The Washer,recessed, cataloged under National Stock Number 5310-01-191-5306, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Hamilton Sundstrand Corporation. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-191-5306 |
| Primary Part Number | 951B922 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Hamilton Sundstrand Corporation |
| Status | ACTIVE |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM |
| Style Designator | RECESSED |
| Outside Diameter | 0.365 INCHES NOMINAL IN |
| Material Thickness | 0.063 INCHES NOMINAL IN |
| Recess Diameter | 0.285 INCHES NOMINAL IN |
| Surface Treatment | OXIDE OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.193 INCHES NOMINAL IN |
| Recess Angle | 45.0 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 |
|---|---|
| 951B92323 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 951B922 PRIMARY | Hamilton Sundstrand Corporation (USA) |
| Reference | Meaning |
|---|---|
| 951B922-1 | 5/9 Secondary reference U.S. Government activity |
| 951B922-1 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-191-5306 is a Washer,recessed, manufactured by Hamilton Sundstrand Corporation, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-191-5306 has 2 manufacturer part numbers on file: 951B92323 (Sps Technologies, Llc Dba PB Fasteners), 951B922 (Hamilton Sundstrand Corporation).
Key specifications for 951B922: Hardness Rating: 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM; Style Designator: RECESSED; Outside Diameter: 0.365 INCHES NOMINAL IN; Material Thickness: 0.063 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.