Hermetic Seal

What Hermetic Seal does

Hermetic Seal Corporation, founded in 1945 and headquartered in Rosemead, California, is a custom manufacturer of glass-to-metal sealed (GTMS) hermetic interconnect products serving aerospace, defense, space, energy, and medical device OEMs. The company operates from a 50,000 sq ft vertically integrated facility that spans proprietary glass formulation, metallization, assembly, and final qualification testing, and it maintains AS9100D, ISO 9001:2015, and Nadcap certifications necessary for flight and life-safety hardware. Its portfolio includes the Sealtron and AlumiSeal™ sub-brands and is anchored by patents such as US6851962 (hermetic connector) and US9270051 (wet mate connector), with a proprietary library exceeding 100 glass types supporting customer-specific thermal, pressure, and chemical compatibility requirements.

The company is a wholly-owned subsidiary of AMETEK Inc. (NYSE: AME), operating within the parent's Engineered Interconnect and Packaging (EIP) business unit, and benefits from sustained parent-level recognition including AMETEK Varet Sustainability Awards in 2023 and 2024. Revenue is not separately disclosed by AMETEK. Named flagship programs include NASA Artemis II crewed lunar mission connectors delivered in 2026, and the company has begun targeting eVTOL urban air mobility and extreme-temperature applications as adjacent growth verticals.

Go-to-market is direct enterprise selling driven by customer RFQ processes for low-volume, high-mix custom designs, supplemented by technical white papers and an active 2026 trade-show calendar spanning AUSA, Space Tech Expo Europe (Bremen), Space Expo Bengaluru, and AEDEX New Delhi. Pricing is contract-based and qualification-gated rather than list-priced, and customer churn is structurally low because glass-to-metal sealed connectors are qualified into mission-critical systems where re-qualification of an alternate supplier imposes years of program risk on the OEM.

Name

Hermetic Seal

Legal name

Hermetic Seal Corporation

Website

https://hermeticseal.com

Company type

Private

Founded year

1945

Operating status

Operating

Headcount range

11–50 employees

Short description

Hermetic Seal Corporation is a Rosemead, California-based custom manufacturer of glass-to-metal sealed hermetic interconnect products serving aerospace, defense, space, energy, and medical device OEMs, operating as a wholly-owned subsidiary of AMETEK Inc. within its Engineered Interconnect and Packaging division.

Ownership category

akta.pro rank

Product category

Hermetic Electrical Interconnects

NAICS

Gasket, Packing, and Sealing Device Manufacturing (339991), Aerospace Product and Parts Manufacturing (33641)

SIC

Search, Detection, Navagation, Guidance, Aeronautical Sys (3812), Gaskets, Packg & Sealg Devices & Rubber & Plastics Hose (3050)

akta.pro primary industry

Ruggedized/Harsh-Environment Electronics Manufacturing (IP-rated, shock/vibration, wide-temp) (IMAGAGAF)

akta.pro secondary industry

Seals, Gaskets & Fluid Connectors (O-rings, packings, rotary seals, quick couplers) (IMAHAGAI)

Keywords

• Hermetic connectors
• Glass-to-metal sealing
• MIL-SPEC interconnects
• Subsea connectors
• Aerospace connectors

Headquarters

HQ city

Rosemead

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Custom and Standard Hermetic Interconnect Products: Manufactures and sells custom and standard glass-to-metal sealed interconnect products including custom hermetic connectors, subsea connectors, hermetic terminals, end seals, and MIL-SPEC circular and rectangular connectors. Products are sold directly to aerospace, defense, space, energy, and medical device OEMs. Revenue is generated through project-based orders and recurring OEM supply contracts. Given the custom engineering nature of the products, orders are secured through a formal RFQ process.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels6 records

Core offering

Hermetic Seal designs and manufactures glass-to-metal sealed (GTMS) hermetic interconnect products for harsh and extreme environments, including custom hermetic connectors, MIL-SPEC circular and rectangular connectors, hermetic terminals, end seals, subsea/wet-mate connectors, and transistor outlines. Products are sold directly to aerospace, defense, space, energy, and medical device OEMs worldwide. The company operates a 50,000 sq ft vertically integrated manufacturing facility in Rosemead, California, certified to AS9100D and Nadcap Chemical Processing standards.

