The Washer,flat, cataloged under National Stock Number 5310-01-220-6520, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is K & L Precision Plastics Inc Div K & L Prescison Plastics, Inc.. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-220-6520 |
| Primary Part Number | 4M116-04007 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | K & L Precision Plastics Inc Div K & L Prescison Plastics, Inc. |
| Status | ACTIVE |
| Overall Diameter | 0.615 INCHES MINIMUM AND 0.645 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-P-18177 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Cross-Sectional Shape Style | RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC EPOXY AND GLASS OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.400 INCHES MINIMUM AND 0.420 INCHES MAXIMUM IN |
| Thickness | 0.019 INCHES MINIMUM AND 0.030 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 |
|---|---|
| 4M116-04007 PRIMARY | K & L Precision Plastics Inc Div K & L Prescison Plastics, Inc. (USA) |
| 4M116-04007 | Moeller Manufacturing & Supply, Llc (USA) |
| 4M116-04007 | Anillo Industries Llc (USA) |
| 4M116-04007 | Indiana Aircraft Hardware, Inc. (USA) |
| 4M116-04007 | Aero-Plastics, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 4M116-04007 | 5/9 Secondary reference The Boeing Company Div Defense |
| 10110174 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 4M116-04007 | C/1 Advisory reference — outside the item-of-supply concept Plastifab, Inc. Dba Plastifab Leed Plastics Div Plasifab Inc. |
| 4M116-04007 | 5/9 Secondary reference Jetron Inc |
| 4M116-04007 | 5/9 Secondary reference Plastifab Incorporated |
NSN 5310-01-220-6520 is a Washer,flat, manufactured by K & L Precision Plastics Inc Div K & L Prescison Plastics, Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-220-6520 has 5 manufacturer part numbers on file: 4M116-04007 (K & L Precision Plastics Inc Div K & L Prescison Plastics, Inc.), 4M116-04007 (Moeller Manufacturing & Supply, Llc), 4M116-04007 (Anillo Industries Llc), 4M116-04007 (Indiana Aircraft Hardware, Inc.), 4M116-04007 (Aero-Plastics, Inc.).
Key specifications for 4M116-04007: Overall Diameter: 0.615 INCHES MINIMUM AND 0.645 INCHES MAXIMUM IN; Material Document and Classification: MIL-P-18177 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL; Cross-Sectional Shape Style: RECTANGULAR; Peripheral Shape Style: ROUND. 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.