What does the Hi-Lok collar runner adjust to during installation?

The Hi-Lok collar runner is specifically designed to adjust the amount of torque applied during the installation of a Hi-Lok fastener. The collar runner's primary function is to ensure that the correct amount of torque is applied to the collar, which is crucial for achieving the proper clamping force and ensuring the fastener is securely fastened without damaging the components being joined.

Proper torque application is vital in aerospace assembly, as it can affect the integrity and reliability of the assembly. By adjusting the collar runner, mechanics can ensure that the fastener is installed correctly and meets the necessary engineering and safety specifications. This is especially important in aerospace applications where even minor deficiencies in assembly can have serious implications.

In contrast, the other options do not pertain directly to the primary function of the collar runner. The length of the collar, depth of the hole, and type of fastener used are important considerations in fastener installation but are not adjustments made using the collar runner.