General Characteristics Item Description: MATERIAL CARB. STEEL,ID 6.145/6.40 IN.,OD 6.893/6.890 INS.,BEVEL ANGLE 41 DEG PORM 30 MIN.,HEIGHT 0.750 PORM 0.016INS.,HARDNESS 80-110 BHN. IN
Criticality Code Justification: ZZZY
Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
Identification
NSN: 4820-01-240-1380
NIIN: 012401380
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Seal Ring,bonnet,valve, cataloged under National Stock Number 4820-01-240-1380, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 3 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 11 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-01-240-1380
Item Name
Seal Ring,bonnet,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
General Characteristics Item Description
MATERIAL CARB. STEEL,ID 6.145/6.40 IN.,OD 6.893/6.890 INS.,BEVEL ANGLE 41 DEG PORM 30 MIN.,HEIGHT 0.750 PORM 0.016INS.,HARDNESS 80-110 BHN. IN
Criticality Code Justification
ZZZY
Reference Number Differentiating Characteristics
MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL F — Mutilate — Cut
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
Y
⇄Related Items11
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-240-3346POSSIBLE MATCH
SEAL RING,BONNET,VALVE
Possible match (shared part number)
5330-01-240-6576POSSIBLE MATCH
PRESSURE SEAL RING
Possible match (shared part number)
5330-01-240-6577POSSIBLE MATCH
PRESSURE SEAL RING
Possible match (shared part number)
5330-01-241-6037POSSIBLE MATCH
SEAL RING,METAL
Possible match (shared part number)
5330-01-242-8934POSSIBLE MATCH
PRESSURE SEAL RING
Possible match (shared part number)
5330-01-251-1988POSSIBLE MATCH
RETAINER,PACKING
Possible match (shared part number)
5330-01-251-4743POSSIBLE MATCH
RETAINER,PACKING
Possible match (shared part number)
5330-01-255-3383POSSIBLE MATCH
RETAINER,PACKING
Possible match (shared part number)
5330-01-255-7673POSSIBLE MATCH
RETAINER,PACKING
Possible match (shared part number)
5330-01-257-8052POSSIBLE MATCH
SEAL RING,METAL
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
820-6015895-170-2
3/1Design control — primary reference
U.S. Government activity
310247/PC 170-2
5/1Secondary reference
Huntington Ingalls Inc Div Newport News Shipbuilding
N-11088/PC7-6IN
5/1Secondary reference
The Walworth Company
N-11088PC7,6IN,OVS NO2
5/1Secondary reference
The Walworth Company
N-55014PC7 NO2OVS
5/1Secondary reference
The Walworth Company
820-6015895
5/1Secondary reference
U.S. Government activity
Related Parts
4820-01-240-3346POSSIBLE MATCH
SEAL RING,BONNET,VALVE
5330-01-240-6576POSSIBLE MATCH
PRESSURE SEAL RING
5330-01-240-6577POSSIBLE MATCH
PRESSURE SEAL RING
5330-01-241-6037POSSIBLE MATCH
SEAL RING,METAL
5330-01-242-8934POSSIBLE MATCH
PRESSURE SEAL RING
5330-01-251-1988POSSIBLE MATCH
RETAINER,PACKING
5330-01-251-4743POSSIBLE MATCH
RETAINER,PACKING
5330-01-255-3383POSSIBLE MATCH
RETAINER,PACKING
5330-01-255-7673POSSIBLE MATCH
RETAINER,PACKING
5330-01-257-8052POSSIBLE MATCH
SEAL RING,METAL
5330-01-505-3452POSSIBLE MATCH
RETAINER,PACKING
Frequently Asked Questions
What is NSN 4820-01-240-1380?
NSN 4820-01-240-1380 is a Seal Ring,bonnet,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-240-1380?
11 possible matches (shared part number, not a government interchangeability claim): 4820-01-240-3346, 5330-01-240-6576, 5330-01-240-6577. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-01-240-1380?
Key specifications for 4820-01-240-1380: General Characteristics Item Description: MATERIAL CARB. STEEL,ID 6.145/6.40 IN.,OD 6.893/6.890 INS.,BEVEL ANGLE 41 DEG PORM 30 MIN.,HEIGHT 0.750 PORM 0.016INS.,HARDNESS 80-110 BHN. IN; Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS. 3 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-240-1380 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
What is the DEMIL code for NSN 4820-01-240-1380?
NSN 4820-01-240-1380 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.