Bulk Pack Track Chain Fasteners Excavator Bolt Nuts Crawler Dozer Track Optimal Torque Specs Wear Resistance

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:

OEM-Specific Kits:

Installation Protocol:

1. Pre-heat: Bolts to 150°C (infrared) in sub-zero environments

2. Torque Sequence:

   • Step 1: 30% spec torque (e.g., 330 Nm for M24)

   • Step 2: 60% spec torque

   • Step 3: 100% + 90° angle tightening

3. 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)

Key Technical Highlights

1. Metallurgy:

   • 25% Cr / 15% Ni / 2% Ti / 1.5% Mo composition

   • Solution treated @ 980°C → Aged @ 720°C

2. Coating Science:

   • Hot-dip aluminizing @ 700°C → Diffusion annealing

   • Sealer: Waterglass-based SiO₂ ceramic (5–8µm)

3. Testing Compliance:

   • Creep rupture: 10,000 hrs @ 600°C / 350 MPa (ISO 204)

   • Charpy V-notch: 50J min @ -196°C (LNG applications)

4. Endurance Data:

   • Field lifespan: 2–3× standard bolts in kiln feed dozers

   • Maintenance cost reduction: 41% (Case study: Copper smelter, Chile)

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   • WhatsApp:+861803906767

Quanzhou Yangxin Machinery Co., Ltd. was founded in 2017 and is located in Quanzhou, Fujian Province, on the Silk Road. It is adjacent to Quanzhou Jinjiang Airport and has convenient transportation. Our company specializes in producing high-strength track shoes, bolts, and various chassis vulnerable parts. Our products undergo strict inspections before leaving the factory and are sold well throughout the country. We adhere to the business philosophy of "quality first, customer first",