3-5 Registration Eye (3-5A Clamp Type / 3-5B70 Single-Eye)
Split clamp ring providing adjustable, rotatable connection points on cantilever and positioning tubes.
Specifications
| Model | 3-5A (Φ34/Φ48/Φ60), 3-5B70 |
|---|---|
| Drawing No. | 3-5A |
| Standard | TB/T 2075.3-2024 — Part 3: Limit-type positioning devices |
| Design Speed | Tube-mount connection point for ≤250 km/h (3-5A steel) and 250–350 km/h aluminum systems (3-5B70) |
| Materials | Forged galvanized steel (3-5A); cast aluminum body (3-5B70) |
| Installation | Clamped onto cantilever or positioning tubes as a rotatable connection point for ropes and braces |
The 3-5 registration eye is a split clamp ring that bolts around cantilever tubes, inclined cantilevers or positioning tubes and provides a connection ear for braces, suspenders and wind brace ropes. Because it is split, it installs without sliding anything over the tube end, and it can be set anywhere along the tube and rotated to aim the ear.
Two families cover the systems: 3-5A clamp-type eyes in forged, galvanized steel for Φ34, Φ48 and Φ60 tube diameters, and the 3-5B70 single-eye type — a cast aluminum body with rotating double ear bored φ70, matching the φ70×6 aluminum cantilever tubes of 250–350 km/h aluminum systems.
Design Features
- Φ34 / Φ48 / Φ60 (3-5A) and φ70 aluminum (3-5B70) cover the tube families
- Split design installs anywhere on the tube without dismantling the end
- Axial and circumferential adjustment simplifies aiming of braces and ropes
- Ear hole dimensions standard for suspenders, braces and wind brace fittings
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.
Henan Chuangwit Railway Equipment Co., Ltd. supplies this locator with selection calculations, matched fittings and site technical guidance for traction power projects. 3-5A is the forged steel clamp-type eye for Φ34/Φ48/Φ60 steel tubes; 3-5B70 is the cast aluminum single-eye type with a φ70 bore and rotating ear, made for the φ70×6 aluminum cantilever tubes of 250–350 km/h systems. Yes — the split ring opens, clamps around the tube and bolts closed, so it can be added or repositioned without sliding it over the tube end. Suspenders, positioning tube braces, wind brace ropes and similar fittings whose pin or eye dimensions match the standardized ear hole. Loosen the clamp bolts, rotate the ring about the tube and slide it axially, then re-tighten — both directions are adjustable.Frequently Asked Questions
What is the difference between 3-5A and 3-5B70?
Can it be installed without removing the tube?
What connects to the ear?
How is the eye aimed?
Performance
Operating Conditions
Outdoor service at OCS registration points on mainline, high-speed and station structures, subject to suspension, wind, ice and dynamic pantograph loads as defined by the OCS design.
Mechanical Performance
Clamp grip and ear strength carry brace and rope loads; split ring retightens without tube deformation.
Applications
High-Speed Aluminum
3-5B70 matches φ70 aluminum cantilevers.
Station Yards
Aim the ear any direction for rope runs.
Retrofit & Repair
Split ring bolts on without tube disassembly.
Standard Assemblies
One ear standard across rope fittings.
