Thread sealant

Sealing of threaded and bolted joints

Threaded and bolted joints may require different sealing methods depending on the joint design, operating temperature, pressure, and medium. The sealing element can be applied directly to the thread or at the contact surface of the bolted joint.

For sealing threads, we supply PTFE sealing tapes and GTS graphite sealing paste. For sealing bolted joints, USIT bolt sealing is intended, which consists of a metal washer with a vulcanized elastomer sealing.

Methods of sealing threaded and bolted joints

• Bolt sealing – metal washers with vulcanized elastomer sealing designed for sealing bolted joints. They are available in both metric and imperial sizes and in various material designs.
• GTS – non-hardening graphite sealing paste for threaded joints with lubricating and anti-seizing properties. It is particularly suitable for smaller diameter threads with narrow tolerances and applications at higher temperatures. It can be used at temperatures up to 635 °C and with a permanent medium pressure of up to 52 MPa.
• Teflon sealing tape for threads – used for sealing threaded joints. The low friction coefficient of PTFE facilitates assembly. The offered tapes are designed for operating temperatures from −200 to +260 °C.

Related topics

The choice of sealing method is also related to the design and assembly of the bolted joint. More information can be found in the sections Torque values and Seizing of bolts.