Hot-Dip Galvanized Three-Bolt Guy Wire Clamp
The three-bolt guy wire clamp is a mechanical pole-line fitting used to grip galvanized steel guy strand in overhead power-distribution and telecommunications-pole guying systems. It is also known as a three-bolt strand clamp or marriage guy clamp in some markets.
The clamp consists of two formed carbon-steel plates assembled with three clamping bolts and nuts. Straight parallel grooves formed between the plates receive the guy strand. When the bolts are tightened, the clamping pressure is distributed along the contact area to secure the strand without the cutting action associated with sharp-edged gripping surfaces.
This product may be used to form a loop-type guy dead end, secure a strand termination or connect compatible sections of guy strand when permitted by the approved pole-line design. The exact clamp model must be selected according to the strand diameter, strand construction, required mechanical capacity and installation arrangement.
Important: This fitting is intended for steel guy strand. It is not an electrical conductor connector and should not be used as a suspension clamp unless the exact model has been specifically designed, tested and approved for that application.
Key Features
- Three-bolt construction for distributed clamping pressure
- Two formed steel plates with straight parallel strand grooves
- Suitable for galvanized steel guy strand
- Mechanical bolted assembly allows field installation and inspection
- Hot-dip galvanized surface available for outdoor corrosion protection
- Multiple clamp lengths and bolt diameters available
- Can be supplied for utility and telecommunications pole-line projects
- Strand range, dimensions, coating and marking can be customized
Typical Technical Specifications
| Product Type | Three-Bolt Guy Wire Clamp |
|---|---|
| Alternative Names | Three-Bolt Strand Clamp / Marriage Guy Clamp |
| Construction | Two grooved steel clamping plates with three bolt assemblies |
| Number of Bolts | 3 |
| Clamp-Plate Material | Carbon steel |
| Bolt and Nut Material | Carbon steel |
| Groove Type | Straight parallel groove |
| Surface Finish | Hot-dip galvanized, subject to order specification |
| Compatible Strand | Galvanized steel guy strand |
| Strand Diameter Range | Model-specific; confirm from approved drawing |
| Clamp Length | Model-specific |
| Bolt Diameter | Model-specific |
| Application | Guy-strand termination, loop formation and pole-line guying assemblies |
| Installation Method | Mechanical bolting |
| Mechanical Rating | According to approved drawing and mechanical test report |
| Customization | Strand range, clamp length, plate width, bolt diameter, coating, marking and packaging |
The specifications above describe the product construction shown in the photographs. Final dimensions, strand compatibility and mechanical performance must be confirmed using the approved product drawing and test documentation.
Construction and Working Principle
The two clamping plates are positioned on opposite sides of the guy strand. Their internal straight grooves guide and support the strand. Tightening the three bolt assemblies draws the plates together and generates mechanical gripping force over an extended contact length.
Three clamping points help distribute the pressure more evenly than a single-bolt arrangement. Correct bolt torque is essential: insufficient tightening may allow strand movement, while excessive tightening may deform the plates, damage the strand or overload the fasteners.
Typical Applications
- Overhead distribution-line pole guying
- Telecommunications-pole guy-wire assemblies
- Utility-pole reinforcement systems
- Loop-type guy-strand dead ends
- Guy-strand termination and securing
- Rural electrification projects
- Railway and roadside utility infrastructure
- Project-specific static steel-strand assemblies
Materials
The clamping plates are normally manufactured from rolled or formed carbon steel. Bolts and nuts are also manufactured from carbon steel, with their strength class selected according to the required mechanical performance.
The plate material grade, plate thickness, bolt grade and dimensional tolerances must be stated on the approved manufacturing drawing. Material certificates and mechanical test reports can be supplied when included in the purchase requirements.
Hot-Dip Galvanized Finish
Hot-dip galvanizing provides a protective zinc coating for outdoor utility and telecommunications applications. The required galvanizing process, coating thickness, coating mass, appearance and test method must be specified in the quotation or purchase order.
