
Transmission Towers
All types of voltage levels and configurations
Pre-Assembled for Perfect Fit. Built for Reliability.
Trial assembly is a critical process to ensure the accuracy, interchangeability and fit-up of all components before galvanizing and delivery. ZZ Steel performs trial assembly for all transmission towers, steel poles, crossarms and substation structures to guarantee smooth on-site erection and project success.

We provide trial assembly for a wide range of products to ensure every component meets design requirements and can be assembled smoothly on-site.

All types of voltage levels and configurations

Single circuit, double circuit and multi-circuit poles

Various crossarm types for different applications

Portal frames, gantries and support structures

Self-supporting towers and accessories





Verify overall dimensions and critical distances

Ensure bolt holes alignment and fit-up accuracy

Check bolt length, washers and tightening space

Ensure structure verticality and member flatness

Ensure stability and no deformation

Complete inspection and approve for next step
Our trial assembly services are widely used in:
ZZ Steel is committed to providing high quality steel structures and professional
trial assembly services for global customers.