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
AUTHORIZED STOCKING DISTRIBUTORS
In an effort to service our customers most effectively, we have partnered with BTC Electronic Components as an authorized stocking distributor. BTC maintains a multi-million dollar inventory of standard HCC products including QPL and similar non-QPL circular connectors, D-Subs and Rack and Panel Connectors; and has part number cross-referencing available. BTC also stocks the key connector lines of Ametek SCP, which includes MIL-C-24231, MIL-C-24217 and the innovative Rugged Gigabit Ethernet Connector.
Please feel free to contact BTC Electronic Components directly. Most items can ship within one day from BTC.
Or you may use our RFQ form and our Customer Service team will be in contact with you as soon as possible.
Thank you.





















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