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Jaw Plate Selection Guide: Types, Materials, Wear Life & Cost Optimization

Jan 30, 2026

Introduction: Why Jaw Plate Selection Matters for Jaw Crushers

In mining, construction crushing, and related industries, jaw crushers are indispensable core equipment, and jaw plates – as wear parts that directly contact materials – directly determine crushing efficiency, equipment loss, and overall costs. Many enterprises have encountered such dilemmas: after choosing the wrong jaw plates, crushing throughput plummets, frequent replacements increase maintenance costs, and even core components of the crusher are damaged due to excessive wear of jaw plates, leading to serious production downtime.

This article provides a systematic selection plan from basic cognition, type classification, key selection factors, and service life extension techniques, helping you accurately match your material characteristics, equipment parameters, and output requirements. By following this guide, you can extend the service life of jaw plates by more than 30%, increase crushing efficiency by 20%, and truly achieve cost reduction and efficiency improvement.

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What Are Jaw Plates and How Do They Work?

Definition and Structure of Jaw Plates

Jaw plates are key components of jaw crushers that directly contact crushed materials, featuring a rectangular structure specifically designed to fit the crusher’s crushing chamber. They come in pairs – divided into fixed jaw plates and movable jaw plates: the fixed jaw plate is mounted on the frame as the “reference surface” for crushing, while the movable jaw plate is connected to the eccentric shaft and performs reciprocating motion to complete the crushing action.

In addition to the crushing function, jaw plates also act as “guardians” – they isolate the direct impact and wear of materials on internal core components of the crusher (such as eccentric shafts and bearings), avoiding costly equipment maintenance.

Jaw Crusher Working Principle

The working mechanism of jaw plates is not complicated: the motor drives the eccentric shaft to rotate, and through transmission components such as connecting rods and toggle plates, the movable jaw plate is driven to reciprocate along a preset trajectory. When the movable jaw plate approaches the fixed jaw plate, a compressive force is formed between the two plates to crush the materials in the crushing chamber; when the movable jaw plate moves away, the crushed materials are discharged from the discharge port under the action of gravity, completing a crushing cycle.

In simple terms, jaw plates serve two core purposes: first, reducing the particle size of materials through compression; second, providing protection for precision internal components of the crusher to avoid wear and damage.

Jaw Plate Types and Applications

Different material characteristics and crushing requirements call for different types of jaw plates. Blindly choosing universal jaw plates will only lead to accelerated wear and low efficiency. Below are the most common types of jaw plates on the market and their applicable scenarios to help you quickly find the right match:

Common Jaw Plate Types Explained

Jaw Plate Type	Core Features	Applicable Scenarios/Materials	Common Materials
Standard/Straight Plate	Flat and smooth surface, simple structure	General-purpose crushing, suitable for low-hardness, uniform non-abrasive materials (e.g., limestone, coal, asphalt)	Manganese Steel
Corrugated Plate	Wavy surface for strong material grip	Abrasive, slippery, irregular materials (e.g., hard ore, construction waste fragments)	Manganese Steel
Toothed Plate	Equipped with tooth-like or ridge-like protrusions on the surface, strong biting force	Hard, brittle materials (e.g., granite, concrete blocks, scrap steel), especially suitable for demolition and recycling, mining scenarios	Chrome Iron Alloy, Special Alloy
Slab Breaker Jaw Plate	Equipped with impact surfaces at both top and bottom, concentrated crushing force	Large slab-like materials (e.g., basalt slabs, large ore blocks), capable of crushing materials through bidirectional compression from top and bottom	High-Carbon Manganese Steel
Cheek & Grid Plates	Cheek plates: support the movable jaw; Grid plates: designed with sieve holes	Cheek plates: protect both sides of the crusher, avoid material leakage and impact; Grid plates: control the particle size of finished products, suitable for the final stage of crushing	Manganese Steel
Wedge/Quarry-Specific Jaw Plate	Special angle design, concentrated mass	Rough, irregularly shaped rocks (e.g., raw rocks in quarries), with strong impact resistance	Manganese Steel, TIC (Titanium Carbide) Composite Material

