The Washer,key, cataloged under National Stock Number 5310-01-013-4423, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Pht Aerospace Llc. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-013-4423 |
| Primary Part Number | 175WK398 |
| Item Name | Washer,key |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Pht Aerospace Llc |
| Status | ACTIVE |
| Internal Straight Key Width | 0.088 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN |
| Distance From Centerline to Top of Internal Key | 0.167 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN |
| Overall Distance Including Keys | 0.730 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN |
| Style Designator | KEY |
| Material Document and Classification | MIL-S-18729 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.560 INCHES MINIMUM AND 0.570 INCHES MAXIMUM IN |
| Material Thickness | 0.040 INCHES NOMINAL IN |
| External Straight Key Width | 0.080 INCHES NOMINAL IN |
| External Key Quantity | 11 |
| Surface Treatment | TIN OVERALL |
| Material | STEEL COMP 4130 OVERALL |
| Internal Key Quantity | 1 |
| Hole Diameter | 0.404 INCHES MINIMUM AND 0.445 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 |
|---|---|
| 175WK398 PRIMARY | Pht Aerospace Llc (USA) |
| Reference | Meaning |
|---|---|
| 1590141-2 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-013-4423 is a Washer,key, manufactured by Pht Aerospace Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-013-4423 has 1 manufacturer part number on file: 175WK398 (Pht Aerospace Llc).
Key specifications for 175WK398: Internal Straight Key Width: 0.088 INCHES MINIMUM AND 0.092 INCHES MAXIMUM IN; Distance From Centerline to Top of Internal Key: 0.167 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN; Overall Distance Including Keys: 0.730 INCHES MINIMUM AND 0.740 INCHES MAXIMUM IN; Style Designator: KEY. 13 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.