The Washer,flat, cataloged under National Stock Number 5310-01-644-3921, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-644-3921 |
| Primary Part Number | 12421464-006 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Overall Diameter | 49.38 MILLIMETERS MINIMUM AND 50.00 MILLIMETERS MAXIMUM MM |
| Cross-Sectional Shape Style | BLANK RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | PLASTIC POLYHEXAMETHYLENE ADIPAMIDE OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 16.99 MILLIMETERS MINIMUM AND 17.27 MILLIMETERS MAXIMUM MM |
| Thickness | 2.7 MILLIMETERS MINIMUM AND 3.3 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| 12421464-006 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| 17M16DIN34816 | Micro Plastics Inc (USA) |
| Reference | Meaning |
|---|---|
| 12421464 | D/9 Drawing number reference only U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 5310-01-644-3921 is a Washer,flat, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-644-3921 has 2 manufacturer part numbers on file: 12421464-006 (U S Army Tank Automotive Command Amsta-Im-Mm), 17M16DIN34816 (Micro Plastics Inc).
Key specifications for 12421464-006: Overall Diameter: 49.38 MILLIMETERS MINIMUM AND 50.00 MILLIMETERS MAXIMUM MM; Cross-Sectional Shape Style: BLANK RECTANGULAR; Peripheral Shape Style: ROUND; Part Name Assigned by Controlling Agency: WASHER FLAT NYLON. 7 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.