Restrictor Check Valve
749986-103
(NSN) National Stock Number
4820-00-301-0256
Federal Supply Classification
4820 Nonpowered Valves
Item Name Code
20520
Schedule B Code
8481309000
Summary
3a 1st end thread class, right-hand 1st end thread direction, 0.060 inches nominal aperture diameter, poppet flow control device, spring disk loading method, -65.0 deg fahrenheit 1st response maximum operating temp
| DAC | HCC | DMIL | RNCC |
|---|---|---|---|
| 6 | - | - | 3 |
| RNVC | SADC | MSDS | RNAAC |
|---|---|---|---|
| 2 | - | - | ZZ |
Identification
A valve having an orifice in the poppet, disk, or the like, to permit restricted fluid flow when the valve is seated. It does not have a stem or provisions for pressure adjustments, and is similar to a valve, check with the exception of the orifice which permits fluid flow in more than one direction.
| INC | FIIG | Concept | Condition |
|---|---|---|---|
| 20520 | A530B0 | 1 | 1 |
Specifications
Thread Class
3a 1st end
Details
A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.Thread Direction
right-hand 1st end
Details
The direction of the thread when viewed axially. a right-hand thread winds in a clockwise direction while a left-hand thread winds in a counterclockwise direction.Aperture Diameter
0.060 inches nominal
Details
The length of a straight line which passes through the center of an aperture,and terminates at the circumference.Flow Control Device
poppet
Details
The part that controls the flow through the item.Disk Loading Method
spring
Details
The means of closing the item when inlet pressure decreases.Maximum Operating Temp
-65.0 deg fahrenheit 1st response
Details
The maximum temperature at which the item is rated to operate for an extended period of time.Maximum Operating Temp
135.0 deg fahrenheit 2nd response
Details
The maximum temperature at which the item is rated to operate for an extended period of time.Connection Style
beveled (tube) 2nd end
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the connection.Connection Style
flared (tube) 1st end
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the connection.Valve Operation Method
automatic
Details
The means used to control the operation of the valve.Connection Type
butt weld tube 2nd end
Details
Indicates the type of connection/s/.Connection Type
threaded external tube 1st end
Details
Indicates the type of connection/s/.Mounting Position
horizontal or vertical
Details
The installed position for which the item is designed.Maximum Operating Pressure
60.0 pounds per square inch single response
Details
The maximum pressure at which the item is rated for operation.Nominal Thread Size
0.562 inches 1st end
Details
A designation that is used for the purpose of general identification of the thread.Seat Angle
37.0 degrees 1st end
Details
The angle of the end surface upon which the mated surface seats.Nominal Outside Diameter Tube Accommodated
1.000 inches 2nd end
Details
The nominal length of a straight line which passes through the center of the accommodated tube,and terminates at the outside circumference.Material
aluminum alloy body
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Material
aluminum alloy seat
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Material
plastic polyamide flow control device
Details
The chemical compound or mechanical mixture properties of which the item is fabricated.Material Document And Classification
qq-a-200/4, comp 5083, temper h111 fed spec single material response body
Details
The specification, standard, or manufacturer's reference and the classification designation, such as class, condition, temper, and the like, that identifies the material.Material Document And Classification
qq-a-200/4, comp 5083, temper h111 fed spec single material response seat
Details
The specification, standard, or manufacturer's reference and the classification designation, such as class, condition, temper, and the like, that identifies the material.Media For Which Designed
fuel/oil, hydrocarbon single response
Details
The type of media for which the item is designed.Surface Treatment
anodize
Details
The metallic,nonmetallic,and/or chemical properties with which the item is plated,dipped,and/or coated.the treatment is designed to protect the surface(s) and cannot be wiped off.Surface Treatment Document And Classification
mil-a-8625,ty 2 mil spec single treatment response
Details
The specification,standard,or manufacturers reference,and the classification designation,such as type,class,grade,and the like,that identifies the surface treatment material.Style Designator
straight thru
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the item.Thread Series Designator
unf 1st end
Details
A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.Master-Cross Reference List
| Part | CAGE | DAC | HCC | RNCC | RNVC | MSDS | RNAAC |
|---|---|---|---|---|---|---|---|
| 2700122 | 92003 | 1 | - | 3 | 2 | - | KE |
| 2700172 | 92003 | 1 | - | 3 | 2 | - | KE |
Material and Special Handling
Hazardous material, precious metals, criticality, and electrostatic discharge indicators.
| HMIC | PMIC | ESD/EMI | Criticality |
|---|---|---|---|
| N | U | - | - |
Freight
Universal / National Freight and Handling Information
| UFC | HMC | LTL | LCL |
|---|---|---|---|
| 29300 | - | W | - |
| RVC | WCC | TCC | SHC |
|---|---|---|---|
| - | 576 | Z | 9 |
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Manufacturer
LOCKHEED MARTIN CORP DIV LOCKHEED MARTIN AERONAUTICS COMPANY
CAGE: 98897
MARIETTA
, GA
, 30063-0001
UNITED STATES
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FAQs
Frequently asked questions for NSN 4820-00-301-0256
What is the NIIN of the NSN 4820-00-301-0256?
The National Item Identification Number (NIIN) of the NSN 4820-00-301-0256 is 00-301-0256
When the NSN 4820-00-301-0256 was assigned to the Federal Catalog?
It was assigned 51 years ago, on Fri, Oct 12, 1973
Does the NSN 4820-00-301-0256 contain any precious metals?
Type/content is unknown
Does the NSN 4820-00-301-0256 contain any hazardous material?
No data in HMIRS
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