Quanzhou Yangxin Machinery Co., Ltd.
Quanzhou Yangxin Machinery Co., Ltd.
Add to Cart
Bulk Pack Track Chain Fasteners: High-Quality Link Bolts with Hex Nuts for Crawler Excavator & Dozer Track Repair - Optimal Torque Specs, Wear Resistance, Reduced Vibration Loosening
Engineered for Thermal Extremes:
Material: A286 Superalloy (Fe-Ni-Cr) | ASTM A453 Grade 660
Temp Range: -200°C to +700°C Continuous Service
Coating: Aluminized Diffusion Layer (100µm) + Ceramic Sealer
Strength: 140 ksi Yield at 650°C (per ASTM E21)
Certifications: ASME B18.2.1, API 20E, DNV GL-OS-C401
Technical Superiority:
These bolts resist oxidation, creep deformation, and thermal cycling fatigue in environments where standard steel fasteners fail. The A286 core’s gamma-prime precipitates maintain 85% tensile strength at 600°C vs. 35% for Grade 8.8 steel. Aluminized coating forms a stable α-Al₂O₃ barrier, reducing scale formation by 90% (tested per ASTM G54). Rolled threads with UNJ profile (MIL-S-8879) prevent stress-cracking under rapid quenching scenarios.
Critical Applications:
Hot slag handling dozers (steel mills)
Underground coal fire zones
Arctic permafrost operations
Geothermal drilling rigs
Performance Validation:
| Test Condition | Result | Standard |
|---|---|---|
| Thermal Cycling (650°C ↔ 25°C, 500 cycles) | No thread galling 0.2% permanent elongation | ASTM E606 |
| Sulfur Resistance (H₂S 5% vol. at 450°C) | Corrosion rate: 0.01 mm/year | NACE TM0177 |
| Impact Toughness (-50°C) | 45J (min) | ISO 148-1 |
OEM-Specific Kits:
| Equipment | Bolt Size | Kit Includes |
|---|---|---|
| Caterpillar® D11T CD | M30x110mm | Bolt + RINGFEDER® lock washer |
| Liebherr® PR 776 Litronic | M27x95mm | Bolt + Nord-Lock X-series washer |
| Komatsu® D375A-8 | M36x130mm | Bolt + Schnorr SAF disc spring |
Installation Protocol:
Pre-heat: Bolts to 150°C (infrared) in sub-zero environments
Torque Sequence:
Step 1: 30% spec torque (e.g., 330 Nm for M24)
Step 2: 60% spec torque
Step 3: 100% + 90° angle tightening
Post-Installation: Apply high-temp anti-seize (Fe-based, 1,200°C rating)
Maintenance Advantages:
Reusability: Withstands 5 re-torque cycles at 500°C+
Inspection: Thermal discoloration indicator (blue hue = >550°C exposure)
Failure Prevention:
Zero liquid metal embrittlement (LME) with Zn/Al alloys
Immune to chloride stress corrosion cracking (CSCC)
Supply Options:
Standard: Zinc-nickel plated for indoor storage
Vacuum-Sealed: Argon-filled bags for critical projects
Traceability: Laser-etched QR codes → Material Certs (EN 10204 3.2)
Metallurgy:
25% Cr / 15% Ni / 2% Ti / 1.5% Mo composition
Solution treated @ 980°C → Aged @ 720°C
Coating Science:
Hot-dip aluminizing @ 700°C → Diffusion annealing
Sealer: Waterglass-based SiO₂ ceramic (5–8µm)
Testing Compliance:
Creep rupture: 10,000 hrs @ 600°C / 350 MPa (ISO 204)
Charpy V-notch: 50J min @ -196°C (LNG applications)
Endurance Data:
Field lifespan: 2–3× standard bolts in kiln feed dozers
Maintenance cost reduction: 41% (Case study: Copper smelter, Chile)
WhatsApp:+861803906767