PRODUCTS > H-Seals
H-Seal® Metal Gaskets: Developed for Small Footprint UHV
Cutaway of gold H-Seal.
• Low compression force—smaller fasteners required
• Self-limiting—cannot be overtightened
• Self protecting—won’t scratch
• Robust—easy to use
• Guaranteed 1 x 10-11 leak rate
• 100% reliable—100% yield, guaranteed!
Cross section of H-Seal in gold under full compression showing self-limiting and self-centering design
Typical H-Seal application, showing assembly steps and cross section of H-Seal
Cut aways showing positive dead stop of H-Seal.
H-Seals are space-saving, easy to handle, easy to install and easy to remove. They also cannot be over-tightened. The H-Seal itself provides a positive dead-stop, or you can specify gland-to-gland mating. The gland can be used over and over with no loss of
performance.
Narrow, efficient profile of H-Seal takes 50% less space, and smaller fasteners mean smaller bolts, which also save weight and space.
Two configuration of H-Seals, gap, which forces the flanges to bottom on the seal or zero-clearance allows the flanges to bottom on each other.
Interchangeable with O-Rings
H-Seals and H-Glands are based on patented and proprietary technology developed and owned by Bostec Engineering. Purchasers of H-Seals are given a no cost license to manufacture their own H-Glands. To obtain full manufacturing specifications and dimensions, simply call or email Bostec. We will send your no cost license and H-Gland manufacturing guidelines. We will also provide free over-the-phone consulting for your machine shop on producing the H-Gland.
H-Seals are interchangeable with elastomeric O-Rings.
Download H-Seal dimensions and sizing charts in both North American and Metric dimensions.
Misalignment of up to 10% of the H-Seal OD is tolerated with no loss of performance or seal integrity.
Critical sealing surfaces on both the H-Seal and H-Gland are recessed and protected from damage.Both the flange and H-Seal can be placed on assembly tables without the knife edge or seal surface being damaged. This makes H-Seals easy to handle in production environments.
Illustration showing various designs allowing accommodation of special design needs.
Standard profile sizes from 0.300" to 32" OD. Or let
Bostec develop custom shapes to accommodate your
special requirements.
Deep-Well H-Seals are often used in horizontal installations where
extra positioning or holding assistance is needed.
End-Cap H-Seals are used as simple mechanisms for 100% positive, leak-tight closure.
Reverse H-Seals switch the knife edge to the outside. This minimizes dead volume or provides a smooth shape on the ID surface.
Most components in any modern UHV process are
precision machined to tight tolerances with highly
polished surface finishes. Your gaskets should be no
different! Precision gaskets fit properly, are 100% reliable and do not contaminate with unwanted burrs, abrasive contaminants or manufacturing debris.
Bostec H-Seals are machined on all surfaces and are completely free of burrs. Gasket faces have precise
machining grooves in an annular ring pattern to ensure the knife edge seats into the gasket.
Surfaces are less than Ra 0.6 (circular) and delivered “as-machined”—not polished or otherwise modified post machining. No abrasives are used.
Our inpection process ensures no radial scratches are visible at 10X magnification, and the gaskets are free from surface inclusions and other blemishes.
In the world of super-UHV, the cost of a single failed
gasket is 1000X the cost of the gasket itself. It makes no sense to use inferior gaskets and risk failure.
20X DN63 Copper
30X DN63 Ni 200/201 Smooth surfaces and fully swept flow path minimize trapped particles.