NSN 4820-00-283-1176 Repair Services

Restrictor Check Valve Overhaul, Repair, and Maintenance

MPN: 4R121-101, 6F2962-101, 749831-101

Pricing and Lead Time Quote

Submit this form and receive an overhaul/repair pricing and lead time quote for NSN 4820-00-283-1176 restrictor check valve
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NSN 4820002831176


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AS9120B:2015 ISO 9001 Audited and Certified

FAA and EASA Part 145 Certified Repair Stations Ensuring the highest standards of quality and compliance for our clients' needs.

We specialize in the repair and refurbishment of nsn components. From mechanical assemblies to rotor blades, our comprehensive capabilities cover a wide range of NSN parts, providing cost effective solutions to extend the operational life of vital equipment.

NSN 4820-00-283-1176 has been designated as a repairable item and has been included in our capabilities catalog. If you require overhaul or repair services use the form on this page to send us your information. We will provide you with a lead time and price quote.

Repairability and Datasheet

NSN 4820-00-283-1176 can be offered in repaired, serviceable, overhauled, or inspected conditions.
National Stock Number (NSN) 4820-00-283-1176
Categorization Check valves of steel
Repairability Code D

When repair is beyond lower level maintenance capability, evacuate the item to depot. disposal is not authorized below wholesale level.

Approximate Weight 2.7lb
Thread Class 3a 1st end
Thread Direction Right-hand 1st end
Flow Control Device Poppet
Maximum Operating Temp 275.0 degrees fahrenheit single response
Connection Style Flareless 2nd end
Valve Operation Method Automatic
Connection Type Threaded external tube 2nd end
Mounting Position Horizontal or vertical
Thready Qty Per Inch (tpi) 20 2nd end
Maximum Operating Pressure 3000.0 pounds per square inch single response
Thread Size 0.562 inches 1st end
Seat Angle 12.0 degrees 2nd end
Outside Diameter Tube Accommodated 0.375 inches 1st end
Material Stainless steel flow control device
Media For Which Designed Hydraulic fluid, phosphate-ester base single response
Surface Treatment Passivate
Style Designator Straight thru
Thread Series Designator Unjf 1st end

Part Numbers

Part Number Company RNAAC (Repair Depot)
4R121-101 ALLEN AIRCRAFT PRODUCTS INC KE - NAVAL ICP
6F2962-101 CRISSAIR, INC. KE - NAVAL ICP
749831-101 LOCKHEED MARTIN CORPORATION ZZ - USA