The O-Ring, cataloged under National Stock Number 5331-01-388-3987, 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 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5331-01-388-3987 |
| Primary Part Number | MS9021D-020 |
| 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 Document and Classification | AMS7271-80 ASSN STD SINGLE MATERIAL RESPONSE |
| Center Hole Diameter | 0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN |
| Material | RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR |
| Cross-Sectional Height | 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS9021D-020 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| AS3578-020 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MS9021-020 | Zf Industrieantriebe Witten Gmbh (DEU) |
| SAE-AS3578 | Sae International Dba Sae International (USA) |
NSN 5331-01-388-3987 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 5331-01-388-3987 has 4 cross-referenced part numbers: MS9021D-020 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), AS3578-020 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MS9021-020 (Zf Industrieantriebe Witten Gmbh), SAE-AS3578 (Sae International Dba Sae International).
There are 2 known substitutes for 5331-01-388-3987: 5331-00-551-8250, 5331-01-015-3371. Verify interchangeability with system specifications before substitution.
Key specifications for MS9021D-020: Material Document and Classification: AMS7271-80 ASSN STD SINGLE MATERIAL RESPONSE; Center Hole Diameter: 0.858 INCHES MINIMUM AND 0.870 INCHES MAXIMUM IN; Material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR; Cross-Sectional Height: 0.067 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN. 4 total characteristics are documented in the Federal Logistics Information System.