Model: 3991-029

Self-sealing Coupling Half

Special Features:

3 lockwire holes equally spaces, 0.877 in. Dia

Properties:

Thread Class
3a all ends
Overall Length
1.987 inches
Exterior Color
Blue
Maximum Operating Temp
275.0 degrees fahrenheit single response
Connection Style
Flared all ends
Connection Type
Threaded external tube first fluid end connection
Features Provided
Safety locking feature
Maximum Operating Pressure
3000.0 pounds per square inch single response
Thread Size
0.438 inches all ends
Seat Angle
37.0 degrees
Material
Aluminum alloy body
Material Specification
Qq-a-268 federal specification single material response body
Surface Treatment
Anodize body
Surface Treatment Specification
Mil-a-8625 military specification single treatment response body
Style Designator
Male coupling half
Thread Series Designator
Unf all ends
Furnished Items And Quantity
1 nut
NSN
4730-01-328-5511
Part Number
3991-029
Description
Coupling Half,self-sealing
CAGE
82386

A fluid line fitting having a pipe, tube or hose connection or a through hole to accommodate a bolt, fluid passage on one end. The other end must have an external or internal thread for connecting a mating part to form a self-sealing coupling assembly. The fitting has either a self-sealing feature for the purpose of automatically shutting off the flow of fluid when disconnected from its mating half, or, if it has no self-sealing feature, is specifically designed to mate with a fitting with a self-sealing feature. For self-sealing fittings with a quick disconnect end, see coupling half, quick disconnect. For fluid line fittings without a self-sealing feature, see coupling (as modified).

Part 3991-029 NSN 4730-01-328-5511

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
18281
FIIG:
A531W0
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:
A
ESD:
ESD:
MMAC:
CRITL:
X

Packaging & Shipping

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