NSN 4820-01-367-9902 N1178BB, N-1178-BB, KN31250

Product Details | SAFETY RELIEF VALVE

4820-01-367-9902 A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes VALVE (1), RELIEF, PRESSURE AND TEMPERATURE.

Part Alternates: N1178BB, N-1178-BB, KN31250, 6HD841, 2GL643, 3539755, 4820-01-367-9902, 01-367-9902, 4820013679902, 013679902

Valves | Valves, Nonpowered

Supply Group (FSG)	NSN Assign.	NIIN	Item Name Code (INC)
48	23 NOV 1992	01-367-9902	05488 ( VALVE, SAFETY RELIEF )

Drawings & Photos | NSN 4820-01-367-9902

Part Number	Request Date	QTY	Origin
3539755	2025-11-324	130	DIBBS
KN31250	2025-11-324	130	DIBBS
3539755	2025-03-72	148	DIBBS
KN31250	2025-03-72	148	DIBBS
3539755	2023-12-362	152	DIBBS
KN31250	2023-12-362	152	DIBBS
3539755	2022-09-244	224	DIBBS
KN31250	2022-09-244	224	DIBBS
3539755	2022-05-125	178	DIBBS
KN31250	2022-05-125	178	DIBBS
3539755	2019-06-153	360	DIBBS
KN31250	2019-06-153	360	DIBBS
4820-01-367-9902	2015-07-182	644	DIBBS
4820-01-367-9902	2014-05-142	593	DIBBS
4820-01-367-9902	2012-08-243	323	DIBBS
4820-01-367-9902	2012-02-39	81	DIBBS
4820-01-367-9902	2011-09-273	431	DIBBS
4820-01-367-9902	2011-07-210	255	DIBBS
4820-01-367-9902	2011-06-172	113	DIBBS
4820-01-367-9902	2011-03-67	202	DIBBS
4820-01-367-9902	2010-08-236	166	DIBBS
4820-01-367-9902	2010-05-146	124	DIBBS
4820-01-367-9902	2010-01-08	48	DIBBS

Cross Reference | NSN 4820-01-367-9902

Part Number	Cage Code	Manufacturer
2GL643	45152	OSHKOSH CORPORATION
3539755	45152	OSHKOSH CORPORATION
3539755	75Q65	OSHKOSH DEFENSE, LLC
6HD841	45152	OSHKOSH CORPORATION
KN31250	06721	HALDEX BRAKE PRODUCTS CORPORATION DIV BREAK PRODUCTS DIVISION
N-1178-BB	06721	HALDEX BRAKE PRODUCTS CORPORATION DIV BREAK PRODUCTS DIVISION

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Related Products | NSN 4820-01-367-9902

4820-01-367-9903, 4820-01-367-9904, 4820-01-367-9905, 4820-01-367-9906, 4820-01-367-9910

Technical Data | NSN 4820-01-367-9902

Characteristic	Specifications
FLOW CONTROL DEVICE	POPPET
VALVE OPERATION METHOD	AUTOMATIC
CONNECTION TYPE	THREADED EXTERNAL PIPE ALL ENDS
CONNECTION STYLE	G46B PLAIN ALL ENDS
THREAD SERIES DESIGNATOR	NPTF ALL ENDS
NOMINAL THREAD SIZE	0.375 INCHES ALL ENDS
THREAD DIRECTION	RIGHT-HAND ALL ENDS
DISK LOADING METHOD	SPRING
OPENING PRESSURE SETTING	150.0 POUNDS PER SQUARE INCH
SPECIAL FEATURES	WEAPON SYSTEM ESSENTIAL
CRITICALITY CODE JUSTIFICATION	FEAT
III END ITEM IDENTIFICATION	2320-01-318-9902 HET (HEAVY EQUIPMENT TRANSPORTER); NSN 2320-01-304-2277 PLS (PALLETIZED LOADING SYSTEM)

Restrictions/Controls & Freight Information | NSN 4820-01-367-9902

Restrictions
Freight

Category	Code	Description
Shelf-Life Code:	0	Nondeteriorative
Hazardous Material Indicator Code	N	There is no data in the HMIS and the NSN is in an FSC not generally suspected of containing hazardous materials
Demilitarization Code:	A	Non-Munitions List Item/ Non-Strategic List Item - Demilitarization not required.
Controlled Inventory Item Code:	U	UNCLASSIFIED
Precious Metals Indicator Code:	A	Item does not contain precious metal
Criticality Code:	Y	The item does not have a nuclear hardened feature but does have other critical feature(s) such as tolerance, fit restriction or application.

Category	Code	Description
NMF Description	127220	PRESSURE REG/RED/RELIEF VALVES NOI
Less than car load rating
Less than truck load rating	P	77.5
Water commodity Code	594	unknown
Originating Activity Code	AH	Defense Supply Center Columbus Columbus, OH 43215
Air Dimension Code	A	Shipment is not a consolidation and does not exceed 72 inches in any dimension.
Air Commodity	V	Vehicles, machinery, shop and warehouse equipment and supplies, including special tools and equipment, ground servicing and special purpose vehicles, marine equipment and supplies, repair and maintenance parts for the above.
Air Special Handling	Z	No special handling required.
Special Handling Code	9	unknonwn
HAZMAT
Type of Cargo	Z	No special type of cargo code applicable

