NSN 4820-01-423-7660 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-423-7660. Manufacturer of record part number: 94-D-285 1/2IN.
Nominal Pipe Size Accommodated: 0.500 INCHES ALL ENDS IN
Connection Style: SOCKET WITH BRAZING RING ALL ENDS
Connection Type: UNTHREADED INTERNAL PIPE ALL ENDS
Style Designator: ANGLE
Operating Pressure: 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Maximum Operating Temp: 166.0 FAHRENHEIT SINGLE RESPONSE DEGF
Disk Loading Method: SPRING
Identification
NSN: 4820-01-423-7660
NIIN: 014237660
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 94-D-285 1/2IN
Manufacturer: Derbyshire Machine & Tool Co
General Description
The Valve,safety Relief, cataloged under National Stock Number 4820-01-423-7660, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4820-01-423-7660
Primary Part Number
94-D-285 1/2IN
Item Name
Valve,safety Relief
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Derbyshire Machine & Tool Co
Status
ACTIVE
Nominal Pipe Size Accommodated
0.500 INCHES ALL ENDS IN
Connection Style
SOCKET WITH BRAZING RING ALL ENDS
Connection Type
UNTHREADED INTERNAL PIPE ALL ENDS
Style Designator
ANGLE
Operating Pressure
400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4820-00-000-0097
4820-00-000-0097 · Item name not on file
4820-00-001-0010
VALVE,ROTARY,SELECTOR
4820-00-001-0020
4820-00-001-0020 · Item name not on file
4820-00-001-0021
4820-00-001-0021 · Item name not on file
4820-00-001-0032
4820-00-001-0032 · Item name not on file
4820-00-001-0037
VALVE,SAFETY RELIEF
4820-00-001-0042
4820-00-001-0042 · Item name not on file
4820-00-001-1230
4820-00-001-1230 · Item name not on file
Frequently Asked Questions
What is NSN 4820-01-423-7660?
NSN 4820-01-423-7660 is a Valve,safety Relief, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-423-7660?
NSN 4820-01-423-7660 has 1 manufacturer part number on file: 94-D-285 1/2IN (Derbyshire Machine & Tool Co).
What are the specifications of 94-D-285 1/2IN?
Key specifications for 94-D-285 1/2IN: Nominal Pipe Size Accommodated: 0.500 INCHES ALL ENDS IN; Connection Style: SOCKET WITH BRAZING RING ALL ENDS; Connection Type: UNTHREADED INTERNAL PIPE ALL ENDS; Style Designator: ANGLE. 12 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-423-7660 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.
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.