About Bostec Engineering


1311 Hermosa Avenue, Hermosa Beach, California 90254 USA



PO Box 3472
Palos Verdes Peninsula,
California 90274 USA

Tom Kristy, CEO

See Tom’s blog “Both Sides of the Seal” at:



©1991-2024 Bostec Engineering, Inc. H-Seals® and H-Seal® products are covered under U.S. Patent numbers 5,433,454, 5,445,393 and other patents that are pending. H-Seal® & HiRim® are trademarks of Bostec Engineering, Inc.   All rights reserved.

Bostec designs, develops and manufactures flanges and precision metals seals for UHV applications including particle accelerators, beam lines, pulsed power, fusion, outer space, oil field and SEMI. Our seals are based on patented or proprietary technologies developed by Bostec and entirely manufactured by Bostec in our facilities in the US.

Please contact us if you have special needs not covered by our catalog parts. We are always ready to work with you to address your most challenging UHV projects.

We specialize in solving the most complex sealing problems. Our method is to study the situation on-site, determine an appropriate solution based on environmental conditions, temperature cycling, mating materials, comparative CTEs and so forth. Prototypes, mock assemblies and force tests are conducted in-house to verify designs. That generally leads to production of a small number of prototypes which are then laboratory and field tested for final iterations. Production volumes are then manufactured.

  • Founded 1992
  • Manufacturing: Los Angeles / Las Vegas, Nevada
  • EU subsidiary: Bostec Engineering, Ltd., Dublin, Ireland
  • Design and engineering of large scale, complex UHV beam lines and manufacturing of the flanges and metal seals as a matched set.
  • Particle accelerators
  • Nuclear fusion
  • Outer space
  • Semiconductors
  • Oil exploration