crusher plate
Jiangxi Duma Machinery Manufacturing Co., Ltd. is one of the most credible manufacturers and suppliers of crusher plate in China. Welcome to buy discount crusher plate in stock here and get quotation from our factory. We also accept customized orders.
Product Introduction
Crusher plate is the primary wear component inside a jaw crusher, forming the two faces of the crushing chamber where raw material is broken down under compressive force. In primary crushing operations - handling feed sizes that can exceed 1,000 mm - the fixed jaw plate and swing jaw plate absorb continuous impact and abrasion simultaneously, making material quality and manufacturing precision the two factors that determine how long a set of plates lasts before scheduled replacement.
Advantages
Wear life driven by process control, not just alloy grade
Computer-controlled staged heating + low-temp water quenching ensures a fully austenitic structure for maximum work-hardening. Delivered at HB200, work-hardens to HB500+. Each batch is verified to ASTM A128 / GB/T 13932 to prevent early brittle failure.
Precision fit for crusher frames
Machined to OEM-equivalent tolerances for major crusher brands to ensure perfect seating, preventing movement, uneven wear, and unplanned downtime. All plates undergo PT + UT inspection before shipment to eliminate cracks and internal defects.
Factory-direct supply with full traceability
All processes in-house: casting, heat treatment, machining, and NDT. No intermediaries. Each shipment includes full documentation: material report, heat treatment curve, hardness record, and inspection results for supply chain compliance.
Full engineering support
Engineering team supports selection, tooth profile matching, and post-installation wear analysis. Guidance includes inversion strategy and replacement optimization to extend service life and reduce incorrect specification risk.
Material Options
Selecting the correct alloy grade is the first decision in any plate replacement. The table below covers Duma's standard lineup and the conditions each grade is designed for.
| Grade | Mn Content | Best For | Typical Work-Hardening |
|---|---|---|---|
| Mn14 (ZGMn13) | ~13–14% | Soft to medium rock; recycled concrete and asphalt; low-impact feeds where cost control matters | Surface HB200 to HB400+ |
| Mn18 | ~18% | General mining and quarrying: granite, basalt, river gravel, limestone with medium abrasiveness | Surface HB200 to HB450+ |
| Mn22 | ~22% | Hard rock and high-impact conditions: iron ore, quartz, diabase; large feed sizes in primary crushing | Surface HB200 to HB500+ |
| High Chrome Iron (Cr26+) | N/A | Extremely abrasive, low-impact feeds where abrasion dominates over impact; silica sand, dry limestone | High initial hardness, limited work-hardening |
| TIC Insert Composite | Mn18 base + TiC | Maximum service life in the most abrasive conditions; copper ore, gold ore, highly siliceous rock | Exceptional wear resistance at contact surface |
Not sure which grade fits your ore? Send us your rock type and crusher model and our engineers will recommend the optimal alloy at no charge.
Installation & Maintenance Notes
Alloy grade handles the wear resistance side of the equation. Tooth profile controls how material grips, moves, and fractures through the chamber. An unsuitable profile shortens plate life even when the steel grade is correct, and it affects throughput consistency and product size distribution.
Each Crushing Jaw Liner profile behaves differently against the swing plate during the crushing stroke. Profiles with deeper tooth slots hold material more aggressively, which improves reduction ratio but increases stress concentration at the tooth root. Shallower or corrugated profiles distribute force more evenly and suit a wider range of feed materials.
| Profile | Structure | Best Application |
|---|---|---|
| Standard / Straight Tooth | Uniform tooth pitch, moderate depth | General-purpose primary crushing; limestone, river gravel, mixed feed |
| Corrugated (Chevron) | Alternating high-low tooth pattern | Hard rock prone to slipping; granite, basalt, iron ore; improves grip and reduces material bypass |
| Super Grip | Wider tooth spacing, reinforced flanks | Medium-hard rock requiring balanced grip and wear distribution across both plates |
| Quarry-Specific (Deep Tooth) | Deep tooth slots, thickened swing plate | Highly abrasive hard rock in quarry primary stages; extends replacement intervals |
| Anti-Binding (Asymmetric High Tooth) | Asymmetric fixed-plate tooth height | Wet or clay-contaminated feed prone to packing; clears the lower crushing zone between strokes |
Custom profiles are available on request based on drawings or worn sample measurement. Contact Duma's engineering team with your ore type, feed size, and crusher model for a profile recommendation.
Quality Inspection
These practices consistently extend plate replacement intervals and are worth passing to site maintenance teams:
Initial bolt re-torque
High manganese steel seats gradually under the first hours of impact load. Inspect and re-torque all jaw wedges and fixing bolts within 48 hours of starting a new set of plates. Fasteners that were correctly torqued at installation will have loosened.
Even feed distribution
Off-center or channeled feed concentrates wear on one side of the chamber. Central, full-width feed distribution is the single most effective maintenance practice for extending plate life.
Inversion strategy
At around 50% wear of the lower fixed jaw tooth height, the plate can be flipped and reinstalled to redistribute wear, extending service life by 30–50%. Applicable to most Metso C-series and Sandvik CJ-series crushers.
Replacement timing
Replace when tooth wear reaches ~80% of original height or when throughput and product size consistency decline. Delaying replacement risks frame contact and costly structural damage.
For a detailed breakdown of how wear develops across the fixed and swing plates - and the maintenance protocols that address each wear zone - see: How to Extend Jaw Crusher Plate Lifespan: A Technical Guide to Material Selection and Maintenance
About Duma Machinery
Jiangxi Duma Machinery Manufacturing Co., Ltd. was established in 2010 and operates a 47,000 m² in-house foundry in Yushan County, Jiangxi Province. The facility covers the full production process - raw material inspection, melting, casting, staged heat treatment, precision machining, and multi-stage NDT - with no outsourced steps and no trading company involvement. Annual output capacity exceeds 10,000 tonnes. Certified to ISO 9001:2015.
Duma's crusher wear parts are in active use at mining and quarrying operations in the US, Canada, Australia, South Africa, Mexico, Chile, and Southeast Asia. Standard models from existing patterns ship in 7–10 days. Custom and non-standard castings typically complete within 35–45 days.
47,000 m²
Total facility area
4,000+
Casting patterns in stock
10,000 t/yr
Annual output capacity
ISO 9001
| Quality management cert. |
fAQ
Can Duma produce plates from a worn sample?
Yes. Send the worn plate or accurate dimensional measurements and Duma's engineering team will develop a new casting pattern. Most reverse-engineered patterns are ready within the standard 35–45 day production lead time.
Do you supply both fixed and swing plates, or individual pieces?
Both. Duma supplies complete matched sets (fixed and swing) as well as individual plates. Jaw wedges, cheek plates, fixing bolts, and nuts are also available as part of a one-stop rebuild kit.
Can I flip the jaw plates to extend service life?
Yes, on most crusher frames. When lower-section wear on the fixed plate reaches approximately 50% of original tooth height, the plate can be inverted and reinstalled, distributing wear across the full plate and extending the replacement interval. Duma's technical team can confirm whether this applies to your specific crusher model and frame configuration.
What warranty and after-sales support does Duma provide?
All plates carry a 12-month warranty against casting defects from the delivery date. Technical support - including wear analysis from site photos, installation guidance, and alloy consultation for reorders - is available through Duma's engineering team. For quality concerns, material reports, heat treatment curves, and NDT records for the relevant production batch are available on request.
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