Model: 3991-12

Quick Disconnect Coupling Half

Special Features:

Grumman aircraft corp, a-10 aircraft model

Properties:

Thread Class
3a all ends
Overall Length
3.131 inches
Quick Disconnect Method
Quick lead thread all ends
Bolt Hole Quantity
6
Basic Shape Style
3 round first quick disconnect end
Basic Shape Style
Round first quick disconnect end
Connection Style
Flared all ends
Connection Type
Threaded external tube first fluid end connection
Features Provided
Self-sealing
Thready Qty Per Inch (tpi)
12 all ends
Thread Size
1.312 inches all ends
Mounting Flange Location
First leg
Seat Angle
37.0 degrees
Outside Diameter
2.750 inches
Bolt Hole Diameter
0.201 inches
Bolt Circle Diameter
2.375 inches
Outside Diameter Tube Accommodated
1.000 inches all ends
Material
Aluminum alloy body
Surface Treatment
Anodize body
Surface Treatment Specification
Mil-a-8625 military standard single treatment response body
Style Designator
Male coupling half
Thread Series Designator
Un all ends
NSN
4730-00-640-1878
Part Number
3991-12
Description
Coupling Half,quick Disconnect
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 internal or external quick disconnect feature for connecting a mating part to form a quick disconnect coupling assembly. The fitting may incorporate a self-sealing feature for the purpose of automatically shutting off the flow of fluid when disconnected from its mating half. For self-sealing fittings with an external or internal threaded disconnect end, see coupling half, self-sealing. See also, connector, multiple, fluid pressure line.

Part 3991-12 NSN 4730-00-640-1878

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
18681
FIIG:
A531T0
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:
SX
CRITL:
X

Packaging & Shipping

Est. Pack Size
Est. Pack Weight
Est. Item Weight
Est. Item Dim.
Pack Size:
--
Paclk Weight:
0.5000lbs
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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