The Washer,recessed, cataloged under National Stock Number 5310-00-087-4908, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Atk Launch Systems Llc Dba Atk Launch Systems-Promontory Div Propulsion Systems - Promontory. Government technical data includes 8 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 | 5310-00-087-4908 |
| Primary Part Number | U31608-01 |
| Item Name | Washer,recessed |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Atk Launch Systems Llc Dba Atk Launch Systems-Promontory Div Propulsion Systems - Promontory |
| Status | ACTIVE |
| Heat Treatment | AS FABRICATED |
| Style Designator | RECESSED |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Material Thickness | 0.208 INCHES MINIMUM AND 0.228 INCHES MAXIMUM IN |
| Recess Diameter | 0.750 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL OVERALL |
| Hole Diameter | 0.405 INCHES MINIMUM AND 0.412 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 |
|---|---|
| U31608-01 PRIMARY | Atk Launch Systems Llc Dba Atk Launch Systems-Promontory Div Propulsion Systems - Promontory (USA) |
NSN 5310-00-087-4908 is a Washer,recessed, manufactured by Atk Launch Systems Llc Dba Atk Launch Systems-Promontory Div Propulsion Systems - Promontory, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-087-4908 has 1 manufacturer part number on file: U31608-01 (Atk Launch Systems Llc Dba Atk Launch Systems-Promontory Div Propulsion Systems - Promontory).
Key specifications for U31608-01: Heat Treatment: AS FABRICATED; Style Designator: RECESSED; Material Document and Classification: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL; Material Thickness: 0.208 INCHES MINIMUM AND 0.228 INCHES MAXIMUM IN. 8 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.