The Washer,flat, cataloged under National Stock Number 5310-01-056-5488, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Army, United States Department of the Dba Rock Island Arsenal Jmtc. 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 | 5310-01-056-5488 |
| Primary Part Number | 12012173 |
| Item Name | Washer,flat |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Army, United States Department of the Dba Rock Island Arsenal Jmtc |
| Status | ACTIVE |
| Outside Left Corner Chamfer Angle | 45.0 DEGREES NOMINAL |
| Overall Diameter | 0.980 INCHES MINIMUM AND 0.985 INCHES MAXIMUM IN |
| Material Document and Classification | ASTM-A-108 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Cross-Sectional Shape Style | BLANK RECTANGULAR |
| Peripheral Shape Style | ROUND |
| Material | STEEL COMP 1018 OVERALL |
| Center Hole Shape Style | ROUND |
| Hole Diameter | 0.505 INCHES MINIMUM AND 0.506 INCHES MAXIMUM IN |
| Thickness | 0.120 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 |
|---|---|
| 12012173 PRIMARY | Army, United States Department of the Dba Rock Island Arsenal Jmtc (USA) |
NSN 5310-01-056-5488 is a Washer,flat, manufactured by Army, United States Department of the Dba Rock Island Arsenal Jmtc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-056-5488 has 1 manufacturer part number on file: 12012173 (Army, United States Department of the Dba Rock Island Arsenal Jmtc).
Key specifications for 12012173: Outside Left Corner Chamfer Angle: 45.0 DEGREES NOMINAL; Overall Diameter: 0.980 INCHES MINIMUM AND 0.985 INCHES MAXIMUM IN; Material Document and Classification: ASTM-A-108 ASSN STD ALL MATERIAL RESPONSES OVERALL; Cross-Sectional Shape Style: BLANK RECTANGULAR. 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.