Trojan Special Fasteners Ltd routinely manufactures nylon insert nuts to customer's requirements in multiple material and finish combinations. Nylon insert nuts are typically hexagon nuts with a polyamide (usually Nylon 66) insert.
The non-metallic ring is placed on one of the nut and as it's inner diameter is slightly smaller than the major diameter of the screw, it elastically deforms over the threads of the screw. This means that the non-metallic ring applies a compressive force against the screw which means that the nut doesn't loosen with vibration and also cushions against vibration as well.
These kind of nuts are also known as aircraft lock nuts, elastic lock nuts, elastic stop nuts, nyloc nuts, nylock nuts and nylon insert stop nuts. These are reusable (up to a limited number of time) because the nylon insert will return to its original shape. Nylon insert nuts are a form of prevailing torque nut because they have a mechanism that creates frictional interference between threads of mating components. This also means that application has to be with a wrench or spanner because the nylon ring creates increased torque.
In addition to standard preferred sizes, we also manufacture non preferred and non standard or special thread and nut forms and sizes.
Typical nuts can be used up until 120 degrees Celsius, but certain materials are available (on request) which can be used in nuts for higher temperatures, although we would recommend an all-metal prevailing torque type nut for high temperature use.