How To Avoid Fastener Overload

We have discussed how fastener overload impacts overall production capacity and sorted out relevant influencing factors. Where there is a problem, there is a solution. Likewise, practical measures are available to prevent fastener overload. If you would like to learn the specific procedures to avoid overload and maintain production efficiency, please read the following article, which summarizes key points to observe during fastener‑related operations to prevent overload failure.

What measures can be taken to prevent fastener overload? If you intend to drive bolts properly instead of damaging them, the following points cannot be overlooked.

Drill pilot holes: A pilot hole is a pre‑drilled hole in the base material that creates a recess for fastener installation. With a relatively small diameter, pilot holes prevent over‑tightening of fasteners or jamming between split workpieces, and help avoid significant reduction in shear capacity.

Set appropriate slip clutch parameters: The slip clutch is an adjustable collar that controls the driving torque transmitted to the bolt head. It is critical to adjust the slip clutch to match the torque required for installing the fastener. Improper torque settings will result in fastener overload. Slip clutch values for softwood differ from those for hardwood or metal. Lower torque is required for softwood applications, while higher torque settings are necessary for metal fastening.

Use self‑centering drill bits: It is difficult for manual operation to achieve millimeter‑level precision when drilling recesses for fasteners. Misaligned or off‑center holes may cause the fastener to deviate from its intended path. To avoid this issue, self‑centering drill bits are recommended for higher drilling accuracy. This prevents over‑driving and preserves the designed shear performance of fasteners.

So far, we have covered the consequences caused by fastener over‑driving and corresponding preventive solutions. In general, risks of over‑driving can be greatly reduced when bolt installation is performed by qualified technicians. Professional technical consultation is therefore recommended when necessary.