The Washer,recessed, cataloged under National Stock Number 5310-00-437-8948, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rotair Aerospace Corp. Government technical data includes 9 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-437-8948 |
| Primary Part Number | 204-030-913-5 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rotair Aerospace Corp |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES ALL SURFACES |
| Style Designator | RECESSED |
| Material Document and Classification | QQ-A-225/6,TEMPER T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 2.000 INCHES NOMINAL IN |
| Material Thickness | 0.390 INCHES NOMINAL IN |
| Recess Diameter | 0.725 INCHES MINIMUM AND 0.735 INCHES MAXIMUM IN |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| Hole Diameter | 0.625 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Recess Angle | 90.0 DEGREES NOMINAL |
| 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 |
|---|---|
| 204-030-913-5 | Leonardo Spa Helicopters Division - Production Site (ITA) |
| 204-030-913-5 PRIMARY | Rotair Aerospace Corp (USA) |
| Reference | Meaning |
|---|---|
| 204-030-913-5 | 7/2 Vendor item drawing reference U.S. Government activity |
| 204-030-913-005 | 5/9 Secondary reference U.S. Government activity |
| 204-030-913-5 | 5/9 Secondary reference Alco Machine Co Inc |
NSN 5310-00-437-8948 is a Washer,recessed, manufactured by Rotair Aerospace Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-437-8948 has 2 manufacturer part numbers on file: 204-030-913-5 (Leonardo Spa Helicopters Division - Production Site), 204-030-913-5 (Rotair Aerospace Corp).
Key specifications for 204-030-913-5: Surface Finish: 63.0 MICROINCHES ALL SURFACES; Style Designator: RECESSED; Material Document and Classification: QQ-A-225/6,TEMPER T4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 2.000 INCHES NOMINAL IN. 9 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.