Features

There are several options for bolt design. If a joint suffers from vibrations, a prevailing torque feature could be added to avoid self-loosening.
A painted weld nut might cause cross threading due to weld splatters or too much paint remaining in the nut thread. In most cases, there is a feature that will help the joint overcome these obstacles.

“Patch” is the common word for pre-applied, dry-to-touch thread features.
The three most used categories are:

  • Thread Locking
  • Thread sealant
  • Lubrication
Screw with patch

Thread Locking


Thread Locking


Prevailing torque feature.
Nylon patch creates friction due to radial force

 


Thread sealant / Locking fluid


Locking fluid
Micro-encapsulated two-component glue. The micro-capsules crack and let out the curing agent when the screw is fastened.

Thread sealant


Thread sealant / Locking fluid


Looks like locking fluid but lacks the curing agent. Fills the void between mating threads. Lubricating at the assembly, easy to loosen.

Lubrication


Lubrication


“Anti-seize.” Prevent seizure at disassembly. Universal in a host application, such as exhaust manifolds.

Wax to lower friction locally. For example the thread forming lead threads of a Taptite.