Jaw Plates for Primary and Secondary Jaw Crushers
Jaw plates are the primary wear interface in a jaw crusher. Their material composition, casting integrity, heat treatment consistency, and dimensional accuracy directly determine crusher productivity, product gradation, and total cost per tonne processed. Mine Components manufactures jaw plates in manganese steel grades Mn13, Mn14, and Mn18, as well as alloyed variants, with full batch traceability and documentation for each production run.
We supply jaw plates as standard catalogue-compatible items and as custom components produced to client drawings, covering both fixed jaw and swing jaw positions across a wide range of crusher models and frame sizes.
Applications
Our jaw plates are used in primary and secondary jaw crushers across mining, quarrying, aggregate production, cement manufacturing, and recycling operations. Typical feed materials include granite, basalt, limestone, sandstone, iron ore, copper ore, and demolition concrete. We supply plates for single-toggle and double-toggle crusher configurations, covering feed openings from 400 mm up to 1,500 mm width and individual plate weights from under 50 kg to over 2,000 kg per piece.
Material Grades and Selection
The correct manganese steel grade for a jaw plate depends on the crusher type, feed material hardness and abrasivity, and the loading intensity at the crushing chamber. The following grades are available:
| Grade | Typical Composition | Best Application |
|---|---|---|
| Mn13 (ZGMn13) | C 1.0–1.35%, Mn 11–14% | Medium-impact, cost-sensitive secondary crushing |
| Mn14 (ZGMn14) | C 1.0–1.3%, Mn 13–16% | Standard primary crushing, hard rock, granite, basalt |
| Mn18 (ZGMn18) | C 1.1–1.4%, Mn 17–19% | High-energy primary crushing, large plates, low-temperature environments |
| Mn14+Cr / Mn14+Mo | Mn14 base with 1.5–3% Cr or 0.5–1.5% Mo | High-abrasivity feeds; improved through-thickness consistency in thick plates |
If you are unsure which grade is correct for your application, our engineering team can advise based on your crusher model, feed material, and current wear part service history. For a detailed explanation of how manganese grades respond to impact and abrasion, see our technical article on manganese grade selection.
Profile Options and Customization
Jaw plate profile geometry determines how feed material is gripped, fractured, and discharged. We produce the following standard profiles:
Corrugated (ripple) profile — the most widely used profile for primary crushing of hard rock. The tooth geometry provides positive material grip and efficient size reduction across a broad feed size range. Profile pitch and tooth height are matched to the crusher’s designed closed-side setting (CSS) range.
Flat profile — used in secondary and tertiary positions where feed material is pre-crushed and dimensional tolerance on the product is the primary concern. Flat plates wear more uniformly and are suitable for sticky or wet materials that would pack in a corrugated profile.
Stepped and chambered profiles — for specific crusher models that require a defined reduction ratio at each chamber zone. Produced to OEM drawings or client-supplied geometry.
Beyond profile geometry, we support full custom modifications including: bolt hole patterns and positions, plate thickness adjustments for specific CSS settings, wear-indicator grooves at defined depth intervals, asymmetric profiles for crushers with unequal fixed-to-swing contact geometry, and two-piece split plate designs for large crushers where single-piece handling exceeds crane capacity or site constraints.
Manufacturing Process
Each jaw plate production run follows a structured sequence of controlled manufacturing stages, all documented at the batch level.
Material Engineering and Melt Control
Grade is confirmed against the application specification before melting. Chemical composition is verified by spectrographic analysis prior to pouring. Heat chemistry is adjusted at the melt stage to ensure the final casting meets the specified alloy range. We do not rely on post-cast chemistry correction. For details on our material engineering approach, see the engineering section.
Casting
Jaw plates are produced by sand casting or resin sand casting depending on geometry and dimensional tolerance requirements. Pattern tooling is produced in-house for custom orders, ensuring dimensional control is established at the tooling stage rather than addressed through post-cast machining allowances.
Solution Heat Treatment
All manganese steel jaw plates undergo solution annealing at 1,050–1,100°C followed by water quenching. This dissolves carbide precipitates that form during solidification and produces a fully austenitic microstructure with the toughness and work-hardening capacity required in service. Heat treatment parameters—furnace temperature curves, soak duration, and quench records—are documented per batch. See our heat treatment process documentation for further detail.
Machining and Dimensional Verification
Mounting surfaces, bolt hole positions, and critical mating interfaces are finish-machined after heat treatment to ensure dimensional accuracy is not compromised by any distortion introduced during quenching. Critical dimensions are inspected against drawing tolerances using calibrated instruments, and results are recorded in the inspection report accompanying each delivery.
Quality Assurance and Documentation
Each jaw plate delivery is supported by a documentation package that includes: chemical composition report per heat, hardness test results (surface and where applicable cross-section), dimensional inspection records against drawing, heat treatment time-temperature curves and quench records, and packing list with part identification traceability to the production batch.
Non-destructive testing (magnetic particle inspection or ultrasonic testing) is available on request and can be specified as a standard requirement for high-value or safety-critical orders. Third-party inspection through SGS, Bureau Veritas, or the client’s nominated inspector can be accommodated at the pre-shipment stage.
For a full overview of our quality system, see the Quality Assurance section.
Compatibility and Crusher Model Coverage
We maintain reference data for jaw plate geometry across major jaw crusher brands and can produce compatible plates on the basis of OEM part numbers, crusher model and serial number, or client-supplied drawings. We are able to manufacture to drawings provided under NDA — all client technical documentation is handled under confidentiality agreement as standard.
For obsolete crusher models where OEM supply has been discontinued, we can reverse-engineer plate geometry from worn originals provided by the client, subject to dimensional condition of the reference part.
Ordering and Lead Times
Standard manganese jaw plates for common crusher models are available with lead times of 3–5 weeks from drawing confirmation. Custom-profile plates or large plates above 1,000 kg typically require 5–8 weeks depending on heat treatment scheduling and inspection requirements. We can provide indicative lead times at the inquiry stage once crusher model and plate specification are confirmed.
To place an inquiry, submit your crusher model, jaw plate drawing or part number, required quantity, and any material or documentation requirements using the form below, or contact our engineering team directly.
Request a Quote for Jaw Plates →
Related Products
Clients sourcing jaw plates also commonly require: Crusher Hammers, Impact Plates, and Secondary Crusher Wear Parts. We can supply complete wear part sets for a crushing circuit from a single source, simplifying procurement and documentation management.