A load shackle or load pin measures the force at the point where the load hangs: in the shackle or in the pin of a block, sheave or hinge. We calibrate them in tension up to 500 kN, together with the wireless or cabled readout you use in the field.
Load shackles and load pins are found in lifting and hoisting, on offshore installations, in mooring systems and in winches and cranes. They monitor whether a load stays within the working load limit, record forces during a lifting operation or control an overload protection system. Because safety decisions often depend on them, clients and inspection bodies require a valid calibration certificate.
A load shackle measures correctly when the force is introduced in the same way as in use: through the bow and the pin, in the longitudinal direction. A load pin is even more sensitive to mounting, because the pin measures the force through shear between the bearing points. We therefore calibrate with suitable fixtures, such as pins, eyes or clevises that match the dimensions of your instrument.
If a load pin does not fit in our standard set-up, we discuss in advance whether an adapter is needed.
Many load shackles work with a wireless handheld or a receiver in the crane cab. Send it along, including any antennas and chargers. We then calibrate the measurement as the operator sees it. Check beforehand that the batteries are full; a flat battery can disturb the reading and delay the calibration.
With load shackles, three terms are easily confused:
We calibrate across the measuring range, up to a maximum of 500 kN. A shackle is therefore never loaded above its working load limit during calibration. In the quote basket, select the range that matches the working load limit or measuring range of your shackle.
If there is a marking on the pin indicating the measuring direction, leave it intact. We load the pin in the same direction as in your application.
Select the measuring range of your load shackle or load pin. We calibrate these instruments in tension.
Price on request · state make, type and requirements (display, number of steps, class) in the remarks of your request.
We calibrate in tension up to 500 kN, approximately 51 t. If your shackle has a higher working load limit, please contact us to discuss which part of the range we can cover.
No. We calibrate the force measurement. The inspection of the shackle or pin as a lifting accessory, for example for cracks and deformation, is a separate inspection. We do, however, report visible damage before we start measuring.
Annually is customary, and immediately after an overload or shock load. Your client or inspection body may require a shorter interval.
Yes. Add them as separate lines in the quote basket or state the quantity. We calibrate each shackle with its own readout, so that each one receives its own certificate.
Book your calibration online via the customer portal or request a quote. We collect your force measuring instruments and calibrate them on our tensile and compression benches in Elspeet.