Circular Connectors
For sixty years, the HCC Industries family of companies has been providing the technological know-how to meet the unique requirements of the defense and aerospace industries, as well as those customers in other industries using circular connectors in their applications.

NEW from Ametek SCP, a range of Rugged Gigabit Ethernet Connectors. Designed for use in very harsh environments and available in D38999 and MIL-C-24231 shell configurations. Certified by ETL to TIA/EIA 568 CAT 5E and CAT 6. PATENT PENDING.
Click here to contact us for more information and a copy of our data sheet.HCC circular connectors conform to the design and performance requirements of:
| Part / Series Number | Military Qualification | Detailed File Links | HCC Facility |
MIL-DTL-38999![]() ![]() ![]() |
QPL | 38999 (Sealtron) | SI (QPL), HSC (QPL), GSP |
MIL-DTL-83723![]() |
QPL | 83723 (Sealtron) | SI (QPL), HSC (QPL), GSP |
MIL-DTL-26482 |
QPL | 26482 (Sealtron) | SI(QPL), HSC (QPL), GSP(QPL) |
MIL-C-81703![]() |
81703 (Sealtron) | SI, HSC | |
| MIL-C-25955 | QPL | 25955 (Sealtron) | SI (QPL), HSC |
MIL-DTL-26500 |
QPL | 26500 (Sealtron) | SI (QPL), HSC(QPL), GSP |
ESC 10 & 11 YE |
Qualified with Society of British Aerospace Companies (SBAC) | esc10ye (Sealtron) | SI |
EN2997 |
Qualified to the ASD specification | EN2997 EN2997Y(E) Qualified Product |
SI |
| Additional Series MIL-C-19572 ![]() MIL-C-22539 MIL-C-81511 ![]() NAS-1599 ![]() MIL-C-24217 MIL-C-22249 MIL-DTL-5015 ![]() |
Commercial Equivalent | MIL-C-19572 MIL-C-22539 MIL-C-81511 NAS-1599 MIL-C-24217 MIL-C-22249 5015 (Sealtron) |
SI, HSC, GSP |
Click here for additional general specifications about the various connector mil spec.
HCC also offers coaxial connectors that meet the mechanical interface requirements of:
- MIL-C-21367
- MIL-C-39012
- MIL-C-24231
Photos: Custom Connector Examples





















HCC Industries Corporate | tel: 626.443.8933 | 4232 Temple City Blvd. Rosemead, CA 91770