The Bearing,plain,self-Aligning, cataloged under National Stock Number 3120-00-079-9974, is classified within Federal Supply Class 3120 (No Item Name Available) of the Bearings 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 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 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 | 3120-00-079-9974 |
| Primary Part Number | MS21231-5 |
| Item Name | Bearing,plain,self-Aligning |
| FSC / FSG | 3120 / 31 — No Item Name Available |
| Manufacturer | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| Status | ACTIVE |
| Bore Diameter | 0.3120 INCHES MINIMUM AND 0.3125 INCHES MAXIMUM IN |
| Outer Member Outside Diameter | 0.6870 INCHES MINIMUM AND 0.6875 INCHES MAXIMUM IN |
| Hardness Rating | 23.0 ROCKWELL C MINIMUM OUTER RACE MEMBER |
| Material | STEEL COMP 440C INNER MEMBER |
| Style Designator | WITHOUT INSERT OR LINER |
| Hardness Rating | 55.0 ROCKWELL C MINIMUM INNER MEMBER |
| Material | STEEL OUTER RACE MEMBER |
| Outer Member Width | 0.3120 INCHES MINIMUM AND 0.3220 INCHES MAXIMUM IN |
| Inner Member Width | 0.4350 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM IN |
| Static Radial Load Rating | 9400 POUNDS LBS |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
| Part Number | Manufacturer |
|---|---|
| MS21231-5 | Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M |
| MILB8942 | Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M |
NSN 3120-00-079-9974 is a Bearing,plain,self-Aligning, manufactured by Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 3120 (No Item Name Available). Status: active.
NSN 3120-00-079-9974 has 2 cross-referenced part numbers: MS21231-5 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), MILB8942 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).
There are 2 known substitutes for 3120-00-079-9974: 3120-01-054-4693, 3120-01-364-3681. Verify interchangeability with system specifications before substitution.
Key specifications for MS21231-5: Bore Diameter: 0.3120 INCHES MINIMUM AND 0.3125 INCHES MAXIMUM IN; Outer Member Outside Diameter: 0.6870 INCHES MINIMUM AND 0.6875 INCHES MAXIMUM IN; Hardness Rating: 23.0 ROCKWELL C MINIMUM OUTER RACE MEMBER; Material: STEEL COMP 440C INNER MEMBER. 10 total characteristics are documented in the Federal Logistics Information System.