The O-Ring, cataloged under National Stock Number 5331-01-388-3989, is classified within Federal Supply Class 5331 (O-Ring) of the Hardware and Abrasives group. The primary manufacturer of record is Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-388-3989 |
| Primary Part Number | MS9021D-018 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-Ring |
| Manufacturer | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| Status | ACTIVE |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR |
| Center Hole Diameter | 0.734 INCHES MINIMUM AND 0.744 INCHES MAXIMUM IN |
| Cross-Sectional Height | 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Material Document and Classification | AMS7271-80 ASSN STD SINGLE MATERIAL RESPONSE |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS9021D-018 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS9021-018 | Zf Industrieantriebe Witten Gmbh (DEU) |
| 5331PL1527417 | Jednolity Indeks Materialowy - Uniform Material Index (POL) |
NSN 5331-01-388-3989 is a O-Ring, manufactured by Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5331 (O-Ring). Status: active.
NSN 5331-01-388-3989 has 3 cross-referenced part numbers: MS9021D-018 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MS9021-018 (Zf Industrieantriebe Witten Gmbh), 5331PL1527417 (Jednolity Indeks Materialowy - Uniform Material Index).
There is 1 known substitute for 5331-01-388-3989: 5331-00-690-9743. Verify interchangeability with system specifications before substitution.
Key specifications for MS9021D-018: Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR; Center Hole Diameter: 0.734 INCHES MINIMUM AND 0.744 INCHES MAXIMUM IN; Cross-Sectional Height: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN; Material Document and Classification: AMS7271-80 ASSN STD SINGLE MATERIAL RESPONSE. 4 total characteristics are documented in the Federal Logistics Information System.