DB Type Hot-Dip Galvanized Steel Adjusting Plate
The DB type adjusting plate is a multi-hole connection fitting designed for overhead transmission and distribution-line hardware assemblies. By selecting a different connection hole, installers can adjust the effective length and relative position of an insulator string or associated line-fitting assembly.
The plate is commonly installed with clevis fittings, shackles, yoke plates, suspension hardware, tension hardware and other compatible link fittings. Its exact installation position and loading direction must follow the approved stringing drawing.
The product is manufactured from thick steel plate with multiple precision-formed connection holes. A hot-dip galvanized finish can be applied to provide corrosion protection for outdoor utility environments.
Important: Model number, dimensions, hole diameter, hole spacing, plate thickness and mechanical rating must be selected as one complete specification. Products with a similar appearance are not necessarily mechanically interchangeable.
Key Features
- Multiple connection holes provide selectable adjustment positions
- Heavy-duty single-plate steel construction
- Suitable for bolt, pin, clevis and shackle connections
- Designed for overhead-line insulator-string assemblies
- Hot-dip galvanized surface option for outdoor corrosion protection
- Available in different sizes and mechanical strength classes
- Hole spacing and plate dimensions can be manufactured to drawing
- Permanent model and traceability markings available
Typical Technical Specifications
| Product Type | Adjusting Plate / Multi-Hole Link Plate |
|---|---|
| Series | DB Series |
| Structure | Single steel plate with multiple connection holes |
| Representative Models | DB-7, DB-10, DB-12 and DB-16 |
| Base Material | Carbon steel or project-specified high-strength steel |
| Surface Finish | Hot-dip galvanized |
| Hole Diameter | According to model and approved drawing |
| Hole Spacing | Multiple adjustment positions according to model |
| Plate Thickness | According to mechanical rating and drawing |
| Connection Method | Bolt, pin, clevis or shackle connection |
| Application | Insulator strings and overhead-line hardware assemblies |
| Customization | Model, dimensions, hole pattern, material, load rating, coating and marking |
All dimensions and ratings must be confirmed using the approved product drawing. Representative model designations must not be treated as universally interchangeable specifications.
Representative Model Selection
| Model | Representative Hole Diameter | Representative Nominal Failure Load |
|---|---|---|
| DB-7 | 18 mm | 70 kN |
| DB-10 | 20 mm | 100 kN |
| DB-12 | 24 mm | 120 kN |
| DB-16 | 26 mm | 160 kN |
This table contains representative market data for preliminary selection only. Dimensions and mechanical ratings can differ between manufacturers and technical standards. The approved drawing and test report for the ordered model take precedence.
Materials and Construction
The adjusting plate is normally produced from carbon steel or another project-approved structural-steel grade. Plate thickness, hole-edge distance and transition radii are selected according to the required mechanical load and connection geometry.
Connection holes should have smooth edges and consistent diameters to reduce localized damage to mating pins or bolts. Flame-cut, punched, drilled or machined holes may be supplied according to the dimensional and surface requirements of the approved drawing.
Surface Treatment
Hot-dip galvanizing provides a protective zinc coating for outdoor transmission-line and distribution-line environments. Coating thickness, adhesion, appearance and repair requirements should be specified in the purchase documentation.
Threads, holes and connecting surfaces must remain suitable for assembly after galvanizing. Excess zinc, sharp projections and blocked holes should be removed without reducing the required corrosion protection.
Applications
- Overhead transmission-line insulator strings
- Distribution-line tension and suspension assemblies
- Adjustment of insulator-string connection length
- Connection between yoke plates and line fittings
- Substation bus and support-hardware assemblies
- Utility reconstruction and line-upgrade projects
Selection and Installation Guidance
- Confirm the required model and mechanical rating from the approved stringing drawing.
- Verify plate thickness, hole diameter, hole spacing and connection width.
- Select bolts or pins that match the specified holes and mating fittings.
- Use the designated hole position to obtain the required connection length.
- Ensure the assembly is loaded in the intended direction without excessive twisting.
- Install all locking devices, cotter pins and retaining components.
- Check that the selected position provides adequate clearance from adjacent hardware.
- Inspect the completed assembly for deformation, loose connections and coating damage.
Quality Inspection
- Raw-material verification
- Overall dimension and plate-thickness inspection
- Hole diameter, spacing and edge-distance inspection
- Surface inspection for cracks, burrs and sharp edges
- Hot-dip galvanized coating inspection when specified
- Mechanical load testing according to the agreed test plan
- Model marking and traceability inspection
- Packaging and quantity inspection
Reference Standards
- IEC 61284 – Requirements and tests for overhead-line fittings
- ISO 1461 – 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 claims must be supported by inspection or test documentation for the exact model supplied.
Ordering Information
Please provide the following information when requesting a quotation:
- Required DB model or approved drawing
- Nominal mechanical load or specified failure load
- Plate thickness and overall dimensions
- Hole diameter, quantity and center-to-center spacing
- Required steel material grade
- Hot-dip galvanized coating requirement
- Mating bolt, pin, clevis or shackle dimensions
- Required marking and traceability information
- Inspection reports and mechanical test requirements
- Order quantity and packaging requirements
Frequently Asked Questions
What is the function of a DB adjusting plate?
It provides several connection positions so that the effective length or relative position of an overhead-line hardware assembly can be adjusted.
Can different DB models be used interchangeably?
No. Models may have different dimensions, hole patterns, plate thicknesses and mechanical ratings. Compatibility must be checked against the approved drawing.
Is the product supplied with bolts or pins?
Bolts, pins and locking components may be included or supplied separately. The exact supply scope must be stated in the quotation and packing list.
Is the plate hot-dip galvanized?
A hot-dip galvanized version can be supplied. The coating method and minimum coating requirement must be confirmed in the purchase specification.