ASTM A153/A153M is commonly specified for hot-dip zinc coatings on iron and steel hardware. ISO 1461:2022 may be referenced for applicable fabricated iron and steel components. The selected standard must be confirmed according to the product design and customer specification.
Product Selection
The following factors should be checked before selecting a three-bolt guy wire clamp:
- Guy-strand nominal diameter
- Strand construction and material
- Required clamp length and plate width
- Bolt diameter and bolt strength class
- Required mechanical slip or holding performance
- Guy-wire termination arrangement
- Environmental and corrosion conditions
- Applicable utility drawing or project specification
The clamp groove must match the actual strand diameter. A clamp that is too large may not develop sufficient gripping force, while an undersized clamp may damage the strand or prevent correct plate seating.
Installation Guidance
- Confirm that the clamp model matches the guy-strand diameter and construction.
- Inspect the plates, bolts, nuts and galvanized coating before installation.
- Position the strand correctly within the straight grooves of both plates.
- Install all three bolts in the orientation shown on the approved assembly drawing.
- Tighten the nuts gradually and alternately to distribute the clamping force.
- Apply the specified installation torque using a calibrated torque wrench when required.
- Confirm that the plates are seated evenly and that the strand is not pinched against a sharp edge.
- Apply the initial design load and recheck the bolt tightness when required by the installation procedure.
- Inspect the assembly periodically for loose fasteners, corrosion, deformation or strand movement.
Installation must be performed by qualified personnel according to the approved pole-line drawing and local safety requirements.
Quality Inspection
- Raw-material verification
- Clamp length, width and plate-thickness inspection
- Groove profile and strand-fit inspection
- Bolt diameter, thread and nut-fit inspection
- Visual inspection for cracks, burrs and sharp edges
- Hot-dip galvanized coating appearance and thickness inspection
- Assembly and dimensional inspection
- Slip, holding-strength or mechanical failure testing when specified
- Marking, quantity and packaging inspection
Reference Standards
- ASTM A153/A153M – Zinc coating by the hot-dip process on iron and steel hardware
- ISO 1461:2022 – Hot-dip galvanized coatings on fabricated iron and steel articles
- Applicable utility pole-line drawings and technical specifications
- Customer-approved material, dimensional and mechanical test requirements
Reference to a standard does not constitute certification. Compliance must be supported by inspection or test documents for the exact product model supplied.
Ordering Information
Please provide the following information when requesting a quotation:
- Guy-strand diameter and strand construction
- Required clamp length and plate width
- Plate thickness and steel grade
- Bolt diameter, length and strength class
- Required hot-dip galvanized coating standard
- Required mechanical holding or slip performance
- Applicable drawing or utility specification
- Required material and test certificates
- Order quantity, marking and packaging requirements
Frequently Asked Questions
What is a three-bolt guy clamp used for?
It is used to grip galvanized steel guy strand in utility-pole and telecommunications-pole guying assemblies. Depending on the approved design, it may form a loop-type guy dead end or secure a strand termination.
Can it be used as a suspension clamp?
No. A standard three-bolt guy clamp should not be used as a suspension clamp unless the exact model has been specifically designed, tested and approved for that purpose.
Can it connect an electrical conductor?
No. This product creates a mechanical connection for steel guy strand. It is not designed as an electrical conductor connector or current-carrying parallel-groove clamp.
Can one clamp fit every guy-wire diameter?
No. The groove dimensions, plate length and bolt size must match the specified guy-strand diameter and required mechanical performance.
Are the bolts and nuts included?
The product is normally supplied as an assembled set with two plates and three bolt assemblies. The final packing list should confirm the exact supply scope.
What mechanical load can the clamp withstand?
The holding strength and failure load depend on the clamp dimensions, material, bolt grade, strand size and installation torque. A value should only be published when supported by a test report for the exact model.
