The Washer,lock, cataloged under National Stock Number 5310-00-058-7988, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Allmetal Screw Products Corp. Government technical data includes 9 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 9 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Cancelled.
| Parameter | Value |
|---|---|
| NSN | 5310-00-058-7988 |
| Primary Part Number | 310-0281-000 |
| Item Name | Washer,lock |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Allmetal Screw Products Corp |
| Status | CANCELLED |
| Style Designator | SPLIT HELICAL-RIGHT HAND |
| Material Document and Classification | QQ-S-763 CL 1 COND C FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Outside Diameter | 0.239 INCHES MAXIMUM IN |
| Material Thickness | 0.031 INCHES NOMINAL IN |
| Departure From Cited Document | AS MODIFIED BY MATERIAL |
| Nondefinitive Spec/std Data | C CLASS AND 2 STYLE |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL COMP 304 OVERALL |
| Hole Diameter | 0.128 INCHES MINIMUM AND 0.137 INCHES MAXIMUM IN |
| Acquisition Status | CANCELLED |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 587988 | Army Weapons Command Attn Amswe-Ree-S (USA) |
| 310-0281-000 PRIMARY | Allmetal Screw Products Corp (USA) |
| 10516554 | Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate (USA) |
| Reference | Meaning |
|---|---|
| FFW84CLASSCSTYLE2 | 4/1 Identification reference U.S. Government activity |
| 310-0281-00 | C/1 Advisory reference — outside the item-of-supply concept Rockwell Collins, Inc. Dba Collins Aerospace Government Systems Div Collins Aerospace - Government Systems |
| N406P6 | 3/2 Design control — primary reference U.S. Government activity |
| 3120000587988 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
| 93621-6 | 5/9 Secondary reference Lockheed Martin Corporation Dba Lockheed Martin Div Lockheed Martin |
| 93621-6 | 5/9 Secondary reference Rca Corp Distributor and Special Products Div |
| ASAB27-1-1950LIGHTSERIES | 3/1 Design control — primary reference U.S. Government activity |
NSN 5310-00-058-7988 is a Washer,lock, manufactured by Allmetal Screw Products Corp, classified under FSC 5310, Nuts and Washers. Status: cancelled.
NSN 5310-00-058-7988 has 3 manufacturer part numbers on file: 587988 (Army Weapons Command Attn Amswe-Ree-S), 310-0281-000 (Allmetal Screw Products Corp), 10516554 (Combat Capabilities Development Command (ccdc) Armaments Center Dba Ccdc Div Logistics Research and Engineering Directorate).
9 possible matches (shared part number, not a government interchangeability claim): 5310-00-081-4476, 5310-00-081-4478, 5310-00-081-4480. Verify interchangeability with system specifications before substitution.
Key specifications for 310-0281-000: Style Designator: SPLIT HELICAL-RIGHT HAND; Material Document and Classification: QQ-S-763 CL 1 COND C FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Outside Diameter: 0.239 INCHES MAXIMUM IN; Material Thickness: 0.031 INCHES NOMINAL IN. 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.
NSN 5310-00-058-7988 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.
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.