The Washer,flat, cataloged under National Stock Number 5310-01-618-6341, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Naval Air Warfare Ctr Aircraft Div. Government technical data includes 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-618-6341 |
| Primary Part Number | 03311M1320-101 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Naval Air Warfare Ctr Aircraft Div |
| Status | ACTIVE |
| Width Across Flats | 0.50 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-PRF-23377,TY I,CL C2 MIL SPEC 1ST TREATMENT RESPONSE AND MIL-C-5541,CL 3 MIL SPEC 2ND TREATMENT RESPONSE OVERALL |
| Material Document and Classification | QQ-A-250/12 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Surface Treatment | PRIMER AND CHROMATE OVERALL |
| Peripheral Shape Style | SQUARE |
| Material | ALUMINUM ALLOY 7075 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.188 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 |
|---|---|
| 75A325991-2001 | Bae Systems (operations) Limited (GBR) |
| 03311M1320-101 PRIMARY | Naval Air Warfare Ctr Aircraft Div (USA) |
| Reference | Meaning |
|---|---|
| 03311M1320 | D/9 Drawing number reference only Naval Air Warfare Ctr Aircraft Div |
NSN 5310-01-618-6341 is a Washer,flat, manufactured by Naval Air Warfare Ctr Aircraft Div, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-618-6341 has 2 manufacturer part numbers on file: 75A325991-2001 (Bae Systems (operations) Limited), 03311M1320-101 (Naval Air Warfare Ctr Aircraft Div).
5 possible matches (shared part number, not a government interchangeability claim): 5310-01-618-6358, 5310-01-618-6360, 5310-01-618-6381. Verify interchangeability with system specifications before substitution.
Key specifications for 03311M1320-101: Width Across Flats: 0.50 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-PRF-23377,TY I,CL C2 MIL SPEC 1ST TREATMENT RESPONSE AND MIL-C-5541,CL 3 MIL SPEC 2ND TREATMENT RESPONSE OVERALL; Material Document and Classification: QQ-A-250/12 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Special Features: WASHER IS TAPERED FROM .04INCHES THICK AT THE TOP TO .064INCHES THICK AT THE BOTTOM;PROFILE SHAPE IS A TAPERED RECTANGLE IN. 8 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.