Quick Jaw Plate Selection Chart

Daily general crushing (limestone, coal) → Standard/Straight Plate
Demolition and recycling, concrete crushing → Toothed Plate
Mining hard rock (granite, iron ore) → Corrugated Plate/Wedge Plate
Crushing of large slab-like materials → Slab Breaker Jaw Plate
Need to control the particle size of finished products → Grid Plate
Prevent equipment side leakage and wear → Cheek Plate

Key Factors for Jaw Plate Selection (Avoid Costly Mistakes)

The core of choosing the right jaw plates lies in balancing the four dimensions of “material characteristics, equipment parameters, jaw plate materials, and operation and maintenance requirements”. Neglecting any dimension will lead to wrong choices.

1. Material Hardness and Abrasiveness

Materials are the primary basis for choosing jaw plates, among which hardness and abrasiveness are the most critical indicators:

Soft materials (Mohs hardness < 5, e.g., coal, limestone): Choose standard jaw plates made of manganese steel (Mn14Cr2, Mn18Cr2), with a service life of 3-6 months; if ultra-high manganese steel or alloy composite jaw plates are adopted, the service life can be extended to 6-12 months.
Medium-hard materials (Mohs hardness 5-7, e.g., iron ore, sandstone): Prioritize alloy composite jaw plates or toothed jaw plates, with a service life of 3-6 months; ordinary manganese steel jaw plates can only be used for 1-3 months.
High-hard materials (Mohs hardness > 7, e.g., granite, quartzite): Must select cemented carbide jaw plates, TIC composite jaw plates, or wear-resistant overlay welding jaw plates, with a service life of 1-3 months; ordinary manganese steel jaw plates can only be used for 15-45 days, which is completely uneconomical.

In addition, attention should also be paid to the humidity, mud content, and foreign matter of materials: materials with high humidity and high mud content are prone to adhering to the surface of jaw plates, so jaw plates with smooth surfaces or large corrugated spacing should be selected; if metal foreign matter may be mixed in the materials, screening equipment should be installed in advance to avoid jaw plate fracture caused by foreign matter impact.

2. Jaw Crusher Specifications and Feed Size

The selection of jaw plates must be fully compatible with the specifications and parameters of the crusher, otherwise, the service life will be significantly shortened:

Equipment specifications: Jaw plates of large jaw crushers bear more uniform forces, and their service life is 20%-30% longer than that of small crushers. Therefore, large equipment can choose manganese steel jaw plates with balanced toughness and hardness, while small equipment can select alloy jaw plates according to material hardness.
Feed port size: The feed particle size must be controlled within 85% of the design upper limit of the equipment. If the feed size is too large, the jaw plates will bear impact loads exceeding the design range, resulting in accelerated wear by 30%-50% and even jaw plate deformation.
Jaw plate installation type: Crushers are divided into one-piece jaw plates and split jaw plates (two-piece type). The replacement methods and adapted materials of the two are different, and the corresponding jaw plate type should be selected according to the equipment manual.

3. Jaw Plate Materials Comparison

Currently, the core materials of jaw plates on the market are mainly manganese steel series and composite materials. Different materials have significant performance differences, and the selection should be based on material hardness and impact strength:

Manganese Steel Jaw Plates

Mn14Cr2: Relatively soft but with extremely high toughness, suitable for low-abrasive materials (e.g., asphalt, soft rock), cost-effective.
Mn18Cr2: Industry-standard material, balancing toughness and wear resistance, suitable for most general scenarios (e.g., concrete, ordinary aggregates), and is the most widely used jaw plate material.
Mn22Cr2: High hardness and fast work hardening speed, suitable for high-impact, high-hardness scenarios (e.g., mining hard rock crushing), with a service life 40% longer than that of Mn18Cr2.