Management | NSN 4820-01-367-9902

Category	Code	Description
Materiel Category and Inventory Manager	J	Ground Forces Support Materiel (DLA/GSA Items)
Appropriation and Budget Activity	2	Stock Fund Secondary Items
Management Inventory Segment	2	NONREPARABLE ITEMS (Exclusive of Insurance and Provisioning Items). This code will be used to identify items which are not reparable.
Specific Group/Generic Code	0	Medical Materiel
Weapons Systems/End Item or Homogeneous Group	00	DLA/GSA-Managed Items that cannot be identified to a specific Army Weapons Systems/End Item
Accounting Requirements Code	X	Expendable item. An item of Army property coded with an ARC of ?X? in the AMDF. Expendable items require no formal accountability after issue from a stock record account. Commercial and fabricated items similar to items coded ?X? in the AMDF are considered expendable items.
Source of Supply	SMS	Defense Logistics Agency Enterprise Business Systems
Agency	DA	Department of the Army
Service Organization	A	U.S. Army
Reparability	Z	This is a nonreparable item. If condemned or economically unserviceable, then dispose at the level authorized replace the item.
Acquisition Advice Codes	Z	INSURANCE/NUMERIC STOCKAGE OBJECTIVE ITEM # Items which may be required occasionally or intermittently, and prudence requires that a nominal quantity of materiel be stocked due to the essentiality or the lead time of the item. 1. The item is centrally managed, stocked, and issued. 2. Requisitions will be submitted in accordance with IMM/Service requisitioning procedures.
Controlled Item Code	U	UNCLASSIFIED
Shelf Life Code	0	Nondeteriorative
Purchasing	QTY UOM	1 EA : Each

Category	Code	Description
Budget Code	9	General Support DIV57X4921.070:Air Force decentrally managed expense items (ERRC XB3, XF-3) with a unit cost of less than $250,000 that are requisitioned/procured at base (retail) level from DLA, GSA, Army, Navy, Depot Maintenance Service, Air Force Industrial Fund (AFMC), local manufacture and commercial vendors.
Price Validation	N	The current standard price in Catalog Management Data (CMD) has not analyzed or coded for LP/LM. The price has not been analyzed or reviewed for accuracy. ZOP or Standard price challenges are permissible, but must be supported with adequate justification. However, if coded for Local Purchase (LP) or Fabrication/Manufacture as indicated with an (LM) Acquisition Advice Code of ?L? or?F?,the case must be evaluated locally where purchased or fabricated.
Fund Code	SF	Stock fund applicable to items managed for the Air Force by the respective Inventory Control Point.
Source of Supply	SMS	Defense Logistics Agency Enterprise Business Systems
Agency	DF	Department of the Air Force
Service Organization	F	U.S. Air Force
Reparability	N	Stock Fund (except Munitions)
Acquisition Advice Codes	Z	INSURANCE/NUMERIC STOCKAGE OBJECTIVE ITEM # Items which may be required occasionally or intermittently, and prudence requires that a nominal quantity of materiel be stocked due to the essentiality or the lead time of the item. 1. The item is centrally managed, stocked, and issued. 2. Requisitions will be submitted in accordance with IMM/Service requisitioning procedures.
Controlled Item Code	U	UNCLASSIFIED
Shelf Life Code	0	Nondeteriorative
Purchasing	QTY UOM	1 EA : Each

Category	Code	Description
Stores Account Code	1	Marine Corps Stock Fund Account Item.
Combat Essentiality Code	5	Critical Repair Part to a Combat Essential End Item. Those parts or components whose failure in a combat essential end item will render the end item inoperative or reduce its effectiveness below the minimum acceptable level of efficiency.
Materiel Management Code	B	All CommoditiesDefense Logistics Agency, (DLA,)
Echelon Management Code	2	ICP/DSSC Marine Corps-managed Recoverability Code D items and Defense Logistics Agency (DLA)/TACOM/GSA) items which the integrated manager has not decontrolled.
Physical Category Code	1	Bin
Source of Supply	SMS	Defense Logistics Agency Enterprise Business Systems
Agency	DM	U.S. Marine Corps
Service Organization	M	U.S. Marine Corps
Reparability	Z	Nonreparable item. When unserviceable, condemn and dispose at the level indicated by the first digit of the maintenance code.
Acquisition Advice Codes	Z	INSURANCE/NUMERIC STOCKAGE OBJECTIVE ITEM # Items which may be required occasionally or intermittently, and prudence requires that a nominal quantity of materiel be stocked due to the essentiality or the lead time of the item. 1. The item is centrally managed, stocked, and issued. 2. Requisitions will be submitted in accordance with IMM/Service requisitioning procedures.
Controlled Item Code	U	UNCLASSIFIED
Shelf Life Code	0	Nondeteriorative
Purchasing	QTY UOM	1 EA : Each

Category	Code	Description
Cognizance Codes	9B	Navy-owned stocks of DLA material Naval Inventory Control Point, Mechanicsburg
Source of Supply	SMS	Defense Logistics Agency Enterprise Business Systems
Agency	DN	Department of the Navy
Service Organization	N	U.S. Navy
Acquisition Advice Codes	Z	INSURANCE/NUMERIC STOCKAGE OBJECTIVE ITEM # Items which may be required occasionally or intermittently, and prudence requires that a nominal quantity of materiel be stocked due to the essentiality or the lead time of the item. 1. The item is centrally managed, stocked, and issued. 2. Requisitions will be submitted in accordance with IMM/Service requisitioning procedures.
Controlled Item Code	U	UNCLASSIFIED
Shelf Life Code	0	Nondeteriorative
Purchasing	QTY UOM	1 EA : Each