1-1 Flat Cantilever (1-1AG60 / 1-1AL70)
Horizontal load-bearing tube of the OCS cantilever assembly — Φ60 steel and φ70×6 aluminum versions for lines up to 350 km/h.
Specifications
| Model | 1-1AG60 / 1-1AL70 |
|---|---|
| Drawing No. | 1-1AG |
| Standard | TB/T 2075.1-2024 — Part 1: Cantilever support devices |
| Design Speed | ≤250 km/h (1-1AG60) / 250–350 km/h (1-1AL70) |
| Materials | Hot-dip galvanized steel tube (Φ60); aluminum alloy tube 6082-T6 (φ70×6) |
| Installation | Mounted horizontally at the top of the OCS mast as the load-bearing tube of the cantilever assembly |
The 1-1 flat cantilever is the horizontal load-bearing tube of a cantilever support device for electrified railway overhead contact systems. One end joins the post-side insulator through a clevis single eye; the other end carries a messenger wire seat that supports the messenger wire. Connected to the inclined cantilever through the cantilever connector and stiffened by the support brace, it forms the stable triangular structure that carries both the vertical and horizontal loads of the contact suspension.
Two variants cover the main speed classes. The 1-1AG60 uses a Φ60 steel tube with hot-dip galvanized corrosion protection for lines up to 200 km/h and 200–250 km/h passenger dedicated lines. The 1-1AL70 uses a φ70×6 aluminum alloy tube in 6082-T6, paired with the AL70 series of aluminum cantilever fittings (messenger wire seat 1-4AL70 and related parts) for aluminum cantilever systems on 250–350 km/h lines.
Design Features
- Tube diameter matches the standard fittings family — messenger wire seats, clevis single eyes and support connectors clamp directly without adaptation
- Good tube straightness keeps load paths rational and simplifies cantilever pre-assembly and site adjustment
- Overall anti-corrosion treatment (hot-dip galvanizing on steel; natural aluminum oxide layer on AL70) suits long-term outdoor service
- Standardized hole patterns at both ends enable batch pre-assembly and interchangeable installation
The product is manufactured under CRCC railway product certification and an ISO 9001 quality management system, with incoming material inspection, in-process control on critical operations and batch-by-batch final inspection before delivery.
Typical applications are interstation and station OCS support structures on mainline, high-speed and mixed-traffic railways. Henan Chuangwit supplies the flat cantilever together with the complete fitting set, pre-assembly drawings and site technical guidance. It is the horizontal load-bearing tube of the cantilever support device: one end connects to the post-side insulator through a clevis fitting, the other end carries the messenger wire seat, and together with the inclined cantilever and the brace it forms a stable triangular structure that carries the vertical and horizontal loads of the contact suspension. 1-1AG60 is a Φ60 hot-dip galvanized steel tube for lines up to 250 km/h; 1-1AL70 is a φ70×6 aluminum alloy tube (6082-T6) with matching AL70-series fittings such as the 1-4AL70 messenger wire seat, used in aluminum cantilever systems for 250–350 km/h lines. Steel versions cover ≤200 km/h and 200–250 km/h lines (supplied in speed classes); the AL70 aluminum version covers 250–350 km/h high-speed systems. Yes. Chuangwit cantilever tubes are produced under CRCC railway product certification with ISO 9001 quality management, and type test documentation is available on request.Frequently Asked Questions
What does the flat cantilever do in a cantilever assembly?
What is the difference between 1-1AG60 and 1-1AL70?
Which speed classes does the 1-1 flat cantilever cover?
Is the 1-1 cantilever CRCC certified?
Performance
Operating Conditions
Outdoor service on mainline and station OCS support structures, carrying suspension loads, wind and vibration loads as defined by the OCS design.
Mechanical Performance
Controlled tube straightness and standardized connection holes support off-site pre-assembly; hot-dip galvanized steel or 6082-T6 aluminum construction resists long-term outdoor corrosion and vibration.
Applications
High-Speed Mainlines
AL70 aluminum version for 250–350 km/h lines.
Passenger Dedicated Lines
AG60 steel version for 200–250 km/h lines.
Station Yards
Uniform hole pattern speeds multi-track pre-assembly.
Icing & Wind Regions
Anti-corrosion construction for harsh climates.
