NU Series Non-Adjustable Wedge-Type Guy Wire Clamp
The NU series non-adjustable wedge-type guy wire clamp is a mechanical pole-line fitting used to terminate galvanized steel strand in overhead power-line guying systems. It is installed as part of the guy assembly to transfer tensile force from the pole or tower to the anchor system.
The clamp uses a wedge-locking structure to grip the steel strand. When tensile load is applied, the wedge is drawn into the clamp body to increase the holding force. Unlike the adjustable NUT series, the NU series does not provide an extended threaded section for field tension adjustment.
Key Features
- Non-adjustable wedge-type structure for guy wire termination
- Designed for galvanized steel strand used in pole and tower guying systems
- Wedge action increases the grip on the strand under tensile load
- Malleable cast-iron clamp body and wedge
- Steel U-shaped connecting member with nuts and fastening hardware
- Hot-dip galvanized ferrous components for outdoor corrosion protection
- Available in NU-1, NU-2, NU-3 and NU-4 sizes
- Dimensions, coating thickness and mechanical load can be supplied according to approved drawings
Technical Specifications
| Model | Steel Strand Section | Strand Diameter | Thread M | Dimension C | Length L | Length L1 | Nominal Failure Load | Reference Weight |
|---|---|---|---|---|---|---|---|---|
| NU-1 | 25–35 mm² | 6.6–7.8 mm | M16 | 56 mm | 210 mm | 65 mm | 45 kN | Approx. 1.92 kg |
| NU-2 | 50–70 mm² | 9.0–11.0 mm | M18 | 62 mm | 260 mm | 65 mm | 88 kN | Approx. 2.61 kg |
| NU-3 | 100–125 mm² | 13.0–14.0 mm | M22 | 74 mm | 290 mm | 85 mm | 143 kN | Approx. 4.21 kg |
| NU-4 | 135–150 mm² | 15.0–16.0 mm | M24 | 82 mm | 340 mm | 100 mm | 164 kN | Approx. 7.27 kg |
Important: The values above are representative industry dimensions for product selection. Final dimensions, tolerances, strand compatibility and mechanical ratings must be confirmed against the approved drawing, sample and project specification before ordering.
Materials and Construction
| Clamp Body | Malleable cast iron |
|---|---|
| Wedge | Malleable cast iron |
| U-Shaped Connecting Member | Carbon steel |
| Nuts and Washers | Carbon steel |
| Surface Treatment | Hot-dip galvanized |
| Optional Requirements | Customized dimensions, zinc-coating requirements, markings and packaging according to the approved specification |
Surface Treatment
Ferrous components are hot-dip galvanized to improve corrosion resistance during outdoor service. Zinc-coating thickness, coating mass, adhesion and surface condition should be confirmed according to the buyer’s applicable standard and inspection requirements.
ISO 1461, ASTM A153/A153M or GB/T 13912 inspection requirements can be specified when supported by the corresponding production process and test documentation. Compliance should not be stated on the purchase order or product page until the applicable inspection report has been confirmed.
Applications
- Utility-pole guy wire systems
- Overhead power distribution lines
- Transmission-line tower guy assemblies
- Rural electrification projects
- Distribution-network upgrades
- Telecommunication pole support systems where the approved strand and load requirements are compatible
Model Selection
Select the NU clamp according to the actual galvanized steel strand diameter, strand cross-sectional area, required mechanical load and connecting dimensions. The selected clamp must be compatible with the complete guy assembly, including the guy strand, anchor rod, thimble, stay insulator and associated connecting hardware.
For quotations, please provide the required model, steel strand diameter, strand construction, required failure load, coating standard, quantity and any approved project drawing.
Quality Inspection
- Material and dimensional verification
- Visual inspection of casting and steel components
- Thread and assembly inspection
- Zinc-coating thickness inspection when specified
- Mechanical load testing according to the approved test plan
- Marking, quantity and packaging verification before shipment
Frequently Asked Questions
What is the difference between NU and NUT guy wire clamps?
The NU series has a non-adjustable connecting structure. The NUT series uses an extended threaded U-shaped member that allows the installed guy-wire tension or connection length to be adjusted within its designed range.
Can the NU clamp be used for every steel strand size?
No. Each NU model has a specified strand-diameter range. The strand diameter and mechanical load must be checked before selecting the clamp.
Is this clamp used for electrical conductor termination?
No. This product is primarily intended for galvanized steel guy strand used to stabilize poles or towers. It should not be described as an electrical conductor tension clamp.
Can customized sizes be manufactured?
Customized dimensions, materials, coating requirements, markings and packaging can be evaluated according to the customer’s drawing, sample and order quantity.
