MS21902D4
Military Standard Boss Nipple
Tube outside: 1/4", union, aluminum alloy 2024, flareless tube, MS21902 series fitting

Additional Information
Alternate Part Numbers
SKU / Model: | MS21902D4 |
NSN: | 4730-00-142-2155 |
FSC: | Hose, Pipe, Tube, Lubrication, and Railing Fittings / 4730 |
Product Series: | MS21902D |
Pack Weight (Approx.) | 0.045 lb |
Minimum Qty (MOQ): | 2 |
Schedule B: | 7609.00.0000 |
ECCN: | EAR99 |
National Motor Freight: | 051400, Pipe Fittings Aluminum |
Download PDF Version MS21902D4_Military-Fasteners-com.pdf |
|
![]() ![]() |
* report an issue on this page
Frequently bought together
Other customers frequently bought these along with MS21902D4

MS21902D5
Boss Nipple
in Fittings
outside 5/16", union, flareless, aluminum alloy 2024, MS21902 series fitting

MS21902D6
Boss Nipple
in Fittings
Tube outside 3/8", union, flareless tube, aluminum alloy, MS21902 series fitting

MS21914-4W
Tube Cap
in Fittings
Tube outside diameter: 1/4", pressure seal, flareless tube, aluminum alloy, MS21914 series fitting
More MS21902D boss nipples
Aluminum alloy outside diameter 1/2 union flareless tube fitting, 4730-00-529-3763
Aluminum alloy tube outside 3/8 union flareless fitting
Aluminum alloy 2024 outside 5/16 union flareless
$19.80 Each, Aluminium alloy outside 3/16in. union flareless fitting
$66.00 Each, Aluminium alloy 2024 outside 1/8in. union flareless
$33.54 Each, Aluminum alloy tube outside 1in., union flareless tube fitting
Have a question
If you require a quote on this or any product please visit our quote request page »
Browse our frequently asked questions page.
You may contact us by phone at +1 (904) 543-6395 or
email us using our contact form.
Our hours of operation are 8:00am - 6:00pm EST
Customer Reviews

Military Fasteners did an excellent job fulfilling my most recent order. This superior performance is typical for ACS. My order arrived in excellent condition within just 3 days of placing the order. Well done!
My new David Clark headset arrived earlier than expected and everything was perfect. Whole order/delivery experience was excellent.
No matter the size of my order, I am always treated with a high degree of professional courtesy. The staff are very knowledgeable about the company and take a personal interest in each order.
Very pleased with the customer service I get when I call. My Cessna 182 is always needing a little bit of extra LOVE from Military Fasteners. When I call to order parts, your training and customer service of your order takers are the tops.. They understand what I'm looking for and can help me figure out how to order it. I've upgraded my old normal headsets to your reconditioned Bose X General Aviation Noise Cancelling. These are my first Noise Cancelling headsets and we are very pleased...I've come back and purchased 2 more...You are a very professional group! With your shipping location in Atlanta, sometimes, I get things in 1 day or 2 at the most. Thanks.
Please complete this form if you're having an issue with ordering this item or this item displays invalid or innacurate information or specifications. We thank you for taking the time to report issues so that we may better serve you.