⚙️ Technical Compatibility
- Hole Size: Custom to requirements
- Compression Ratio: Tailored to feed formula
Buhler 520.138 Ring Die for Poultry Feed (3.8mm)
Swiss Engineering Precision: Reverse-engineered to Buhler's original 520.138 specifications with exact screw thread pitch and flange diameter for guaranteed fit.
4-Axis Gun Drilling: Smooth inner hole walls from gun drilling prevent feed buildup and ensure consistent pellet quality throughout the production run.
| Material | X46Cr13 Stainless Steel |
| Hole Size | 2.0 - 4.5 mm |
| Compression Ratio | 1:8 - 1:11 |
| Hardness | HRC 52-55 |
| Feature | Screw Mounting / Buhler Original Spec |
Why Choose Hongyue Spare Parts?
Precision manufacturing for ultimate pelleting performance.
CNC Gun Drilling
Imported 4-axis gun drilling center ensures ultra-smooth inner hole finish (Ra 0.8), reducing blockage and improving pellet quality for consistent feed output.
Vacuum Heat Treatment
Computer-controlled vacuum quenching achieves uniform HRC 52-56 hardness throughout the die body, preventing premature cracking under heavy pelleting loads.
Precision Counter-Sink
Multi-step counter-sinking and chamfering process creates a smooth entry cone for each hole, ensuring consistent feed flow and reduced energy consumption.
Premium Material & Extended Lifespan
Forged from high-grade X46Cr13 (Stainless Steel), our replacement ring dies and roller shells offer superior resistance against corrosion and abrasive wear during high-temperature pelleting. Processed through advanced vacuum heat treatment, we ensure a uniform hardness (typically HRC 52-56), which maximizes output capacity while minimizing the cost per ton of feed produced.
Frequently Asked Questions
Is this Buhler 520.138 die compatible with the 520.178? ▼
Yes, our replacement die fits both Buhler 520.138 and 520.178 models as they share identical mounting specifications.
What is gun drilling and why does it matter? ▼
Gun drilling is a precision machining process that creates perfectly straight, smooth holes. This prevents feed from sticking and reduces energy consumption by up to 15%.
Why Material Matters
The lifespan of a ring die is determined by its material composition and heat treatment. We use only certified X46Cr13 stainless steel and 20CrMnTi alloy steel, processed through vacuum heat treatment to ensure uniform hardness and maximum wear resistance.
🐟 Feed Ring Die Material
X46Cr13 Stainless Steel
- • Hardness: HRC 52-56
- • Feature: Excellent corrosion resistance for aqua feed
- • Surface Finish: Mirror-polished holes (Ra ≤ 0.8)
🪵 Biomass Ring Die Material
20CrMnTi Alloy Steel
- • Hardness: HRC 55-62
- • Feature: High impact strength for wood fibers
- • Tensile Strength: ≥ 1080 MPa
Hole Finish
Ra 0.8
Precision Gun Drilling
Hardness
HRC 52-62
Vacuum Heat Treatment
Accuracy
100% Check
Final Quality Inspection
✓ OEM Brand Compatibility
* Disclaimer: Hongyue Machinery is an independent manufacturer of premium aftermarket replacement parts. Any reference to original equipment manufacturer (OEM) brand names, trademarks, or machine models (such as CPM, Buhler, Muyang, Zhengchang, etc.) is strictly for the purpose of identifying compatibility. We are not affiliated with, sponsored by, or endorsed by these manufacturers.