Product Overview
Sealectro M39012/67-0004 SMB Cabled Plug Connector, Gold Plated, in the Sealectro Bag with Assembly Sheet
Condition
New old stock. The connector is photographed with its clear Sealectro poly bag, an ordinary resealable zip-lock bag whose factory label reads LOT # 1398833 229, 051-307-6704-229 REV-B, M39012/67-0004, MFR-98291, HR-11139 and AI-331 under the sealectro / BICC Electronics logo. Through the bag the gold plating on the contact pin, the threaded clamp body and the outer shell looks bright and even, with no oxidation, tarnish or handling marks visible, and the white insulator is clean. A flat Sealectro R.F. Components Division assembly instruction card fills the bag behind the parts, printed for the MIL-C-39012 series SMB and SMC cabled plug, female, Class 2, and it still carries the Mamaroneck, N.Y. 10543 address and the 914-698-5600 phone number.
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Product Overview
This is a Sealectro subminiature RF coaxial cable connector built to the MIL-C-39012 family, identified on its own factory label as M39012/67-0004 with Sealectro part number 051-307-6704-229 REV-B and lot 1398833 229. That slash sheet number is the one a buyer matches against a drawing, a wire list or a bill of materials, and it is printed on the bag rather than inferred. The photographs show a multi-piece cabled plug assembly: a small gold center contact carried in a white insulator, a hex and threaded clamp body, and a larger smooth cylindrical body with a plain hex flat and a protruding pin, all gold over copper. The enclosed Sealectro assembly sheet covers the MIL-C-39012 series SMB and SMC cabled plug, female, Class 2, and its drawing calls out .025 I.D., .088 C'BORE I.D., 15/64 hex, 7/32 hex, 1/4 dia and 10-32 UNF-2A / UNF-2B threads across the variants it documents. Secondary codes on the label, MFR-98291, HR-11139 and AI-331, are useful cross references when tracing a legacy military or aerospace bill of materials.
Key Features
- Military identity on the label: M39012/67-0004
- Sealectro part number: 051-307-6704-229 REV-B
- Lot number: 1398833 229
- Manufacturer code on the label: MFR-98291
- Additional label codes: HR-11139 and AI-331
- Type per the enclosed sheet: MIL-C-39012 series SMB and SMC cabled plug, female, Class 2
- Construction: gold over copper, multi-piece cable clamp style assembly with white insulator
- Packaging: resealable Sealectro poly bag with the printed assembly instruction card inside
- Brand marking: sealectro / BICC Electronics, R.F. Components Division, Mamaroneck, N.Y.
- Impedance, frequency rating and cable group: Not confirmed - verify against the M39012/67 slash sheet before use
Applications
- Avionics or ground support technician repairing a legacy harness whose drawing calls out M39012/67-0004 by exact number
- Radar, telemetry or instrumentation rebuilder terminating a subminiature coax run that ends in an SMB interface
- Lab engineer assembling a documented test jumper where a traceable mil-spec connector with a lot number is required
- Restorer or collector keeping a period-correct Sealectro assembly intact, instruction sheet and all
Frequently Asked Questions
Is this the same M39012/67-0004 my print calls out?
The factory label on the bag reads M39012/67-0004 directly, alongside Sealectro 051-307-6704-229 REV-B. Match the slash sheet dash number to your print, then confirm the cable group your build uses before you crimp anything.
Does the assembly instruction sheet come with it?
The sheet is visible inside the bag in every photograph. It is the Sealectro R.F. Components Division sheet for the MIL-C-39012 series SMB and SMC cabled plug, female, Class 2, with the dimensional callouts and the exploded assembly order printed on it.
What cable is it sized for?
Not confirmed. The sheet documents several cabled plug variants at once, so the cable group and clamp dimensions for this specific dash number should be checked against the M39012/67 slash sheet or your original drawing before use.
Has the gold plating held up?
What the camera shows through the bag is bright, even gold with no tarnish, greening or scuffing on the contact, the clamp body or the third piece. Condition is recorded as New. The bag is the resealable zip-lock type, so it cannot prove one way or the other whether it has ever been opened - judge the plating from the photographs.
Why buy one or two of these instead of a bulk lot somewhere else?
A connector repair usually needs one plug, sometimes two, not a bag of fifty. PartsMine sells the exact quantity you need. Shipping is $8 flat rate and free over $28, and orders go out same or next business day from Idaho, so a single mil-spec connector still lands on your bench quickly and cheaply.
Bagged with its Mamaroneck assembly card still tucked in behind the parts, waiting on the one person who actually needs a Class 2 SMB plug. If the print on your bench calls out M39012/67-0004, your search just ended.
