The Washer,recessed, cataloged under National Stock Number 5310-00-066-9409, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems. Government technical data includes 12 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 | 5310-00-066-9409 |
| Primary Part Number | 135B6130 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems |
| Status | ACTIVE |
| Top Recess Diameter | 1.375 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-STD-171 MIL STD SINGLE TREATMENT RESPONSE OVERALL |
| Bottom Recess Diameter | 1.375 INCHES NOMINAL IN |
| Heat Treatment | AS FABRICATED |
| Top Recess Angle | 90.0 DEGREES NOMINAL |
| Style Designator | RECESSED BOTH SIDES |
| Outside Diameter | 3.970 INCHES MINIMUM AND 4.030 INCHES MAXIMUM IN |
| Material Thickness | 0.520 INCHES MINIMUM AND 0.580 INCHES MAXIMUM IN |
| Bottom Recess Angle | 90.0 DEGREES NOMINAL |
| Surface Treatment | OXIDE FILM OVERALL |
| Material | ALUMINUM ALLOY OVERALL |
| Hole Diameter | 1.250 INCHES MINIMUM AND 1.310 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 |
|---|---|
| 135B6130 PRIMARY | General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems (USA) |
NSN 5310-00-066-9409 is a Washer,recessed, manufactured by General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-066-9409 has 1 manufacturer part number on file: 135B6130 (General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems).
Key specifications for 135B6130: Top Recess Diameter: 1.375 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-STD-171 MIL STD SINGLE TREATMENT RESPONSE OVERALL; Bottom Recess Diameter: 1.375 INCHES NOMINAL IN; Heat Treatment: AS FABRICATED. 12 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.