Jaw Plates: Component Specs, Materials & Applications

Component Specifications

Definition

Jaw plates are critical wear components installed on the fixed and movable jaws of primary jaw crushers. They form the crushing chamber where raw materials like rocks, ores, and aggregates are fractured through mechanical compression. These plates are designed with corrugated or smooth surfaces to optimize crushing efficiency and particle size reduction. Their geometry, material composition, and tooth profile directly influence crusher capacity, product gradation, and operational costs in mining, quarrying, and aggregate production.

Working Principle

Jaw plates operate on the principle of compressive crushing. The movable jaw plate moves cyclically toward the fixed jaw plate, creating a narrowing gap. Material fed into the chamber is crushed by the mechanical pressure exerted between the two plates. The corrugated or tooth patterns on the plate surfaces enhance grip and fracturing efficiency, breaking larger particles into smaller, uniform sizes through repeated compression cycles.

Materials

High manganese steel (Mn14, Mn18, Mn22), alloy steel with chromium (Cr) and molybdenum (Mo) additives, or composite materials with ceramic inserts for abrasion resistance. Heat treatment processes like quenching and tempering are applied to achieve optimal hardness (200-400 HB) and toughness.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	500-3000 kg	Depends on crusher model and plate dimensions.
Hardness	200-400 HB	After heat treatment; higher hardness improves wear resistance but reduces toughness.ASTM E10
Thickness	50-200 mm	Varies with crusher size and application.
Service Life	1000-5000 hours	Depends on feed material abrasiveness, crusher settings, and plate material.
Tooth Profile	Corrugated, wedge, or smooth	Profile affects crushing efficiency and wear pattern; selection depends on feed size and product requirements.
Material Grade	Mn14, Mn18, Mn22, Cr-Mo alloy steel, or composite with ceramic inserts	High manganese steel grades per ASTM A128; alloy steel with Cr and Mo for enhanced toughness; ceramic inserts for extreme abrasion.ASTM A128
Tensile Strength	500-800 MPa	For high manganese steel after heat treatment; ensures structural integrity under impact.ASTM E8
Impact Toughness	20-50 J/cm²	Charpy V-notch test; higher toughness prevents breakage under impact loading.ASTM E23
Dimensional Tolerance	±1-3 mm	Critical for proper fit in crusher; tighter tolerance for larger plates.ISO 2768-m
Wear Resistance	Relative wear rate 0.5-2.0 vs. standard Mn18	Measured by dry sand/rubber wheel test; lower is better.ASTM G65
Feed material hardness	Up to 450 MPa (compressive strength)	Outside this window: Excessive wear or breakage if harder material is fed.
Feed size	80-1000 mm depending on crusher setting	Outside this window: Oversize feed can cause jamming or plate damage.
Operating temperature	-20 to 200 °C	Outside this window: Below -20°C risks brittle fracture; above 200°C may temper the steel and reduce hardness.
Moisture content of feed	Up to 5% by weight	Outside this window: Higher moisture can cause clogging and increased wear due to sliding.
Crusher setting (closed side setting)	50-300 mm	Outside this window: Too tight causes excessive wear; too wide reduces crushing efficiency.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ASTM A128, ASTM E10, ASTM E8, ASTM E23, ISO 2768-m, ASTM G65

Parent Products

This component is used in the following industrial products

Primary Crusher

The first-stage crushing equipment in a slag processing system that reduces large slag chunks to smaller, manageable sizes.

View Product Details

Engineering Analysis

Risks & Mitigation

Premature wear due to abrasive materials
Fatigue failure from cyclic loading
Improper installation causing misalignment
Material hardening leading to brittle fracture

FMEA Triads

Trigger: Abrasive feed material like granite or basalt
Failure: Excessive wear reducing plate thickness and crushing efficiency
Mitigation: Use high-chromium alloy plates, optimize feed size, and implement regular wear monitoring

Trigger: Overloading or tramp metal in feed
Failure: Cracking or catastrophic plate breakage
Mitigation: Install metal detectors, use overload protection systems, and ensure proper crusher settings

Compliance & Inspection

Tolerance

Dimensional tolerance ±2 mm for plate thickness and bolt hole alignment; surface flatness within 1.5 mm/m

Test Method

Ultrasonic testing for internal defects, hardness testing per ASTM E10, wear resistance testing via ASTM G65 abrasion test

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Jaw Plates

Manufacturer profiles associated with Jaw Plates.

Sourcing Jaw Plates from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Related Components

Mounting Interface

Precision mounting interface connecting punch tips to pharmaceutical tablet press machines for accurate tablet production.

Chrome Plating

Hard chrome plating is an electroplating process that deposits a layer of chromium onto metal surfaces to enhance wear resistance, corrosion protection, and reduce friction for hydraulic cylinder piston rods.

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Frequently Asked Questions

How often should jaw plates be replaced?

Replacement frequency depends on material hardness, crusher settings, and feed material abrasiveness. Typically, plates last from several weeks to months, with monitoring through regular inspections for wear patterns and thickness reduction.

What are the signs of worn jaw plates?

Signs include decreased crushing efficiency, increased power consumption, uneven product size, visible cracks or deformation, and excessive wear on plate teeth or surfaces.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Jaw Plates