Hot-Dip Galvanized Z-Type Right-Angle Clevis Link
The Z-type right-angle clevis link is a mechanical connection fitting used in overhead transmission lines, distribution lines and substations. Its offset double-plate structure connects two adjoining fittings while changing or accommodating the orientation of the hardware assembly.
The fitting consists of two formed steel plates and two removable clevis pins or bolts. Each connection end can receive a compatible eye, tongue, clevis or plate fitting. Nuts and retaining pins prevent accidental loosening after installation.
The main steel components are normally protected by hot-dip galvanizing for outdoor service. Product dimensions, pin diameters, opening widths and specified mechanical loads must be matched with the adjoining fittings and the approved insulator-string drawing.
Important: The photographs show the general Z-type construction but do not identify the exact model. Do not list the product as Z-7, Z-10, Z-12 or another specific load grade until its dimensions and mechanical test data have been confirmed.
Key Features
- Offset double-plate construction
- Two clevis connection ends
- Designed to connect overhead-line hardware in different orientations
- Removable pins or bolts simplify assembly and maintenance
- Retaining-pin holes help prevent nut loss
- Carbon-steel construction for mechanical strength
- Hot-dip galvanized finish for outdoor corrosion protection
- Different dimensions and mechanical-strength grades available
- Custom production according to approved drawings
Typical Technical Specifications
| Product Type | Z-Type Clevis Link / Right-Angle Clevis |
|---|---|
| Fitting Category | Overhead-Line Connection Fitting |
| Structure | Offset double plates with two removable pins or bolts |
| Main Material | Carbon steel |
| Pin / Bolt Material | Carbon steel |
| Retaining Pin Material | Stainless steel or galvanized steel, subject to specification |
| Surface Finish | Hot-dip galvanized |
| Representative Models | Z-7, Z-7B, Z-10, Z-10B, Z-12, Z-16, Z-20, Z-25, Z-30 and Z-40 |
| Representative Failure-Load Classes | 70, 100, 120, 160, 200, 250, 300 and 400 kN |
| Installation | Clevis-pin or bolted mechanical connection |
| Application | Suspension strings, tension strings and line-hardware assemblies |
| Customization | Plate thickness, opening width, pin diameter, overall length, load class and coating |
The models and load classes above are representative selection data only. Availability and rated performance must be confirmed using the manufacturer’s approved drawing and test report.
Representative Model Selection
| Model | Representative Pin Size | Representative Height | Representative Failure Load |
|---|---|---|---|
| Z-7 | 16 mm | 60 mm | 70 kN |
| Z-10 | 18 mm | 70 mm | 100 kN |
| Z-12 | 22 mm | 80 mm | 120 kN |
| Z-16 | 24 mm | 90 mm | 160 kN |
| Z-20 | 27 mm | 120 mm | 200 kN |
| Z-25 | 30 mm | 110 mm | 250 kN |
Model dimensions vary between manufacturers and project standards. The table must not replace the final dimensional drawing.
Function in an Insulator-String Assembly
The Z-type clevis link is installed between compatible connection fittings where the connection position or orientation must be changed. Typical adjoining components include suspension clamps, strain clamps, socket clevises, ball eyes, yoke plates, U-type clevises and other link fittings.
The opening width and pin diameter at both ends must be compatible with the adjoining fittings. The complete assembly must also have a coordinated mechanical-strength grade.
Materials and Manufacturing
The two main plates are normally manufactured from formed carbon steel. The offset profile is produced to provide the required connection geometry while maintaining adequate clearance between adjoining fittings.
Connection pins or bolts are manufactured from steel of the specified mechanical grade. Where split pins or R-clips are used, corrosion-resistant steel is recommended for dependable outdoor retention.
Material grades, heat treatment, welding restrictions and dimensional tolerances must follow the approved manufacturing drawing and purchase specification.
Hot-Dip Galvanized Finish
The steel components are normally hot-dip galvanized after forming and machining. The zinc coating protects exposed steel surfaces against atmospheric corrosion in overhead-line and substation environments.
Galvanizing requirements may be specified according to ISO 1461, ASTM A153/A153M, GB/T 13912 or a utility-specific coating specification. Threads, pin holes and contact surfaces must remain functional after galvanizing.
Applications
- Overhead transmission-line insulator strings
- Overhead distribution-line hardware assemblies
- Suspension clamp assemblies
- Strain and dead-end assemblies
- Tower and crossarm connection hardware
- Substation bus-support assemblies
- Insulator-string orientation conversion
Installation Guidance
- Confirm the required model, mechanical load and installation drawing.
- Check that both clevis openings match the adjoining fittings.
- Confirm the pin diameters and available articulation clearances.
- Inspect the plates, pins, threads and zinc coating before installation.
- Insert each adjoining fitting fully into the appropriate clevis opening.
- Install the pins or bolts in the direction shown on the approved drawing.
- Tighten threaded components according to the specified assembly requirement.
- Install all retaining pins and open or lock them correctly.
- Confirm that the assembly can articulate without interference or edge loading.
Quality Inspection
- Raw-material verification
- Plate thickness and dimensional inspection
- Clevis-opening and pin-diameter inspection
- Bending-profile and alignment inspection
- Thread and nut-fit inspection
- Retaining-pin assembly inspection
- Hot-dip galvanized coating inspection
- Mechanical load testing when specified
- Marking and packaging inspection
Reference Standards
- IEC 61284:1997 – Overhead lines: requirements and tests for fittings
- DL/T 759-2023 – Link fittings
- GB/T 2314-2008 – General technical requirements for electric power fittings
- ISO 1461:2022 – Hot-dip galvanized coatings on fabricated iron and steel articles
- Applicable utility specifications and approved project drawings
Reference to a standard does not constitute certification. Compliance must be supported by inspection records and test reports for the exact product model.
Ordering Information
Please provide the following information when requesting a quotation:
- Required model or approved drawing
- Specified mechanical load
- Opening width at each end
- Pin or bolt diameter at each end
- Overall length and plate thickness
- Steel material grade
- Hot-dip galvanizing requirement
- Required standard and test documentation
- Quantity, marking and packaging
Frequently Asked Questions
What is the difference between a Z-type clevis and a P-type link?
A Z-type clevis uses an offset configuration to change or accommodate the connection orientation. A P-type parallel link normally uses straight parallel plates and maintains a parallel connection arrangement.
Can the model be identified from the photograph?
No. Models such as Z-7 and Z-10 may have a similar appearance. The opening widths, pin diameters, overall dimensions and mechanical test data must be measured and verified.
Are the pins included?
The complete fitting is normally supplied with the required pins or bolts, nuts and retaining components. The exact supply scope must be stated in the quotation and packing list.
Is this product IEC certified?
IEC 61284 may be used as a reference for overhead-line fitting requirements and testing, but certification or compliance must not be claimed without documentation covering the exact product model.
