The Washer,concave, cataloged under National Stock Number 5310-00-221-7434, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-221-7434 |
| Primary Part Number | K19301-4 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Radius | 0.312 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Heat Treatment | AS FABRICATED |
| Style Designator | CONCAVE |
| Material Document and Classification | AMS 6370 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.470 INCHES MINIMUM AND 0.480 INCHES MAXIMUM IN |
| Material Thickness | 0.096 INCHES MINIMUM AND 0.100 INCHES MAXIMUM IN |
| Recess Diameter | 0.410 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN |
| Material | STEEL COMP 4130 OVERALL |
| Hole Diameter | 0.331 INCHES MINIMUM AND 0.336 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 |
|---|---|
| K19301-4 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| 9689M13P01 | General Electric Company (USA) |
| Reference | Meaning |
|---|---|
| K19301-4 | 3/9 Design control — primary reference Metalstand Co |
NSN 5310-00-221-7434 is a Washer,concave, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-221-7434 has 2 manufacturer part numbers on file: K19301-4 (Howmet Global Fastening Systems Inc), 9689M13P01 (General Electric Company).
1 possible match (shared part number, not a government interchangeability claim): 5310-00-881-1706. Verify interchangeability with system specifications before substitution.
Key specifications for K19301-4: Radius: 0.312 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN; Heat Treatment: AS FABRICATED; Style Designator: CONCAVE; Material Document and Classification: AMS 6370 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.