The Washer,concave, cataloged under National Stock Number 5310-01-115-2556, 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 10 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-115-2556 |
| Primary Part Number | KFN619B8 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Radius | 0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN |
| Style Designator | CONCAVE |
| Material Document and Classification | AMS 5643,COND H1025 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.465 INCHES MINIMUM AND 0.475 INCHES MAXIMUM IN |
| Recess Depth | 0.055 INCHES MINIMUM AND 0.065 INCHES MAXIMUM IN |
| Material Thickness | 0.110 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL COMP 630 OVERALL |
| Hole Diameter | 0.314 INCHES NOMINAL 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 |
|---|---|
| KFN619B8 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
NSN 5310-01-115-2556 is a Washer,concave, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-115-2556 has 1 manufacturer part number on file: KFN619B8 (Howmet Global Fastening Systems Inc).
Key specifications for KFN619B8: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Radius: 0.250 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN; Style Designator: CONCAVE; Material Document and Classification: AMS 5643,COND H1025 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 10 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.