Boss Nipple

NSN: 4730-01-316-6345 | Model: MS21902K20

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.

NSN Properties and Flags

NATO Stock Number

4730-01-316-6345

DEMIL

Thread Class

3a all ends

Connection Style

External seat for gasket seal (boss) all ends

Connection Type

Threaded external boss all ends

Thready Qty Per Inch (tpi)

12 all ends

Thread Size

1.625 inches all ends

Nominallength

1.750 inches

Material

Steel comp 316 or steel comp 304

Material Specification

Qq-s-763 federal specification single material response

Surface Treatment

Passivate

Surface Treatment Specification

Mil-s-5002 military specification 1st treatment response and qq-p-35, type 1 federal specification 2nd treatment response

Style Designator

Flareless (tube)

Thread Series Designator

Unj all ends

Inventory Check

The last inventory check on this NSN was done on 04/29/2025. Due to rapid changes in inventory this may not be the current stock qty.

New: 62
New Surplus: 6
Serviceable: 1

Pricing and Availability

Send us a request for quote using the form below. Our team will contact you with an up to date pricing and availability quote ASAP.

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HAZMAT Certified
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NSN 4730-01-316-6345 Datasheet

Supply Class (FSC):

Railing Fittings Lubrication Tube Pipe Hose

Cross Reference:

MS21902K20

Cage Codes:

Military Standards (CAGE 96906)

Schedule B & Trade:

Schedule B: 7307994000 (NAICS 332919)

Other fittings nesoi of alloy steel not stainless
SITC: 67959

Iron and steel tube and pipe fittings, n.E.S.
End Use: 12110

Iron and steel products, other

Identification:

HMIC

N - Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

PMIC

U - Precious metal content is unknown

CRITL

- The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Questions & Answers:
What are the historical prices recorded for this stock number?
No pre-dated pricing for this NSN could be found.
Does NSN 4730-01-316-6345 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Canada, France, Italy, and Denmark
What is the NIIN of NSN 4730-01-316-6345?
013166345 or 01-316-6345
Does NSN 4730-01-316-6345 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 4730-01-316-6345?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Mar 13, 1990