12-4 Tongue-Eye Rod (Φ16, Φ20)
Tongue-to-eye transition link between connection families in OCS tensioning systems.
Specifications
| Model | 12-4 |
|---|---|
| Standard | TB/T 2075.12-2024, Fittings for overhead contact system of electrification railway — Part 12: Pulley compensation devices |
| Installation | As a connection conversion link in compensation assemblies: tongue end to tongue-type fittings, eye end to eye-type fittings |
The 12-4 tongue-eye rod is the transition link between connection families in compensation and anchoring systems: one end is a tongue (ball-end) connection, the other an eye connection, so components of the two families can be joined reliably.
Manufactured to TB/T 2075.12-2024, Fittings for overhead contact system of electrification railway — Part 12: Pulley compensation devices, the rod is available in Φ16 and Φ20 diameters matching the 12-3 double-eye rod grades. The tongue's fitting dimensions are held to close tolerance so the joint is secure without play, and assembly and removal stay convenient.
The forged rod is hot-dip galvanized for long outdoor service. The tongue-eye arrangement corresponds to the ball-eye link known from IEC 61466 fitting terminology, making the interface familiar for international projects.
Henan Chuangwit Railway Equipment Co., Ltd. supplies the 12-4 under CRCC certification within the complete TB/T 2075.12 compensation range, with drawing-matched production available for project-specific interfaces.
Frequently Asked Questions
What does the tongue-eye rod connect?
It converts between the two standard connection families of OCS fittings: a tongue (ball-end) connection on one side and an eye connection on the other — the ball-eye arrangement known from IEC 61466 terminology.
Which sizes are available?
Φ16 and Φ20 rod diameters, matching the 12-3 double-eye rod load grades.
Where is it used in the tensioning system?
Wherever tongue-ended and eye-ended components meet — compensation systems and anchoring arrangements — as the transition link between them.
Performance
Operating Conditions
Outdoor service in tension compensation and anchoring assemblies, transmitting rope and tension loads through moving and fixed joints.
Mechanical Performance
Forged tongue-eye rod (Φ16 / Φ20) converts between tongue and eye connection families inside the compensation linkage, keeping the load path through matched forged sections.
Applications
Connection Conversion
Joins tongue-type to eye-type fittings.
Forged Sections
Load path through forged material.
Two Sizes
Φ16 and Φ20 variants.
Compensation Linkage
Standard member of 12-series sets.
