The Washer,key, cataloged under National Stock Number 5310-00-121-8012, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 12 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-121-8012 |
| Primary Part Number | MS9581-09 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Distance From Centerline to Inside of Prebent Key | 0.221 INCHES MINIMUM AND 0.231 INCHES MAXIMUM IN |
| External Prebent Key Length | 0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN |
| Style Designator | 90 DEGREE LOCKING KEY |
| Material Document and Classification | AMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.195 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN |
| External Tapered Key Width | 0.200 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN |
| Material Thickness | 0.019 INCHES MINIMUM AND 0.025 INCHES MAXIMUM IN |
| External Prebent Key Angle | 15.0 DEGREES NOMINAL |
| External Prebent Key Width | 0.110 INCHES MINIMUM AND 0.115 INCHES MAXIMUM IN |
| Material | STEEL COMP 321 OVERALL |
| Angle Between External Keys | 58.0 DEGREES MINIMUM AND 62.0 DEGREES MAXIMUM |
| Hole Diameter | 0.190 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MS9581-09 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| MS9581-09 | 5/9 Secondary reference U.S. Government activity |
| MS9581-09 | 3/9 Design control — primary reference U.S. Government activity |
| SAE AS9581 | 5/9 Secondary reference U.S. Government activity |
| SAE AS9581 | 5/1 Secondary reference Sae International Dba Sae International |
NSN 5310-00-121-8012 is a Washer,key, manufactured by Sae International Dba Sae International, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-121-8012 has 1 manufacturer part number on file: MS9581-09 (Sae International Dba Sae International).
Key specifications for MS9581-09: Distance From Centerline to Inside of Prebent Key: 0.221 INCHES MINIMUM AND 0.231 INCHES MAXIMUM IN; External Prebent Key Length: 0.095 INCHES MINIMUM AND 0.105 INCHES MAXIMUM IN; Style Designator: 90 DEGREE LOCKING KEY; Material Document and Classification: AMS 5510 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 12 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.