The Washer,recessed, cataloged under National Stock Number 5310-00-558-9500, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-558-9500 |
| Primary Part Number | 254518 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Style Designator | RECESSED |
| Material Document and Classification | AMS 5665 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN |
| Recess Depth | 0.045 INCHES NOMINAL IN |
| Material Thickness | 0.090 INCHES NOMINAL IN |
| Recess Diameter | 0.300 INCHES MINIMUM AND 0.320 INCHES MAXIMUM IN |
| Material | NICKEL OVERALL |
| Hole Diameter | 0.255 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Recess Angle | 60.0 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 |
|---|---|
| 254518 | Trego Inc (USA) |
| 254518 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| 254518 | 5/9 Secondary reference Cooper Industries Inc Cooper Petroleum Equipment Div Sunnyvale Operation |
| 254518 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
NSN 5310-00-558-9500 is a Washer,recessed, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-558-9500 has 2 manufacturer part numbers on file: 254518 (Trego Inc), 254518 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 254518: Overall Height: 0.085 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN; Style Designator: RECESSED; Material Document and Classification: AMS 5665 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.440 INCHES MINIMUM AND 0.460 INCHES MAXIMUM 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.