Model: MS21916W6-4

Boss Reducer

Properties:

Thread Class
3a all ends
Reducer Type
Concentric
Connection Style
External seat for gasket seal (boss) all ends
Connection Type
Threaded external boss all ends
Maximum Operating Pressure
3000.0 pounds per square inch single response
Thread Size
0.438 inches 2nd end
Thread Size
0.562 inches 1st end
Nominallength
1.219 inches
Material
Aluminum alloy
Material Specification
Qq-a-250/12, alloy 7075 federal specification single material response
Media For Which Designed
Aeronautical fluid single response
Surface Treatment
Anodize outside
Surface Treatment Specification
Mil-a-8625 military specification single treatment response outside
Thread Series Designator
Unjf all ends
NSN
4730-00-166-4191
Part Number
MS21916W6-4
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 MS21916W6-4 NSN 4730-00-166-4191

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 4.0 X 0.5
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

End Items End applications NSN 4730-00-166-4191 is a component of

  • Hercules C-130 Aircraft
  • Galaxy C-5 Aircraft
  • Viking S-3b Aircraft
  • Sh-60b Lamps Mark Iii Helicopter
  • Orion P-3 Aircraft
  • Airlifter C-17a Aircraft
  • U-2 Airframe
  • F-22 Raptor Air Dominance Fighter
  • H-60 Seahawk Helicopter

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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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