Critical Infrastructure Hardware

High-Strength Structural Bolts & Tower Connection Hardware

Grade 10.9/12.9 hot-dip galvanized fasteners engineered for 50+ year service life in extreme transmission and communication tower applications

23 Years Manufacturing
1000+ Employees
China Southern Power Grid Certified Supplier
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Critical Connection Technology for Global Infrastructure

As a critical safety component in Xytower's international tower projects across Malaysia, Myanmar, and Thailand, our structural bolts and connection hardware undergo rigorous quality control. With 1000+ employees dedicated to manufacturing excellence, we ensure consistent quality for government-grade infrastructure that meets the demanding standards of China Southern Power Grid and international EPC contractors.

  • Hot-Dip Galvanizing per ISO 1461

    ≥85μm zinc coating thickness ensures 1000+ hour salt spray resistance for tropical and coastal environments

  • Mechanical Grades 8.8, 10.9, 12.9

    Fully compliant with ASTM A325/A490 and GB/T 1231 standards for high-strength structural bolting

  • Proven in Southeast Asian Climates

    Engineered for high-vibration environments and tropical corrosion conditions with validated field performance

  • Universal Compatibility

    Designed for seamless integration with lattice towers, monopoles, and substation gantries across all major standards

ISO 9001:2015
SGS Certified
CSG Approved

Technical Specifications

Comprehensive engineering data for specification and procurement. All measurements conform to international standards with full traceability documentation.

Dimensional Range

M16 — M64

Length: 40mm to 600mm standard. Custom machining available for non-standard applications upon request.

Material Specifications

40Cr / 35CrMo / 42CrMo

Alloy steel per GB/T 3077. Carbon steel 45# per GB/T 699 available for standard grades.

Surface Treatment

80-120μm HDG

Hot-dip galvanized per ASTM A153. Dacromet 500+ hours SST available for marine environments.

Grade Tensile Strength Yield Strength Hardness (HRC) Application
8.8 ≥800 MPa ≥640 MPa 22-32 Standard structural
10.9 ≥1040 MPa ≥940 MPa 32-39 High-load transmission
12.9 ≥1220 MPa ≥1100 MPa 39-44 Critical connections
Diameter (mm) Grade 10.9 Torque (N·m) Grade 12.9 Torque (N·m) Friction Coefficient Pre-tension (kN)
M16 210-280 250-330 0.10-0.14 95-125
M20 420-560 500-660 0.10-0.14 148-195
M24 720-960 860-1140 0.10-0.14 215-285
M30 1450-1930 1730-2290 0.10-0.14 345-455
M36 2520-3360 3000-3980 0.10-0.14 510-675

Thread Standards: Metric coarse thread ISO 261, tolerance 6H/6g. UN threads available per UNC/UNF specifications. Contact engineering for custom thread profiles.

Quality Assurance & Testing Protocols

Every batch undergoes comprehensive testing from raw material verification through final inspection, ensuring compliance with international standards.

Incoming Material Control

  • Spectrometry analysis for chemical composition
  • Ultrasonic testing for internal defects
  • Hardness verification per batch
  • Mill certificate authentication

Manufacturing Precision

  • CNC machining tolerance ±0.05mm
  • Thread rolling for grain flow integrity
  • 100% dimensional inspection
  • Heat treatment batch records

Finishing & Protection

  • Centrifugal spinning post-galvanizing
  • Coating thickness gauge inspection
  • Adhesion testing per ISO 2178
  • Salt spray test certification

Complete Documentation Package

Every shipment includes Mill Test Certificates (MTC) 3.1 per EN 10204, galvanizing batch records traceable to specific tower projects, and mechanical test reports. Digital documentation available via customer portal.

Application Engineering

Specialized solutions engineered for diverse transmission infrastructure requirements across voltage classes and environmental conditions.

Transmission

Lattice Transmission Towers

Primary member connections, bracing nodes, and leg splices for 110kV through 1000kV transmission lines. Optimized for high-tension loading and wind-induced vibration.

  • 110kV - 1000kV compatible
  • High-vibration rated
  • Fatigue resistant design
Monopole

Monopole Flange Connections

High-tension bolting systems for tubular tower section joints. Weather-sealing compatibility ensures corrosion protection at critical connection points.

  • Flange-to-flange optimized
  • Weather-seal compatible
  • Section joint rated
Substation

Substation Steel Structures

Transformer bushing support brackets, switchyard gantries, and rigid bus connections. Engineered for electrical clearances and seismic loading requirements.

  • Seismic rated
  • Electrical clearance compliant
  • Gantry optimized
Marine

Coastal & Marine Variants

Enhanced protection for offshore platforms, coastal wind farms, and marine environments. 120μm+ galvanizing or Dacromet coating for 500+ hour salt spray resistance.

  • 120μm+ zinc coating
  • 500+ hr SST rated
  • Offshore certified
Telecom

Communication Tower Hardware

Antenna mounting brackets, sector frame connections, and microwave platform supports. Non-ferrous options available for RF-sensitive applications.

  • Antenna mount rated
  • RF-compatible options
  • Platform support rated
Custom

Custom Engineered Solutions

Non-standard dimensions, specialized materials, and project-specific configurations. Full engineering support from concept through installation.

  • Custom dimensions
  • Special materials
  • Engineering support