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Flange To Boss Straight Adapter

NSN: 4730-00-006-9938 | Model: GB15C1

An adapter having a flange connection on one end designed to connect with another flange connection or a compression type mounting pad. The other end has external or internal machine threads (straight threads other than pipe or hose series) and is designed to facilitate a gasket, preformed packing, washer, or the like to form a seal at the boss. It is designed to join a flange or flange fitting to boss or boss fitting in a straight line on items such as tanks, housings, valve fittings, and the like.


Leg length: 0.296 inches at all ends, nominal thickness: 0.125 inches at 1st end

NSN Properties and Flags
NATO Stock Number
Thread Class
3b 2nd end
Bolt Hole Quantity
4 1st end
Connection Style
Gasket seal (boss) 2nd end
Leg Length
0.296 inches all ends
Flange Shape
Round with holes 1st end
Connection Type
Threaded internal boss 2nd end
Nominal Thread Size
0.562 inches 2nd end
Nominal Outside Diameter
1.562 inches 1st end
Nominal Thickness
0.125 inches 1st end
Bolt Hole Nominal Diameter
0.13 inches 1st end
Bolt Circle Nominal Diameter
1.156 inches 1st end
Flange Face Design
Plain 1st end
Nominal Overall Length
0.593 inches
Aluminum Alloy 2024
Material Document and Classification
Qq-a-200/3 fed spec single material response or qq-a-225/6 fed spec single material response
Surface Treatment
Surface Treatment Document and Classification
Mil-a-8625 mil spec single treatment response
Thread Series Designator
Unf 2nd end

Pricing and Availability

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NSN 4730-00-006-9938 Datasheet

Supply Class (FSC):
Railing Fittings Lubrication Tube Pipe Hose
Cross Reference:
  • GB15C1
Cage Codes:
  • Northrop Grumman Systems Corporation (CAGE 26512)
Schedule B & Trade:
  • Schedule B: 7609000000 (NAICS 332919)

    Aluminum tube or pipe fittings (couplings, elbows sleeves)

  • SITC: 68427

    Aluminum and aluminum alloy tube and pipe fittings (e.G. Couplings, elbows and sleeves)

  • End Use: 12300

    Finished metal shapes


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


U - Precious metal content is unknown


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

Freight Information:
  • NMFC:

    051400 - Pipe fittings aluminum

  • WCC:

    576 - Metal and metal products, nos, (less than 35 feet)

  • SHC:

    9 - Other or no special handling required (sh)

  • ADC:

    A - Shipment is not a consolidation and does not exceed 84 inches in any dimension.

  • ACC:

    B - Construction materials: includes paint and related materials, prefabricated building, wood products, metal and composition mater

  • LTL:

    P - 77.5

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
  • AAC
  • Quantity per pack
  • Unit of Measure
  • Shelf Life
  • Classification Control
  • Repariability

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $133.16 to $221.94..
Does NSN 4730-00-006-9938 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Department Of The Navy
What is the NIIN of NSN 4730-00-006-9938?
000069938 or 00-006-9938
Does NSN 4730-00-006-9938 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 4730-00-006-9938?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Jul 06, 1972