Composite & Special Jaw Plates

TIC (Titanium Carbide) Insert Jaw Plates: Embed TIC hard particles in the manganese steel matrix, with wear resistance 1.5 times that of ordinary manganese steel, suitable for extreme abrasion and impact scenarios (e.g., quartzite, blast furnace slag crushing).
Ceramic Insert Jaw Plates: The most wear-resistant, specifically designed for high-abrasive materials (e.g., glass, quartz sand), but with poor toughness, so excessive particle impact should be avoided.
Chrome Iron Alloy: Mainly used for toothed jaw plates, with strong biting force, suitable for crushing hard and brittle materials (e.g., scrap steel, concrete blocks).

4. Fixed Jaw Plate vs Movable Jaw Plate

Many enterprises ignore the force differences between fixed jaw plates and movable jaw plates and choose the same material, leading to premature wear of one of them:

Movable Jaw Plates: Directly bear the impact load of materials and are subject to uneven forces during movement. Therefore, toughness should be prioritized, and materials such as Mn18Cr2 or Mn14Cr2 can be selected to avoid fracture.
Fixed Jaw Plates: Supported by the frame, subject to relatively stable forces, and mainly bear compressive wear. Therefore, hardness can be prioritized, and materials such as Mn22Cr2 or alloy composite materials can be selected to extend wear-resistant life.

Attention should be paid during assembly: the tooth peaks of the movable jaw plate must be aligned with the tooth grooves of the fixed jaw plate to ensure that the two are in a fully meshed state, avoiding material slipping and local excessive wear of the jaw plates.

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How to Extend Jaw Plate Wear Life (Proven Methods)

Choosing the right jaw plates is only the first step. Scientific installation, operation and maintenance, and repair can extend the service life of jaw plates by another 20%-40%, further reducing costs.

Installation Best Practices

Secure Fastening: Newly installed jaw plates must be firmly fixed on the movable jaw and fixed jaw to ensure flat contact with the machine body surface. If there are gaps, plastic materials such as lead plates, plywood, or cement mortar can be placed between the jaw plates and the machine body to prevent jaw plate sliding, wear, or fracture during operation.
Accurate Meshing: Adjust the jaw plate gap strictly according to equipment requirements to ensure accurate correspondence between the tooth peaks and tooth grooves of the movable and fixed jaw plates, avoiding uneven force.

Daily Operation and Maintenance

Control Feeding: Strictly control the feed particle size and prohibit exceeding the design upper limit of the equipment; at the same time, conduct random inspections on each batch of materials to promptly remove metal foreign objects and oversized materials.
Regular Maintenance: Clean the adhered materials on the jaw plate surface weekly, and adjust the discharge port gap once a month to avoid secondary impact of materials on the jaw plates due to excessive gaps.
Regular Turning: For one-piece jaw plates, when the tooth profile is worn by 30%, the first turning can be performed; when the bottom tooth profile is completely worn, the second turning can be performed to fully utilize the wear-resistant area of the jaw plates.

Jaw Plate Turning and Repair

For worn and invalid jaw plates, there is no need to discard them directly; they can be repaired through overlay welding technology:

Use arc welding or automatic submerged arc welding to overlay a wear-resistant alloy layer on the worn parts of the jaw plates to restore the tooth profile and wear resistance. The service life of the repaired jaw plates can reach 70%-80% of that of new plates, and the cost is only 30% of that of new plates.
Note: If the jaw plate has cracks or the thickness wear exceeds 50% of the design thickness, it must be replaced directly to avoid fracture during use after repair.

Minor Improvements: Enhance Jaw Plate Stability

The huge impact force during the operation of jaw plates will cause the fixing bolts to vibrate and loosen, accelerating wear. Spring washers can be installed on the fixing bolts to enhance the anti-loosening and shock absorption capacity, reduce the displacement and wear of jaw plates, and improve the operational stability of the crusher.

