Delivery Checklist for Rebar Couplers and Structural Connectors Before Use

You receive a batch of couplers, and the quantity is correct. But when they are used at the site, it becomes clear that several have incomplete threads, their size does not match the rebar, or the shipment is not accompanied by any certification. These are exactly the issues that must be identified before use, not in the middle of concrete pouring.

Why Coupler Inspection Is Sensitive

A coupler is a structural safety component that can no longer be replaced after concrete pouring. Therefore, its inspection must be complete and carried out before use. The four main areas are: accompanying certification, matching the size and type, thread quality, and surface condition.

The coupler’s threads and size compatibility must be inspected before concrete pouring, because it can no longer be replaced afterward.

Step-by-Step Checklist

1. Accompanying certification: Make sure the tensile test certificate is included with the shipment and matches the size and type.
2. Matching the size and type: Match the coupler with the diameter and type of the project’s rebar (standard, reducing, compression).
3. Thread quality: Inspect the threads for cleanliness, uniformity, and the absence of damage.
4. Engagement test: Fasten several couplers onto rebar samples to ensure full engagement without looseness.
5. Surface condition: Check for severe rust or physical damage.
6. In case of discrepancies: Contact the seller before use and settlement.

Signs of a Problematic Shipment

This inspection is the most essential task before using a component that cannot be replaced after concrete pouring and on which the safety of the structure depends.

An Additional Note on the Engagement Test

Do not perform the engagement test on a sample only once for the entire shipment; if the shipment consists of several packages or different consignments, test at least one sample from each package, because quality may vary between different packages in the same order.