Patent Nos. 4,019,550 and 4,126,170.
Zero Leakage At Threaded Joints
Seals Liquid Around Threads

At Bearing SurfaceVibration-proof sealing of bolt and nut joints-eliminating washers, surface preparation, packing or other measures. The tough Zytel® nylon sealing insert is mechanically encapsulated within the nut face providing the convenience of a one-piece fastener.

Here's How It Works...
During installation the insert protrusion (1) slips outwardly against the bearing surface. A completed fold effect compresses the insert (2) to seal and lock as metal-to-metal contact is achieved.

Insert Compression Products:
* 360 sealing pressure around threads and bearing surface.
* Dampens vibrations-maintains preload.

HYDRA-LOK® sealing insert is unexposed and impervious to acids and solvents. When loosened, insert regains its original shape-ready for reinstallation! HYDRA-LOK® can be manufactured in special configurations from any commercial metal. All finishes available. Metric or special threads available.

AEROSPACE...HYDRA-LOK® can be made to adhere to Specification Mil-N-85615
Our Technical Advisory Service is at your disposal without obligation, and on request, we will furnish test samples and details of industrial applications already realized.

Call 800.877.0789 for complete information.