Signs That Jaw Plates Need Replacement

Timely replacing excessively worn jaw plates can avoid equipment damage and production accidents. When the following situations occur, the machine must be shut down immediately for inspection and replacement:

Significant decrease in throughput: Under the same working conditions, the crushing throughput is reduced by more than 15% compared with the normal state, indicating that the tooth profile of the jaw plates is severely worn, and the material gripping and crushing capacity is reduced.
Irregular particle size of finished products: The discharged materials have inconsistent particle sizes and messy shapes, mostly “flaky” or “needle-like”, which is caused by uneven meshing gaps of jaw plates or worn tooth profiles.
Abnormal equipment vibration and noise: The crusher vibrates violently during operation or makes a “clicking” metal impact sound, which may be due to loose jaw plates, cracks, or complete wear of the tooth profile.
Obvious visual wear: Deep grooves, cracks, or exposure of the bottom base metal appear on the surface of the jaw plates, indicating that the wear limit has been exceeded. Continuing to use will cause the jaw plates to fracture.

Kind Reminder: Replacement must strictly follow the manufacturer’s wear limit standards, and do not use them beyond the service life to save costs.

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How to Replace Jaw Plates Safely

Different types of jaw plates have different replacement methods, which must be operated in strict accordance with the following procedures:

One-Piece Jaw Plates

After installing new jaw plates, when the tooth profile is worn by 30%, shut down the machine and turn the jaw plates (left-right or up-down turning) to continue working with the unworn tooth profile.
When the bottom tooth profile is completely worn, perform the second turning until the entire tooth profile is worn out.
After two turnings, if the crushing efficiency still cannot meet the requirements, replace with new jaw plates directly.

Two-Piece Jaw Plates

First, remove the worn jaw plates from the bottom of the crushing chamber.
Remove the work-hardened upper jaw plates and install them at the bottom of the crushing chamber (the upper jaw plates are less worn due to smaller forces and can be reused).
Install new jaw plates at the upper part of the crushing chamber to ensure accurate meshing between the upper and lower jaw plates.

Note: During replacement, the power must be cut off and the machine must be shut down, and safety protection measures must be taken; after installation, a test run of 5-10 minutes should be carried out to check whether the jaw plates are loose and whether the equipment operates smoothly.

How to Choose a Reliable Jaw Plate Supplier

Choosing the right supplier can ensure the quality of jaw plates and subsequent services. The following 4 points should be focused on when selecting:

Professional Qualifications: Prioritize suppliers specializing in wear parts of mining machinery, which must have production qualifications, material inspection reports, and product quality commitment letters.
Customization Capabilities: Whether they can customize exclusive jaw plates (such as special tooth profiles, composite materials) according to your crusher model and material characteristics.
Quality Assurance: Whether they provide service life guarantees; if the actual service life does not meet the promised standards, whether they support returns, exchanges, or compensation.
After-Sales Service: Whether they provide installation guidance, wear diagnosis, and maintenance technical support to solve problems encountered in subsequent use.

FAQ: Jaw Plate Selection & Replacement

How long do jaw plates last?
Jaw plate wear life ranges from 15 days to 12 months, depending on material hardness, abrasiveness, jaw plate material, and operating conditions.

What is the difference between fixed and movable jaw plates?
Movable jaw plates bear higher impact loads and require toughness, while fixed jaw plates experience stable compression and can prioritize hardness.

Which jaw plates are best for granite?
For granite, TIC insert jaw plates or Mn22Cr2 high-manganese steel jaw plates are recommended.

When should jaw plates be replaced?
Jaw plates should be replaced when cracks appear, throughput drops significantly, or wear exceeds manufacturer limits.

Conclusion: The Right Jaw Plates Make Crushing More Profitable

The selection of jaw plates is not “the more expensive, the better”, but “the more suitable, the better”. By analyzing material characteristics, matching equipment parameters, selecting appropriate materials, and doing a good job in daily operation and maintenance, the service life of jaw plates can be extended by more than 30%, crushing efficiency can be increased by 20%, and overall maintenance costs can be reduced by 40%.

If you are still unsure how to choose, or need personalized recommendations based on your own working conditions, please feel free to contact our professional technical team – we will provide you with free material testing, jaw plate selection plans, as well as full-process installation and maintenance guidance, making your crushing operations more efficient, worry-free, and profitable!

📩 Need help selecting jaw plates for your crusher model and material? Contact our technical team for professional recommendations and customized solutions.