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Topic is connector backshells, what the hell is a backshell?


backshell ‎(plural backshells) (mechanical) Part of an electrical conductor or other electrical device, such as a cable clamp or adapter, that is threaded onto the rear connector accessory threads of plug or receptacle connectors to make up the total connector assembly.

The backshell protects in many ways. If it includes a grometted cable entry it can prevent ingress of dirt, moisture and liquids. This environmental seal can be maintained provided that all grommet entries are either populated with a wire or cable, or are plugged. Maintaining the seal also depends on ensuring that the cables are never bent to an excessive angle, typically not more than 130d, away from the connector axis. Using a backshell with strain relief or a cable clamp can protect from excessive cable flexing and bending, as well as removing loading from the connector pin solder or crimp joints. When specifying backshells, 45d, 90d or straight through cable entries can be chosen.

Sometimes it’s necessary to locate extra components, such as a filter network, close to a connector. In such cases, extended backshells can be ordered to accommodate this extra space requirement. Both standard and extended

Getting RAD with Amphenol Radsok power connectors


It sounds RADical and POWERfull doesn’t it?

What is this RADSOK technology anyway?

Well, in our lesson today…let’s explore why so many new applications pertain to this relatively new technology and the corresponding new products form Amphenol:

RADSOK® technology is based upon a stamped and formed flat grid, uniquely twisted into a hyperbolic geometry to provide robust, high density contact to the mating pin contact. Most pin and socket technologies rely on spring (beam element) properties of the contact elements, which tend to weaken over time. Unlike most other pin and socket solutions, the RADSOK also utilizes the tensile strength properties of the flat, high conductivity alloy grid. This provides the high normal forces required for conductivity while also providing a large conductive surface area. Correspondingly low voltage drop and low temperature rise are also achieved while maintaining low insertion forces.

Good design applications include high voltage high current designs in the industrial & energy/utility industries.  I have see it used in Construction and Induction Heating projects that require robust and repeatable insertions with good conductivity and use for users over multiple matings.

Amphenol has pioneered hyperbolic contact design and remains a leader in the field.

When someone asks you ab0ut RADSOK in the future, you now know that it is not a PUNK BAND, but rather a cool technology used by hundreds of design engineers to meet and exceed power connector applications. 😉

Be well,

Professor Gizmo…


Contacts, Contacts, Contacts…


Kind of like “Marsha, Marsha, Marsha” from the 70’s SITCOM the Brady Bunch. These highly attractive metal (some precious) pins & sockets have an appeal all their own. From the tiniest wire barrel size of 28 to thick high current custom contacts, they can come in in many different shapes, sizes, & styles; such as Crimp, Printed Circuit Tail, Thermocouple, Coaxial, Solder Cup & Wire Wrap, Twinax & Quadrax Contacts.

They have a multitude of materials, finishes, sizes, gender types, and applications and those contacts are like the arms legs & feet of an electrical connection, allowing it to move power and signals at speeds nearing the speed of light.

So, let’s explore why so mnay options for contacts in electronic connectors today and determine how best to choose what is RIGHT one for YOU!

Part numbering systems vary and Mil Spec parameters with their associated numbers can help.

A good resource for how to cross reference MIl Specs to commercial part numbers is provided by Tri-Star, a division of Carlisle Interconnect and a good source for high quality contacts; Some key facts about Tri-Star include: see <>

  • currently supplying over 90% of the world’s leading aerospace, avionics and electronics OEM’s is…
  • the first to be fully compliant with the stringent requirements of Mil-C-39029
  • QPL approved for almost 400 different contacts (nearly double the number of any other contact manufacturer)
  • ISO9001/AS9100C third party qualified and registered
  • cost effective manufacturing through custom designed automation

Lastly, Contacts are the critical limbs enabling current and electricity to reach their next and or final destination, so choose wisely.

Till next time!

Prof G….

Learning about Electronic Connectors



And in today’s session we will review a top connector style on the market today involved in over half of all current military, aerospace, and defense designs. So, quiz pop quiz;

1. What connector has “scoop-proof” design features allowing for better blind mating (i.e. lack of vision aided coupling) and reduced pin damage.

2. An improved “one coupling” thread system giving better durability and shock resistance.

3. Backward compatability to previous Series of connector designs

4.  Firewall and Moisture ingress improvements allowing for safer and stronger connectivity of plug & socket.

5. And a Universal tool for easy insertion and removal of pins.


38999 Series III, no wonder it has attained over 30% market share of all circular conenctors in production today!  It is simply a BETTER MOUSETRAP.


Welcome to Professor GIZMO’s BLOG


Hello, and let me introduce myself to you, I am Professor GIZMO, and I plan on letting you all learn from (and teach) me everything I need to know about electronic connectors.

To start today’s session, I am posting a picture of myself drawn by some random artist on the web (copyright not protected, but in the spirit of education and all, how about a pass) that looks a bit like I might like to look if I was nicer & smarter.

Seriously, here is a pop quiz…what is the difference between a plug connector and a socket connector?

Wait on it….

Yes, a socket does not have its electrical contacts exposed vs a plug. The socket carries the live current and electricity that the plug will go into thus completing the circuit and sending power & signal down a wire.

And you can only mate a male plug to a female socket for reasons we all know.

OK then, I guess we can stop now for today’s lesson has already upset someone out there but hopefully educated a few more.

Till next time we connect,

Professor GIZMO…