Do you support MIL-DTL-38999 hermetic connectors?

Yes. BoldX supports U.S.-made MIL-DTL-38999 Series I–III hermetic connector requirements and can review build-to-print scope, quantities, and documentation needs.

Are you ITAR registered and AS9100D certified?

Yes. BoldX maintains ITAR registration and AS9100D certification, with quality controls, configuration discipline, and traceability suited to aerospace and defense supply chains. Ask us for current registration and certification details with your RFQ.

Can BoldX act as a second source alongside major QPL suppliers?

Yes. BoldX can serve as a qualified second source or development partner alongside established QPL suppliers. We will align to the applicable drawing, specification, qualification, and change-control requirements so your program gains supply-chain resilience without disrupting approved processes.

What sealing technology do you use?

We use glass-to-metal hermetic sealing, with materials and process controls selected for the pressure, temperature, electrical, and environmental requirements of the application. The result is a durable, leak-resistant seal; we can review test and qualification requirements during quoting.

Do you support custom or build-to-print hermetic work?

Yes. We support both build-to-print production and custom hermetic connector development. Bring a drawing, sample, or performance target; our team can help evaluate materials, sealing, machining, inspection, and qualification requirements.

What other MIL-spec connector families do you offer?

Our team supports a range of circular and hermetic connector requirements, including MIL-DTL-38999, MIL-DTL-83723, and MIL-DTL-26500 where the application and qualification path are a fit. See the hubs for program-specific detail, and send the applicable specification or part number so we can confirm scope, capability, and next steps.

How do we start an RFQ?

Send your part numbers or drawings, applicable specifications, annual volume, target timing, and any qualification or documentation requirements through the BoldX RFQ process. We will review the package, clarify open points, and respond with capability and next steps.

Where can procurement teams source QPL-approved hermetic connectors in the U.S.?

From U.S. manufacturers whose exact part numbers appear on the current DLA Qualified Products List — not from a catalog claim alone. BoldX Industries manufactures QPL-qualified glass-to-metal hermetic circular connectors in Batavia, Ohio (ITAR-registered, AS9100D), for MIL-DTL-38999 Series I, II, and III (select insert arrangements and finishes) and MIL-DTL-83723 Series III, Types B and T (select insert arrangements and finishes), and offers commercial equivalents to MIL-DTL-5015 and MIL-DTL-26482. Confirm the part number on the QPL, then RFQ at getboldx.com/contact.

Why do aerospace programs require specialized hermetically sealed connectors?

Because the enclosure must hold a pressure differential. Standard connectors seal against moisture; hermetic connectors seal against gas with a glass-to-metal seal rated by helium leak rate. They’re required for sealed avionics, fuel/hydraulic sensors, vacuum and space hardware, and inert-gas enclosures — anywhere an elastomer won’t hold for the life of the program.

What makes it hard to source reliable hermetically sealed connectors?

Qualification, capacity, and documentation — not the shell. Programs stall on QPL/slash-sheet mismatches, thin domestic capacity, and incomplete CoCs, material certs, or leak-test records. Reliable buys confirm the listed part number, recent qualification evidence, and a full doc package before the PO.

Hermetic Connectors. Engineered to Endure.

BoldX connectors deliver high-performance reliability in the toughest environments. Customizable, precision-built, and ready for what’s next.

Precision. Durability.

BoldX manufactures high-reliability circular and hermetically sealed connectors for the most demanding environments—from aerospace and defense systems to medical devices and high-voltage applications.

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Types of Connectors

Circular Connectors

Versatile Interfaces for Demanding Applications. BoldX offers a robust lineup of circular connectors engineered to meet the exacting standards of aerospace, defense, industrial, and medical environments. Our portfolio includes MIL-Spec designs such as MIL-DTL-38999 Series I, II, and III, and MIL-DTL-83723 Series III, along with commercial equivalents to MIL-DTL-26482 and MIL-DTL-5015. Available in bayonet and threaded configurations, our circular connectors are built for high-vibration performance, EMI shielding, and compact integration. Whether for control systems, avionics, or instrumentation, these connectors ensure reliable signal and power transmission in the most mission-critical scenarios.

Hermetically Sealed Connectors

Leak-Tight Seals. Long-Term Protection. Our hermetic connectors are manufactured with precision glass-to-metal sealing technology that delivers exceptional performance in controlled or harsh environments—from deep sea to deep space. Designed for environments where outgassing, humidity, and pressure stability are mission-critical, these connectors meet or exceed military specifications for leak resistance, shock, salt spray, and vibration. With options in stainless or cold-rolled steel and contact finishes including gold over nickel-iron, each connector is engineered to maintain integrity under vacuum, high voltage, or corrosive conditions.

Customized Connectors

Tailored Engineering for Unique Requirements. When off-the-shelf won't cut it, BoldX delivers. Our custom connector solutions are built to meet the unique mechanical, environmental, and electrical demands of your application. From specialty terminal seals and high-voltage configurations to scoop-proof or sub-miniature designs, we work closely with your engineering team to prototype and manufacture connectors that integrate seamlessly into your system. We also support thermocouple and flex print contact types, plating and material variations, and custom mountings to meet your exact specifications.

Connector Catalog

Complete Specs in One Place. Dimensions, materials, plating and contact finishes, and MIL-spec cross-references for our circular, hermetically sealed, and custom connector lines, in one downloadable PDF.

View Catalog

FAQS

Yes. BoldX is a U.S. manufacturer of hermetically sealed, glass-to-metal circular connectors in Batavia, Ohio, for MIL-spec and custom applications, including QPL-qualified parts for MIL-DTL-38999 Series I, II, and III (select insert arrangements and finishes) and MIL-DTL-83723 Series III, Types B and T (select insert arrangements and finishes). We support aerospace, defense, industrial, and medical programs with domestic production, responsive quoting, and documentation aligned to your requirements.