Heavy-Duty Arm Cap for Single-Cylinder Cone Crushers
Engineered by NMS – The Guardian of Eccentric Assembly
Precision Arm Cap Assembly
Compatible with Metso HP/GP, Sandvik CH/CS Series & Equivalent Crushers
Structural Integrity Redefined
► Monobloc Forged Construction
Material: AISI 4140 Chromoly Steel (UTS ≥950 MPa)
Process: Closed-die forging + sub-zero tempering
Fatigue strength: 3X industry standard (per ISO 1143 test data)
► Dynamic Load Optimization
FEA-validated rib geometry distributes crushing forces
Withstands peak loads >400 kN without deformation
► Integrated Dust Defense
Triple-labyrinth seal channels + PTFE scraper ring
Particle exclusion efficiency: 99.8% @ 20μm
Performance Validation
| Parameter | NMS Arm Cap | Conventional Cap |
|---|---|---|
| Impact Resistance | 85 J/cm² (Charpy) | 45 J/cm² |
| Surface Hardness | 48-52 HRC | 35-40 HRC |
| Weight Accuracy | ±0.8% | ±3% |
| Alignment Tolerance | ±0.1° | ±0.5° |
Operational Advantages
▣ Zero-Premature-Failure
Eliminates arm shaft fretting corrosion (validated in 12,000 hr taconite operations)
▣ 15-Minute Replacement
Keyless taper lock design requires only standard hand tools
▣ Energy Efficiency
Low-friction nitride coating reduces hydraulic power draw by 8%
Engineering Details
Thermal Management: Internal cooling fins lower operating temp by 15°C
Corrosion Defense: Zinc-nickel electroplating (ISO 9227 salt spray >1,200 hr)
Maintenance Alerts: Wear indicator grooves provide visual service life warnings
Application Scenarios
High-vibration sites with >6g RMS acceleration
Coastal quarry operations with saltwater exposure
Automated crushing plants requiring predictive maintenance compatibility
NMS Commitment to Crusher Longevity
Designed to synergize with NMS Arm Bushings for complete eccentric system protection.