Model: MS21916W12-4

Boss Reducer

Properties:

Thread Class
3a all ends
Reducer Type
Concentric
End Application
Used on boeing vertol cargo transport helicopter, model ch-47
Connection Style
External seat for gasket seal (boss) all ends
Connection Type
Threaded external boss all ends
Thready Qty Per Inch (tpi)
12 1st end
Thread Size
0.438 inches 2nd end
Thread Size
1.062 inches 1st end
Nominallength
1.531 inches
Material
Aluminum alloy 2024
Material Specification
Qq-a-225/6, t6 federal specification single material response
Surface Treatment
Anodize
Surface Treatment Specification
Mil-a-8625 military specification single treatment response
Thread Series Designator
Unj 1st end
Thread Series Designator
Unjf 2nd end
Specification Data
96906-ms21916 government standard
NSN
4730-00-640-5860
Part Number
MS21916W12-4
Description
Reducer,boss
CAGE
81343

A straight fitting having a boss connection of a different size at each end. Both connections have external or internal machine threads (straight threads other than pipe or hose series) and are designed to facilitate a gasket, preformed packing, washer, or the like to form a seal at the boss. Excludes bushing (as modified).

Part MS21916W12-4 NSN 4730-00-640-5860

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
23541
FIIG:
A080B0
Concept No.:
App. Key:
A
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
U
ESD:
ESD:
MMAC:
SX
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
4.0 X 0.0 X 0.0
Paclk Weight:
0.1000lbs
Item Weight:
--
Item Dim:
--
OPI
SPI No.
SPI Rev.
SPC Mkg.
LVL A
LVL B
OPI:
O
SPI No.:
SPI Rev.:
SPC Mkg:
00
LVL_A:
Q
LVL_B:
Q

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
051400
UFC:
29700
LTL:
77.5
LCL:
--
WCC:
576
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 7609000000
  • SITC: 68427
  • End Use: Finished metal shapes
  • NAICS: 332919
  • USDA: 1

Freight Class: Aluminum tube or pipe fittings (couplings,elbows sleeves)

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