The Washer,spring Tension, cataloged under National Stock Number 5310-01-503-3805, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Am Machining, Inc. Dba Am Machining Inc Div Apv Manufacturing & Engineering Co.. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-503-3805 |
| Primary Part Number | 13D0021-051 |
| Item Name | Washer,spring Tension |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Am Machining, Inc. Dba Am Machining Inc Div Apv Manufacturing & Engineering Co. |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Style Designator | SPRING TENSION |
| Outside Diameter | 0.420 INCHES NOMINAL IN |
| Material Thickness | 0.020 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 301 OR STEEL COMP 302 OR STEEL COMP 304 OVERALL |
| Hole Diameter | 0.190 INCHES MINIMUM AND 0.200 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 |
|---|---|
| 13D0021-051 PRIMARY | Am Machining, Inc. Dba Am Machining Inc Div Apv Manufacturing & Engineering Co. (USA) |
| 13D0021-051 PRIMARY | Buena Park Tool & Engineering, Inc Dba Buena Park Tool (USA) |
| 13D0021-051 PRIMARY | American Metals & Machining (USA) |
| Reference | Meaning |
|---|---|
| 13D0021-051 | 3/2 Design control — primary reference U.S. Government activity |
| 13D0021-051 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-503-3805 is a Washer,spring Tension, manufactured by Am Machining, Inc. Dba Am Machining Inc Div Apv Manufacturing & Engineering Co., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-503-3805 has 3 manufacturer part numbers on file: 13D0021-051 (Am Machining, Inc. Dba Am Machining Inc Div Apv Manufacturing & Engineering Co.), 13D0021-051 (Buena Park Tool & Engineering, Inc Dba Buena Park Tool), 13D0021-051 (American Metals & Machining).
Key specifications for 13D0021-051: Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Style Designator: SPRING TENSION; Outside Diameter: 0.420 INCHES NOMINAL IN; Material Thickness: 0.020 INCHES NOMINAL IN. 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.