The Washer,key, cataloged under National Stock Number 5310-01-052-9164, 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 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-052-9164 |
| Primary Part Number | M81935/3-6 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Wire Hole Diameter | 0.062 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Internal Prebent Key Width | 0.081 INCHES MINIMUM AND 0.091 INCHES MAXIMUM IN |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM |
| Style Designator | INTERNAL PREBENT KEY |
| Material Document and Classification | MIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OR SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.560 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN |
| Material Thickness | 0.060 INCHES NOMINAL IN |
| Specification/standard Data | 81349-MIL-B-81935/3 GOVERNMENT SPECIFICATION |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL COMP 4130 OVERALL |
| Hole Diameter | 0.381 INCHES MINIMUM AND 0.391 INCHES MAXIMUM 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 |
|---|---|
| M81935/3-6 PRIMARY | Sae International Dba Sae International (USA) |
| MS81935/3-6 | Barlow Metal Stamping, Inc. (USA) |
| 4M269-6 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 10122059 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| MIL-B-81935/3 | 5/9 Secondary reference U.S. Government activity |
| M81935/3-6 | 5/9 Secondary reference U.S. Government activity |
| 5310PL0153150 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| SAE-AS81935/3 | 3/1 Design control — primary reference Sae International Dba Sae International |
| 754/7/36518/000 | C/1 Advisory reference — outside the item-of-supply concept Eaton Limited |
NSN 5310-01-052-9164 is a Washer,key, manufactured by Sae International Dba Sae International, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-052-9164 has 3 manufacturer part numbers on file: M81935/3-6 (Sae International Dba Sae International), MS81935/3-6 (Barlow Metal Stamping, Inc.), 4M269-6 (The Boeing Company Div Defense).
4 possible matches (shared part number, not a government interchangeability claim): 5310-01-055-3857, 5310-01-066-6766, 5310-01-070-2113. Verify interchangeability with system specifications before substitution.
Key specifications for M81935/3-6: Wire Hole Diameter: 0.062 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Internal Prebent Key Width: 0.081 INCHES MINIMUM AND 0.091 INCHES MAXIMUM IN; Hardness Rating: 35.0 ROCKWELL C MINIMUM AND 39.0 ROCKWELL C MAXIMUM. 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.