NSN 5331-00-817-5991 · NIIN 008175991 · Part number 26768
Triumph Thermal Systems - Maryland, Inc. · FSC 5331 — O-ring · FSG 53 — Hardware and Abrasives · CAGE 01359
Government record, cited
NSN 5331-00-817-5991 — this item is cataloged by the U.S. Government under National Stock Number 5331-00-817-5991. Manufacturer of record part number: 26768.
Manufacturer of record: Triumph Thermal Systems - Maryland, Inc.
Identification
NSN: 5331-00-817-5991
NIIN: 008175991
FSC: 5331 — O-ring
FSG: 53 — Hardware and Abrasives
Primary part number: 26768
Manufacturer: Triumph Thermal Systems - Maryland, Inc.
General Description
The O-Ring, cataloged under National Stock Number 5331-00-817-5991, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Triumph Thermal Systems - Maryland, Inc.. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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
5331-00-817-5991
Primary Part Number
26768
Item Name
O-Ring
FSC / FSG
5331 / 53 — O-ring
Manufacturer
Triumph Thermal Systems - Maryland, Inc.
Status
ACTIVE
Cross-Sectional Height
0.062 INCHES NOMINAL IN
Material
RUBBER SYNTHETIC
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items2
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5950-00-951-157526768POSSIBLE MATCH
TRANSFORMER,RADIO FREQUENCY
Possible match (shared part number)Torotel, Inc. Div Torotel Products, Inc.
6150-01-598-9680295132-1POSSIBLE MATCH
CABLE ASSEMBLY,SPECIAL PURPOSE,E
Possible match (shared part number)Cubic Defense Applications, Inc.
NSN 5331-00-817-5991 is a O-Ring, manufactured by Triumph Thermal Systems - Maryland, Inc., classified under FSC 5331, O-ring. Status: active.
What part numbers are listed for NSN 5331-00-817-5991?
NSN 5331-00-817-5991 has 2 manufacturer part numbers on file: SS3818-11 (Triumph Thermal Systems - Maryland, Inc.), 26768 (Triumph Thermal Systems - Maryland, Inc.).
What NSN replaces 5331-00-817-5991?
2 possible matches (shared part number, not a government interchangeability claim): 5950-00-951-1575, 6150-01-598-9680. Verify interchangeability with system specifications before substitution.
What are the specifications of 26768?
Key specifications for 26768: Cross-Sectional Height: 0.062 INCHES NOMINAL IN; Material: RUBBER SYNTHETIC. 2 specifications are documented in the U.S. Government catalog.
Is NSN 5331-00-817-5991 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.