The Washer,key, cataloged under National Stock Number 5310-01-143-5050, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-143-5050 |
| Primary Part Number | BACW10BW52 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES BOTTOM |
| Surface Finish | 63.0 MICROINCHES TOP |
| Internal Straight Key Width | 0.290 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.935 INCHES MINIMUM AND 0.955 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | DOD-P-16232,TY Z,CL 4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Overall Distance Including Keys | 3.037 INCHES MINIMUM AND 3.057 INCHES MAXIMUM IN |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 36.0 ROCKWELL C MAXIMUM |
| Style Designator | KEY |
| Material Document and Classification | MIL-S-18729 MIL SPEC 1ST MATERIAL RESPONSE OR AMS 6415 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Outside Diameter | 2.837 INCHES MINIMUM AND 2.857 INCHES MAXIMUM IN |
| Material Thickness | 0.046 INCHES MINIMUM AND 0.054 INCHES MAXIMUM IN |
| External Straight Key Width | 0.150 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN |
| External Key Quantity | 4 |
| Surface Treatment | PHOSPHATE OVERALL |
| Material | STEEL COMP 4130 OR STEEL COMP 4340 OVERALL |
| Internal Key Quantity | 2 |
| Hole Diameter | 2.280 INCHES MINIMUM AND 2.300 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 |
|---|---|
| BACW10BW52 PRIMARY | The Boeing Company (USA) |
| Reference | Meaning |
|---|---|
| BACW10BW52 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5310-01-143-5050 is a Washer,key, manufactured by The Boeing Company, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-143-5050 has 1 manufacturer part number on file: BACW10BW52 (The Boeing Company).
Key specifications for BACW10BW52: Surface Finish: 63.0 MICROINCHES BOTTOM; Surface Finish: 63.0 MICROINCHES TOP; Internal Straight Key Width: 0.290 INCHES MINIMUM AND 0.300 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.935 INCHES MINIMUM AND 0.955 INCHES MAXIMUM IN. 17 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.