Hot-Dip Galvanized UB-Type Clevis Link for Overhead Lines
The UB-type clevis link is a mechanical connection fitting designed for overhead transmission and distribution-line hardware assemblies. It is commonly installed between a pole or tower attachment point and an insulator string, suspension assembly, tension assembly, earth-wire fitting or other compatible link fitting.
The fitting consists of a U-shaped steel body with two removable bolts or pins. Hex nuts and cotter pins secure the connection points and help prevent accidental loosening after installation. The two connection positions allow the fitting to join compatible plate-type and clevis-type hardware while transmitting the mechanical load through the fitting string.
The product shown in the photograph includes a clearly marked UB-10 model. Other commonly specified models include UB-7, UB-12, UB-16, UB-21 and UB-25. Model selection must be based on the required nominal failure load, bolt diameter, internal dimensions and compatibility with the adjacent hardware.
Important: This is an overhead-line connection fitting. It is not a commercial lifting shackle and must not be advertised or used as lifting or rigging hardware.
Key Features
- U-shaped clevis-link construction for overhead-line assemblies
- Two removable bolted connection points
- Hex nuts and cotter pins provide mechanical retention
- Designed to transfer tensile mechanical loads within a fitting string
- Available in several load classes and connection dimensions
- Hot-dip galvanized finish available for outdoor corrosion protection
- Suitable for suspension, tension and overhead earth-wire assemblies
- Dimensions, marking and packaging can be customized according to approved drawings
Typical Technical Specifications
| Product Type | UB-Type Clevis Link / UB-Type Clevis Hanger |
|---|---|
| Product Category | Overhead-Line Connection Fitting |
| Representative Models | UB-7, UB-10, UB-12, UB-16, UB-21 and UB-25 |
| Body Material | Carbon steel or structural steel according to the approved drawing |
| Fastener Material | Carbon steel |
| Connection Components | Steel bolts or pins, hex nuts and cotter pins |
| Surface Finish | Hot-dip galvanized |
| Installation Method | Bolted and pinned mechanical connection |
| Application | Suspension strings, tension strings, earth-wire assemblies and tower-side connections |
| Customization | Model, dimensions, load class, bolt size, coating, marking and packaging |
Representative Model Data
| Model | C (mm) | M (mm) | H (mm) | L/A (mm) | Nominal Failure Load (kN) | Reference Weight (kg) |
|---|---|---|---|---|---|---|
| UB-7 | 18 | 16 | 70 | 45 | 70 | 0.75–0.80 |
| UB-10 | 20 | 18 | 80 | 45 | 100 | 1.08–1.10 |
| UB-12 | 24 | 22 | 100 | 60 | 120 | Approximately 2.82 |
| UB-16 | 26 | 24 | 100 | 60 | 160 | Approximately 2.89 |
| UB-21 | 30 | 27 | 120 | 70–72 | 210 | Subject to drawing |
| UB-25 | 30 | 30 | 120 | Approximately 62 | 250 | Subject to drawing |
The table contains representative market dimensions rather than confirmed Jiujin Power production data. Dimension-symbol definitions, tolerances, weight and nominal failure load must be verified against the factory drawing and mechanical test report before publication.
Construction
The main body is formed from steel into a U-shaped connection structure. Each connection point is fitted with a removable steel bolt or pin. Depending on the approved design, the fasteners may use hex nuts, washers and cotter pins to prevent loosening during service.
The bolt diameter, clear opening, internal height and connection direction must match the tower attachment and the next fitting in the assembly. Components from different load classes must not be combined without an engineering compatibility check.
Hot-Dip Galvanized Finish
Hot-dip galvanizing provides a protective zinc coating for steel components exposed to rain, humidity and outdoor atmospheric conditions. The required coating thickness, zinc adhesion and surface quality should be specified in the purchase order or project specification.
The galvanized surface may show minor differences in color, brightness and texture resulting from the dipping, cooling and handling processes. These differences do not by themselves determine coating conformity.
Applications
- Overhead transmission-line insulator strings
- Distribution-line suspension assemblies
- Tension and dead-end hardware assemblies
- Overhead earth-wire and OPGW fitting strings
- Connections between tower attachment plates and line fittings
- Substation and utility connection assemblies
Selection Guidelines
- Confirm the required nominal failure load of the complete fitting string.
- Select a UB model with dimensions compatible with the adjacent hardware.
- Check the bolt or pin diameter and the corresponding connection-hole diameter.
- Verify the clear opening and internal height required for assembly movement.
- Confirm that the connected components have compatible load classes.
- Specify the steel grade and hot-dip galvanized coating requirements.
- Use the approved project drawing as the final selection reference.
The voltage rating of the transmission or distribution line does not by itself determine the UB clevis model. Mechanical loading and dimensional compatibility are the principal selection factors.
Installation Guidance
- Inspect the body, bolts, nuts and cotter pins before installation.
- Confirm that the product model matches the approved assembly drawing.
- Align the holes without hammering or forcibly deforming the fitting.
- Insert the bolts or pins in the direction specified by the installation drawing.
- Tighten the nuts according to the approved installation procedure.
- Install and correctly open the cotter pins to prevent disengagement.
- Check that the completed connection can articulate as required without interference.
- Replace fittings showing cracks, severe corrosion, deformation or elongated holes.
Quality Inspection
- Material certificate and dimensional verification
- Body shape, opening and hole-alignment inspection
- Bolt, nut and cotter-pin assembly inspection
- Visual inspection for cracks, burrs and harmful deformation
- Hot-dip galvanized coating appearance and thickness inspection
- Mechanical load testing according to the agreed specification
- Model marking, quantity and packaging inspection
Reference Standards
- DL/T 759-2023 – Connecting fittings
- GB/T 2314-2008 – General technical requirements for electric power fittings
- IEC 61284 – Overhead lines: requirements and tests for fittings, when contractually applicable
- ISO 1461:2022 – Hot-dip galvanized coatings on fabricated iron and steel articles
- Approved utility drawings and customer technical specifications
Listing a reference standard does not constitute certification. Compliance must be supported by drawings, inspection records and test reports for the exact product model supplied.
Ordering Information
Please provide the following information when requesting a quotation:
- Required model, such as UB-7, UB-10, UB-12 or UB-16
- Required nominal failure load
- Main connection dimensions and dimensional drawing
- Bolt or pin diameter
- Steel material grade
- Hot-dip galvanized coating requirement
- Applicable standard or utility specification
- Required mechanical and coating test documents
- Order quantity, marking and packaging requirements
Frequently Asked Questions
What does UB-10 mean?
UB identifies the fitting series. In commonly used product tables, UB-10 corresponds to a nominal failure-load class of 100 kN. The exact dimensions and performance must still be confirmed against the manufacturer’s approved drawing.
Is the UB-type clevis selected according to line voltage?
No. Line voltage alone is not sufficient. Selection is mainly based on mechanical load, bolt diameter, connection dimensions and compatibility with the complete hardware string.
Is this the same product as a U-type shackle?
No. The UB-type clevis has a formed plate body and two bolted connection positions. A conventional U-type shackle or U-shaped link has a different structure and should be listed separately.
Can it be used for lifting?
No. This product is designed as overhead-line hardware and should not be marketed as lifting or rigging equipment.
Are bolts, nuts and cotter pins included?
They are normally supplied as part of the fitting assembly, but the exact supply scope must be confirmed in the quotation and packing list.
