a division of Milestone Technologies, Inc.
"Everything for the Morse Enthusiast!"

Home Page What's New Search Contact Us Order Info

PLA Keys
Chinese Military!

D117/K4 and K5 Heavy Keys    K7 Training key



D117/K4 Heavy Key
Click the thumbnail images above to view in full size!

Variously known as the D-117, the K4, or just the "Chinese Army Key" these heavy duty straight keys were made for the Chinese Peoples' Liberation Army (PLA).  The Chinese phrase "changshu dianxun qichai chang" translates as "Changshu Telecommunication Equipment Factory."

In 2000, Morse Express obtained remaining stocks which were purchased direct from the PLA as surplus. They were mostly in factory new condition, with some showing a bit of "warehouse wear" such as deteriorated packaging and dust.  Supplies were limited, and apart from being a good heavy-duty straight key, they are also very collectable. See our Collectors' Corner page for some of the "varieties."

In 2004 we were able to get in touch with a factory agent in China, and were delighted to discover that the keys were still in production. And by going direct to the factory, we were able to get better prices.  They are still expensive to ship from China, of course, but we are happy to pass the sqc slipavings along to our customers.

The keys have chrome plating, machined needle bearings for the trunion, hard silver (K4) or brass (K5) contacts, and a felt pad on the base.  They weigh around two and a quarter pounds each!  Approximate base dimensions are 2-3/4 x 4-3/4 inches.  They're  2-1/2 inches high  and the center of the knob is forward of the base about an inch.

Some users have said that the spring tension is too heavy, and can be adjusted by stretching  the spring and/or clipping off a turn. But the best approach (described to me by a professional Radio Officer) is to close the gap until the contacts are touching, then back off until there is the tiniest perceivable gap.  With that adjustment, the K4 and K5 will key with the slightest touch and you might even need to increase the spring tension a bit. 

The D117/K4 keys are excellent value at $69.95 

K5 as above with with HPb59 brass contacts  $49.95 


"The D117 key is the best value in a key purchase I have made over the last twenty five years.  Morse Express does it again."
   --Mario, W6OH

"The D117 is a great key-- China's loss and my gain.  Thankyou  Mr. Chou En Lai!"

-Don, KB8KRD

K7 "Big John" Training Key
Click the thumbnail image above to view in full size!


The K7 keys are out of production.  The info will remain here for reference purposes. 

This is the key the PLA uses to train its new Morse operators.  If he survives the three months of  training, the "Big John Soldier" (recruit) is given a K4 or D117 for operational use.

These are inexpensive keys, on  heavy composite bases, but they are well made, fully adjustable, and feature nice touches like genuine needle bearings and seats for the trunion.  Cord with 1/4" phone plug on the end is included.  The cord attaches to binding posts, and the wiring on the base is recessed into routed channels.

The base measures just a bit smaller than the D117/K4, and the total weight of the key is a mere 8 ounces.

Order on-line, or call 800-238-8205 for credit card orders
or call 303-752-3382 for more information


 HomeBack to Home Page    
 Questions or Comments? Write to us!  e-mail    Privacy Policy  FAQ
All text and images in this web site (comprising the registered domains,, and  are the intellectual property of Milestone Technologies or are used with permission of the copyright holder. Some images are in the public domain; others are not-- please ask before "borrowing" them.
Copyright 1996-2014, Milestone Technologies, Inc. All Rights Reserved