The Washer,recessed, cataloged under National Stock Number 5310-00-307-7013, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Kirkhill, Inc. Dba Kirkhill Inc. Government technical data includes 9 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 | 5310-00-307-7013 |
| Primary Part Number | 4018A4 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Kirkhill, Inc. Dba Kirkhill Inc |
| Status | ACTIVE |
| Style Designator | RECESSED |
| Material Document and Classification | SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.493 INCHES MINIMUM AND 0.508 INCHES MAXIMUM IN |
| Material Thickness | 0.054 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN |
| Recess Diameter | 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL COMP 4130 OVERALL |
| Hole Diameter | 0.280 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN |
| Recess Angle | 90.0 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 |
|---|---|
| 4018A4 PRIMARY | Kirkhill, Inc. Dba Kirkhill Inc (USA) |
NSN 5310-00-307-7013 is a Washer,recessed, manufactured by Kirkhill, Inc. Dba Kirkhill Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-307-7013 has 1 manufacturer part number on file: 4018A4 (Kirkhill, Inc. Dba Kirkhill Inc).
Key specifications for 4018A4: Style Designator: RECESSED; Material Document and Classification: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.493 INCHES MINIMUM AND 0.508 INCHES MAXIMUM IN; Material Thickness: 0.054 INCHES MINIMUM AND 0.074 INCHES MAXIMUM 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.