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Adapter University: Tompkins Products Information

Product Definitions

Adapters and Fittings
Here's a quick course that will assist you in making the right decisions about the hydraulic parts you need. Visit our product definitions about fittings and adapters to learn more.

Materials
Identifying the material is essential to optimal performance. Read our product definitions regarding materials.

Product Categories

Tompkins features a wide variety of product categories and brands to serve your hydraulic adapter and fluid power product needs. View product categories.

Thread Information

  • Thread Outside Diameter Chart: Download (27kb)
  • Thread Size Chart: Download (62kb)

Metric Information

  • BSPP/BSPT Thread Identification Chart: Download (27kb)
  • Metric compression fittings are available in other sizes and configurations in steel and stainless steel. Please call customer service at 1-800-255-1008 for additional information.

Why Wet Torque?

Due to differences in plating types and thicknesses, materials and thread quality of components, the coefficient of friction can vary widely on any given assembly. Lubrication not only produces a more consistent coefficient of friction, it increases clamping force on sealing area with less torque on the threads.

Over-tightening causes threads to yield, deform and therefore lose the ability to maintain an adequate load or clamping force on the seating area. Extended operation and severe conditions cause further yielding which promotes possibility of leaks. Improper installation is the primary cause of leaks in hydraulic connections.

Tompkins firmly recommends the application of the wet-torque method during installation. When you choose not to wet-torque, consistency and quality are compromised for the sake of convenience.