The Washer,flat, cataloged under National Stock Number 5310-01-643-5570, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is M.s. Aerospace Inc. Dba Ms Aerospace Inc. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-643-5570 |
| Primary Part Number | MSA0421C12 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | M.s. Aerospace Inc. Dba Ms Aerospace Inc |
| Status | ACTIVE |
| Peripheral Shape Style | ROUND |
| Center Hole Shape Style | ROUND |
| 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 |
|---|---|
| MSA0421C12 PRIMARY | M.s. Aerospace Inc. Dba Ms Aerospace Inc (USA) |
| Reference | Meaning |
|---|---|
| MSA0421C12 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-01-643-5570 is a Washer,flat, manufactured by M.s. Aerospace Inc. Dba Ms Aerospace Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-643-5570 has 1 manufacturer part number on file: MSA0421C12 (M.s. Aerospace Inc. Dba Ms Aerospace Inc).
Key specifications for MSA0421C12: Special Features: MATERIAL IS UNS R30159 PER AMS 5842; HEAT TREAT 44 HRC MIN; PASSIVATE PER AMS QQ-P-35; Peripheral Shape Style: ROUND; Part Name Assigned by Controlling Agency: WASHER, PLAIN AND COUNTERSUNK; Center Hole Shape Style: ROUND. 2 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.