use. For humid markets, baked paint is recommended.
Can Maikeyier cutter bars directly replace original cutter bars?
Yes. All specifications and dimensions are matched to original standards – no drilling, no modification, direct installation. Every batch comes with an inspection report, and batches are traceable.
What is the MOQ for cutter bar assemblies? Do you support mixed lots?
The MOQ for conventional specifications is 100 sets per specification. Mixed‑lot orders with different materials, blade types, and specifications are supported. For example: 100 sets of 65Mn serrated 2.5mm + 50 sets of SK5 serrated 2.6mm can be combined into one order. Please contact us for a detailed quotation.
How to choose blade thickness?
2.0mm is suitable for light harvesting and thin‑stalk crops; 2.5mm is the standard general‑use thickness and the most widely used; 2.6mm reinforced is suitable for high‑yield densely planted crops; 2.8mm heavy‑duty is suitable for thick‑stalk crops and high‑load operations. For conventional harvesting, 2.5mm is recommended; for high‑yield fields, choose 2.6mm or 2.8mm.

Need Harvester Cutter Bars?

Whether you need 65Mn standard cutter bars, 75Cr1 high‑end wear‑resistant cutter bars, or SK5 sharp‑edge cutter bars;
whether you face dry standing crops or damp lodged crops; whether you are a repair shop stocking in bulk or exporting full containers –
Maikeyier can provide you with high‑quality, cost‑effective Harvester Cutter Bar solutions.

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