1. Introduction to Wear Parts Fastening Kits
Our wear parts fastening kits are precision-engineered to secure critical components in Metso C-Series jaw crushers (C80 to C200). These kits ensure:
Safe and reliable operation – Prevents part detachment under high crushing forces
Extended service life – Reduces wear due to vibration and movement
Simplified maintenance – Standardized components for faster replacements
The kits include hammer screws, rubber plates, spring casings, washers, cup springs, hexagonal nuts, protection plates, fastening items, and wedges, all designed for Metso jaw crushers.
2. Key Fastening Components & Their Functions
(A) Fastening Items for Hammer Screws & Springs
The hammer screw assembly ensures the hammer mechanism stays locked in place under impact loads. Components include:
Hammer screws – High-tensile bolts securing hammers
Spring casings – Houses compression springs for shock absorption
Rubber plates – Dampens vibration, reducing fatigue on fasteners
Hexagonal nuts & washers – Maintain clamping force under dynamic loads
Critical Note: Regular inspection of cup springs (Belleville washers) is essential – they lose tension over time and must be replaced to prevent looseness.
(B) Protection Plates & Fasteners
Protection plates shield critical areas from abrasive wear caused by feed material. Secure them with:
Plate fasteners – Hardened bolts with locking features
Protection plates – High-wear-resistant steel for extended service
Installation Tip: Ensure plates are flush with mounting surfaces—any gaps can lead to accelerated wear or fastener failure.
(C) Fastening Items for Lower Wedges
Lower wedges hold the fixed jaw in place. Their fastening system includes:
Hexagonal bolts – Heavy-duty fasteners for the wedge locking mechanism
Plain washers – Distribute load evenly to prevent surface damage
Hexagonal nuts – Self-locking design to withstand vibration
Failure Warning: If lower wedges loosen, the jaw plate can shift, causing misalignment and excessive wear.
(D) Wedge Systems (Tightening, Fill, and Mounting Wedges)
Our wedge system is critical for quick jaw plate replacement and secure fit. It consists of:
Tightening wedges – Adjustable for fine positioning
Fill wedges – Take up gaps between jaw plates and crusher frame
Mounting wedges – Permanent fixtures for structural integrity
Troubleshooting: If wedges become stuck, apply a recommended anti-seize compound (e.g., LOCTITE® 243) during installation.
3. Installation Guidelines for Peak Performance
(1) Pre-Installation Checks
Verify all hammer screws, washers, and spring casings are free of damage
Inspect protection plates for cracks – replace if worn beyond tolerance
Check wedge seating surfaces for deformation
(2) Torque Specifications & Fastening Best Practices
| Component | Critical Torque (Example for C160) | Lubrication Required? |
|---|---|---|
| Hammer screws | 350–450 Nm | Yes (High-pressure grease) |
| Hexagonal nuts (wedge system) | 700–800 Nm | No (Self-locking) |
| Protection plate fasteners | 250–300 Nm | Optional (Anti-seize) |
Key Installation Rule:
Follow a cross-tightening sequence to ensure even pressure distribution
Re-torque after 8–24 hours of operation
4. Failure Modes & Preventive Maintenance
(A) Common Issues & Solutions
Proper maintenance of wear parts fastening systems is crucial to preventing unplanned downtime and costly repairs. Several common failure modes require particular attention.
Loosening hammer screws → Replace spring casings, ensure proper preload
Worn rubber plates → Inspect every 500 hours, replace if cracked
Wedge slippage → Verify fill wedges are correctly sized
(B) Recommended Replacement Intervals
| Component | Replacement Frequency |
|---|---|
| Cup springs (Belleville washers) | 3,000–4,000 operating hours |
| Protection plates | Inspect monthly, replace as needed |
| Hammer screws | Check every 1,000 hours |
5. Why Choose Our Fastening Kits?
Guaranteed Fit & Performance – Components are machined to exact OEM tolerances
Superior Material Quality – High-grade steel for longer service life
Safety-Compliant – Engineered to prevent catastrophic failures
Contact us for specifications and quotes on jaw crusher wear parts fastening kits from brands like Metso, Sandvik, Terex, etc.
