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Worldwide distributor of NSN parts and consumables located in the USA.

Boss Nipple

Model / MPN: AS21900-4J | NSN: 4730-01-022-4442
ITAR Registered seal

A straight, one-piece fitting used to join two bosses or boss fittings. Both ends are the same size and have external machine threads (straignt threads other than pipe or hose series). It is designed to facilitate a gasket, preformed packing, washer, or the like to form a seal at the boss. The center section may be suitably shaped to accommodate a wrench.

Product Details
NATO Stock Number
4730-01-022-4442
Sold in multiples of
1 EA
DEMIL
NO
Thread Class
3a all ends
Maximum Operating Temp
135.0 degrees celsius single response
Connection Style
External seat for gasket seal (boss) 2nd end
Connection Style
Flared w/ gasket seal (boss) 1st end
Connection Type
Threaded external boss all ends
Maximum Operating Pressure
3000.0 pounds per square inch single response
Thread Size
0.438 inches all ends
Nominallength
1.187 inches
Material
Steel comp 304
Material Specification
Qq-s-763 federal specification single material response
Surface Treatment
Passivate inside
Surface Treatment
Passivate outside
Surface Treatment Specification
Mil-f-14072, e300, type 2 military specification single treatment response outside
Surface Treatment Specification
Mil-s-5002 military specification single treatment response inside
Style Designator
Flared and flareless w/ center wrenching facility
Thread Series Designator
Unjf all ends
Specification Data
96906-ms21900 government standard
AS21900 Series Parts
Solicitations
Solicitation Description Qty UOM Close Date
SPE7M317Q0354 Nipple, Boss 122 PG 02/28/2017
SPE7M419T2573 Nipple, Boss 300 PG 12/14/2018

Pricing and Availability

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AS21900-4J Cross Reference
  • MS21900-4C
  • MS21900-4J
  • AS18280
  • AS21900
  • MS21900J4
  • MS21900J4
  • 4730004076524
  • AS19200