MS21900-4
Military Standard Boss Nipple
outside diameter: 1/4", adapter, flareless tube to flared tube, carbon steel

MS21900-4 Datasheet Features and Specification
Quick Specs
Thread Series | UNJF |
Thread Class | 3A |
Material | Steel |
Additional Information
SKU / Model: | MS219004 |
NSN: | 4730-00-541-1579 |
FSC: | Hose, Pipe, Tube, Lubrication, and Railing Fittings / 4730 |
Product Series: | MS21900 |
Pack Weight (Approx.) | 0.058 lb |
Minimum Qty (MOQ): | 1 |
ECCN: | EAR99 |
National Motor Freight: | 052190, Pipe,tubing,or Pipe Or Tubing Fitti |
Download PDF Version MS21900-4_Military-Fasteners-com.pdf |
|
![]() ![]() |
* report an issue on this page
Frequently bought together
Other customers frequently bought these along with MS21900-4

MS21900-5
Boss Nipple
in Fittings
outside 5/16", adapter, flareless tube to flared tube, carbon steel
MS21900-8
Boss Nipple
in Fittings
Outside diameter: 1/2", carbon steel, adapter flareless tube to flared tube, MS21900 series fitting
More MS21900 boss nipples
$41.94 Each, Aluminium alloy 7075 tube outside 1/2in. adapter flareless tube to flared tube
Aluminum alloy 7075, tube outside 5/16in., adapter flareless tube to flared tube
Aluminum alloy 7075, tube outside 1/4in., adapter flareless tube to flared tube
Aluminum alloy 7075, tube outside 5/8in., adapter flareless tube to flared tube
4730-00-080-3731 Boss Nipple
Corrosion resistant steel 304 tube outside 1/4in. adapter flareless tube to flared tube
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

Easy to find parts, quick ordering, great customer service (if needed), quick shipping. All-in-all Im a very satisfied customer!
Great service, Shipping was only 2 days!
Excellent service! Trisha Hawkins is so polite, easy to work with and an awesome customer service! Highly recommended!
I have built an airplane with parts from Military Fasteners. In the last years I have only had one issue involving warranty problems and that was resolved by the factory. Good service and quality parts/availability are very good at Military Fasteners.
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.