The Washer,concave, cataloged under National Stock Number 5310-01-623-8310, 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 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5310-01-623-8310 |
| Primary Part Number | 12529191 |
| Item Name | Washer,concave |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Style Designator | SPRING TENSION |
| Outside Diameter | 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Material Thickness | 0.025 INCHES NOMINAL IN |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| Material | STEEL COMP 1074 OVERALL |
| Hole Diameter | 0.765 INCHES MINIMUM AND 0.775 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 |
|---|---|
| 12529191 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 5804-356-2-Z2 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-623-8310 is a Washer,concave, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-623-8310 has 1 manufacturer part number on file: 12529191 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12529191: Overall Height: 0.172 INCHES MINIMUM AND 0.202 INCHES MAXIMUM IN; Style Designator: SPRING TENSION; Outside Diameter: 1.240 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN; Material Thickness: 0.025 INCHES NOMINAL IN. 6 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.