Product overview

Hermetic Seal is a custom hermetic connector manufacturer specializing in glass-to-metal sealed interconnect products for harsh and extreme environments. The company offers a comprehensive portfolio including Custom Hermetic Interconnects (Custom Hermetic Connector Capabilities, Extreme Temperature Hermetic Connectors, Aluminum AlumiSeal Connectors, Micro D and D Subminiature Connectors), Subsea Connectors and Penetrators (Subsea Penetrators, Dry Mate Connectors, Wet Mate Connectors, Pressure Balanced Oil Filled), Hermetic Terminals and End Seals, and MIL-SPEC Hermetic Circular and Rectangular Connectors (MIL-DTL-38999, MIL-DTL-26482, MIL-DTL-83723, MIL-DTL-26500, MIL-DTL-24308, MIL-DTL-28748, MIL-DTL-83513). Products serve aerospace, defense, space, energy, and medical device industries with solutions engineered for extreme temperatures, high pressure, and subsea applications.

Differentiator

Problem solved

Functional benefit

Brands

• Sealtron: Brand under Hermetic Seal offering hermetically sealed connectors including Series 8500 and Series 8600 MIL-C-26500 connectors.
• AlumiSeal™

Products and services

• Custom Hermetic Connector Capabilities Custom engineered high-vibration hermetic connectors using precision glass-to-metal sealing for harsh environment applications across aerospace, defense, space, energy, and medical markets.
• Extreme Temperature Hermetic Connectors Hermetic connectors engineered to operate across extreme temperature ranges from -197°C to +440°C, using precision glass-to-metal sealing to create airtight, mechanically robust interfaces that resist thermal shock, pressure differentials, and corrosive media.
• Aluminum (AlumiSeal™) Connectors Lightweight, high-power aluminum hermetic connectors with glass-to-metal seals designed for demanding conditions where weight reduction matters.
• Micro D and D Subminiature Connectors High-density interconnects in a miniature footprint maintaining leaktight integrity under extreme conditions for space-constrained systems.
• Subsea Connectors and Penetrators Engineered for 25-year performance in 3,000 meters of water, including subsea penetrators, dry-mate connectors, wet-mate connectors, and pressure balanced oil filled (PBOF) products for subsea energy and HPHT oilfield electrification applications.
• Hermetic Terminals and End Seals Glass-to-metal sealed terminals and end seals designed for mission-critical reliability, including battery capacitor and end seals and hermetic single seals.
• MIL-DTL-38999 Hermetic Circular Connectors High-density hermetic circular connectors designed to be environmentally resistant, rugged, and to provide critical connections for aerospace and defense applications.
• MIL-DTL-26482 Hermetic Circular Connectors Versatile, high-performance hermetic circular connectors offered in multiple configurations supporting a wide range of demanding applications.
• MIL-DTL-83723 Hermetic Circular Connectors Series 6600 and 6700 connectors designed to meet or exceed MIL-DTL-83723 military specifications for aerospace, defense, and industrial applications.
• MIL-DTL-26500 Hermetic Circular Connectors (Sealtron Series 8500/8600) Series 8500 (threaded coupling) and Series 8600 (bayonet coupling) hermetically sealed connectors conforming to MIL-DTL-26500 standards, marketed under the Sealtron brand.
• MIL-DTL-24308 Hermetic D Subminiature Connectors HSC Series 50000 commercial equivalents to MIL-DTL-24308, designed for high-reliability applications in aerospace, defense, and high-vibration industrial settings with leak rates less than 1×10⁻⁶ cc/sec Helium.
• MIL-DTL-28748 Rack & Panel Connectors Series 5000 rack & panel receptacles designed for rugged rack & panel applications with high-density contact arrangements and jack screw center coupling.
• MIL-DTL-83513 Hermetically Sealed Rectangular Connectors Microminiature rectangular connectors meeting MIL-DTL-83513 specifications with high-density contact arrangements and rugged construction for space-constrained systems.

