NSN 4820-01-646-6539 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-646-6539. Manufacturer of record part number: USHSSMT4.00SS.
Also searched as4820-01-646-6539 ·
4820016466539 ·
NIIN 016466539 ·
01-646-6539 ·
FSC 4820 Valves, Nonpowered · CAGE 28396 · USHSSMT4.00SS
Connection Type: UNTHREADED INTERNAL PIPE ALL ENDS
Style Designator: STRAIGHT THRU
Valve Size: 1.000 INCHES IN
Face to Face Distance: 3.640 INCHES IN
Material: STEEL COMP 316 OR STEEL COMP 316L OVERALL
Valve Operation Method: AUTOMATIC
1 manufacturer part number on file
Identification
NSN: 4820-01-646-6539
NIIN: 016466539
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: USHSSMT4.00SS
Manufacturer: International Valve Corp Dba Check-All Valve Mfg. Co.
General Description
The Valve,check, cataloged under National Stock Number 4820-01-646-6539, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is International Valve Corp Dba Check-All Valve Mfg. Co.. Government technical data includes 6 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
4820-01-646-6539
Primary Part Number
USHSSMT4.00SS
Item Name
Valve,check
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
International Valve Corp Dba Check-All Valve Mfg. Co.
International Valve Corp Dba Check-All Valve Mfg. Co. (USA)
No interchangeability data on file.
Other items in FSC 4820 — Valves, Nonpowered
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 4820-01-646-6539?
NSN 4820-01-646-6539 is a Valve,check, manufactured by International Valve Corp Dba Check-All Valve Mfg. Co., classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-646-6539?
NSN 4820-01-646-6539 has 1 manufacturer part number on file: USHSSMT4.00SS (International Valve Corp Dba Check-All Valve Mfg. Co.).
What are the specifications of USHSSMT4.00SS?
Key specifications for USHSSMT4.00SS: Connection Type: UNTHREADED INTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU; Valve Size: 1.000 INCHES IN; Face to Face Distance: 3.640 INCHES IN. 6 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-646-6539 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.