At HST, we engineer glass-to-metal seals/feedthrus in different specifications to meet varied high amperage needs. Pins for these feedthrus are made from hermetically sealable materials, such as alloy 52, stainless steel, molybdenum, copper-cored 52 alloy, and copper cored stainless steel.

Our high amperage seals are used in electric vehicles and high output batteries, as well as in several high current switching applications. Our engineers can design as well as build feedthrus to custom specifications, facilitating easy mounting.


Pin Materials Alloy 52 and Copper Cored 52 Alloy
Stainless Steel and Copper Cored Stainless Steel
Other Materials Available Upon Request
Capabilities Brazing
Glass Formulation
Glass Sealing
Resistance Welding
Insulator Materials Babal
Barium Alkali
Cabal 12 and other low silica glass
Corning 9010
Corning 9013
HST Custom Lithium Corrosion Resistant Glass
Soda Lime
Mount Type Flange Mount
Nut Mount
Threaded Mount
Current RatingDepending on center pin designed/application
Mounting Diameter0.25” to 3.0”
Plating Options Copper Plating
Electroless Ni Plating
Electrolytic Ni Plating
Hard Gold Plating
Pure Gold Plating
Silver Plating
Tin Plating
And Many Others
Industries Served Aerospace
HermeticityLess than 1 x 10^8 cc/sec helium leak rate (100% tested)
Production Capability We have the ability to handle orders from ten parts to millions of parts
We can also do sample parts
HST can help you with free hermetic seal design and development to insurance you have a reliable and robust glass to metal seal