Quantifiable outcome

• Leak rates as low as 1×10⁻¹¹ cc/sec helium at 1 atm differential pressure
• +4 more outcomes

Named customers1 record

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• AMETEK Engineered Interconnect and Packaging (EIP)coreOthersHermetic Seal is a business unit of AMETEK Engineered Interconnect and Packaging (EIP), which is a business unit of AMETEK, Inc. AMETEK EIP designs and manufactures high-performance interconnect and packaging products serving medical, aerospace, defense, energy, and high-performance electronics markets. Hermetic Seal operates under the AMETEK EIP umbrella, sharing capabilities, certifications (AS9100D, Nadcap), and sustainability initiatives.

Scale indicators4 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• Radiall: French aerospace and defense interconnect specialist offering hermetic connectors, RF/microwave, and fiber optic solutions. Directly comparable given shared aerospace/defense customer base and overlapping MIL-SPEC harsh-environment connector portfolio.
• Detoronics (Amphenol): Specialty hermetic connector manufacturer now part of Amphenol, focused on glass-to-metal sealed hermetic circular and rectangular connectors for aerospace, defense, and medical applications. Closest direct peer given overlapping glass-to-metal sealed hermetic connector portfolio and shared customer base.
• Eaton (Souriau): Through its Souriau division, Eaton offers hermetic connectors specifically designed for aerospace, defense, and oil & gas subsea applications. Directly comparable niche player with overlapping MIL-DTL hermetic circular connector portfolio and similar harsh-environment engineering focus.
• Smiths Interconnect: UK-based division of Smiths Group specializing in high-reliability interconnect solutions for aerospace, defense, space, and medical markets, including hermetic connectors. Directly comparable given similar customer verticals, harsh-environment product focus, and aerospace/defense MIL-SPEC positioning.
• Amphenol: Global connector giant with significant aerospace, defense, and harsh-environment connector offerings, including hermetic connector lines acquired through Detoronics and Aero Electric. Most direct peer given overlapping MIL-SPEC circular/rectangular hermetic connector portfolios serving the same aerospace, defense, and space OEM customers.
• Glenair: Privately held specialist in military and aerospace harsh-environment interconnect solutions, including hermetic connectors for mission-critical applications. Highly comparable given similar target customer base (MIL-SPEC aerospace/defense OEMs) and overlapping harsh-environment product positioning.
• Carlisle Interconnect Technologies: Specialist in wire, cable, and connector products for aerospace and defense markets, with overlapping MIL-SPEC connector offerings and shared customer base. Andy Sleeman (Director Strategic Accounts Defense at Hermetic Seal) previously worked at Carlisle Interconnect Technologies, illustrating direct competitive and customer overlap.

Others

• SCHOTT: German specialty glass and glass-to-metal sealing technology company with hermetic seal product lines serving aerospace, defense, and electronics. Adjacent competitor in glass-to-metal sealing technology rather than finished connector assemblies, with overlapping R&D in glass formulations for harsh environments.

Broad incumbents

• ITT Inc. Diversified manufacturer whose ITT Cannon subsidiary supplies aerospace, defense, and industrial connectors, including hermetic lines for harsh environments. Operates broadly across multiple industrial markets, with connector offerings competing directly with Hermetic Seal in MIL-SPEC aerospace/defense categories.
• TE Connectivity: Broad-line connector and sensor manufacturer with a substantial aerospace, defense, and marine business (including hermetic offerings) but serving many other markets (automotive, industrial, telecom). Competes in the same MIL-SPEC hermetic connector categories but as part of a much wider portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCAJszE5NOZR3yfDhtWyn0QA
• Facebookfacebook.com/AMETEKInterconnect
• LinkedInlinkedin.com/company/ametekinterconnect
• Xx.com/AMETEK_EIP

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Hermetic Seal