Model: MS21957-4

Self-sealing Coupling Assembly

Special Features:

Bulkhead threads on fluid connection end

Properties:

Thread Class
3a first quick disconnect end
Overall Length
2.751 inches
First Leg Length
1.048 inches
Second Leg Length
Between 0.730 inches and 0.750 inches
Connection Style
Beaded second quick disconnect end
Connection Style
Flared first quick disconnect end
Connection Type
Threaded external tube first quick disconnect end
Connection Type
Unthreaded external hose second quick disconnect end
Features Provided
Self-sealing
Second End Relationship With First End
Not identical
Maximum Operating Pressure
180.0 pounds per square inch single response
Thread Size
0.438 inches first quick disconnect end
Seat Angle
37.0 degrees
Inside Diameter Hose Accommodated
0.375 inches second quick disconnect end
Outside Diameter Tube Accommodated
0.250 inches first quick disconnect end
Material
Aluminum alloy body
Material Specification
Qq-a-268, t4 federal specification single material response body
Surface Treatment
Anodize body
Surface Treatment Specification
Mil-a-8625 military specification single treatment response body
Style Designator
Coupling assembly
Thread Series Designator
Unf first quick disconnect end
NSN
4730-00-618-7568
Part Number
MS21957-4
Description
Coupling Assembly,self-sealing
CAGE
96906

A multipiece fluid line fitting consisting of two coupling half, self-sealing fittings.

Part MS21957-4 NSN 4730-00-618-7568

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
18279
FIIG:
A531U0
Concept No.:
App. Key:
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:
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
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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