A Complete Guide to 15 kV Tongue & Clevis

This guide is designed for power transmission and distribution engineers, EPC project managers, and procurement personnel. It systematically explains the technical parameters, selection principles, installation points, and procurement checklist for 15 kV Tongue & Clevis (metal fittings).

• Product Model: 15 kV Dead-End Suspension — Tongue & Clevis
• Rated Voltage: 15 kV
• Rated Tensile Strength: ≥ 40 kN (Nominal value, factory tested on each unit with test report)
• Material: ASTM A36 steel
• Surface Treatment: Hot-dip galvanized (compliant with ISO 1461; typical coating thickness 60–100 µm, coating certificate available)
• Dimensional Tolerance: ±0.1 mm for critical holes
• Typical Lead Time: 7–14 days for regular stock; 4–6 weeks for large/custom orders (based on final order)
• Minimum Order Quantity (MOQ): 1,000 (samples and small batches available)

Why choose this kind of hardware?

Tensile Strength and Structural Safety (Meaning of ≥40 kN)

A 40 kN rated tensile strength indicates that the component has sufficient safety margin under static loads or transient external forces (such as overloads, wind loads, and line jumps). Comparison standards: Similar distribution terminal fittings typically range from 25–60 kN, and 40 kN is a common standard in medium- and low-voltage distribution and urban grid reconstruction projects. More importantly, factory tensile testing of each component transforms “theoretical values” into “traceable measured data,” facilitating compliance verification during bidding and acceptance.

Materials and Corrosion Protection

ASTM A36 is a structural steel commonly used for load-bearing components. Combined with ISO 1461 hot-dip galvanizing, it provides long-term corrosion resistance in a variety of environments (urban, suburban, and industrial). For applications involving strong salt spray or coastal environments, the coating thickness and salt spray test report should be carefully reviewed, and thermal galvanizing or special coatings should be considered if necessary.

Dimensional Tolerance and Compatibility (±0.1 mm)

High precision in key dimensions such as hole position, spacing, and mating surfaces ensures seamless compatibility with existing rods, clevis pins, and wire hanger points, reducing on-site rework and temporary fabrication.

On-site installation and construction steps

The following provides standard installation steps for typical distribution towers/poles, along with common errors and how to avoid them. Before installation, be sure to comply with safety procedures and live work regulations (if live work is required, a professional license is required).
Standard Installation Steps (recommended order):
Inspect accessories: Confirm that the tongue, clevis, clevis pin, cotter, and washer are all present. Inspect for plating, machining defects, and markings.
Tools: Wrench, torque wrench, hammer (soft tip), protective gloves, safety glasses, and alignment tool.
Drawing Reference: Use CAD/dimensional drawings to verify on-site hanging points, spacing, and screw hole locations.
Assembling the clevis to the pole: Place the clevis on the support and insert the clevis pin. Initially secure, but do not tighten to the final torque.
Installing the tongue and conductor: Secure the conductor hanging point with one end of the tongue, ensuring that the conductor is properly seated and the insulation/jacket is intact.
Tightening and Torque: Final tightening of bolts/nuts to the recommended torque (if no recommended torque is available, use the standard torque for fasteners of the same diameter and record it).
Cotter Installation: Ensure the cotter is fully extended and secure to prevent pin slippage.
Functional Check: Visually inspect the connection and manually test it with a tensile force (if possible) to confirm that there is no looseness and that the plating is not severely scratched.
Batch Recording: Record the part batch number, production batch number, and on-site installation date for traceability.
On-site Retesting: For critical projects, conduct on-site tensile/vibration testing and generate an acceptance report.
Common Installation Errors and Avoidance Tips
Error: Neglecting to fully extend the cotter or not using a locking device → Consequence: The pin may loosen after extended operation.
Recommendation: After installation, check that the cotter extension angle is ≥ 120°.
Error: Hitting with a sledgehammer during tightening damages the plating → Recommendation: Use a soft-headed hammer and place protective pads on the contact surface.
Error: Randomly substituting Clevis pins of varying specifications on-site → Recommendation: Use only parts that match the CAD/datasheet and document replacement batches.
Error: Failure to document installation information by production batch → Recommendation: Create a simple assembly/acceptance form (including component batches).

FAQ

Q: Is this hardware suitable for high-salt coastal environments?
A: In principle, hot-dip galvanizing provides good corrosion protection in general coastal environments. However, for extreme environments (within a few meters of the coastline), a thicker coating or additional coating is recommended, and a salt spray test report (available with the inquiry) is recommended.

Q: How can I obtain the tensile test report and MTR?
A: Select the required certificate on the RFQ form, or contact sales for a copy of the report for the specified batch before placing an order.

Q: What is the sample policy?
A: We accept samples (sample and shipping costs are typically borne by the buyer). Sample delivery typically takes 7–14 days (depending on inventory and logistics).

Q: What is the minimum order quantity (MOQ)?
A: 1,000 pieces, but special arrangements can be made for samples/small batches.

Q: What is the hardware warranty period?
A: The standard warranty is 12 months against manufacturing defects (manufacturer damage or improper installation is not covered). Detailed warranty terms are provided in the contract appendix.