The Seat,valve, cataloged under National Stock Number 4820-00-840-4664, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. 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 | 4820-00-840-4664 |
| Primary Part Number | 8356291 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Body Outside Diameter | 0.877 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN |
| Hardness Rating | 15.0 ROCKWELL SUPERFICIAL 15-N NOMINAL BODY |
| Hardness Rating | 15.0 ROCKWELL SUPERFICIAL 15-N NOMINAL FACE |
| Style Designator | PLAIN |
| Material Document and Classification | QQ-S-633 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 0.607 INCHES MINIMUM AND 0.617 INCHES MAXIMUM IN |
| Material | STEEL COMP 1111 OR STEEL COMP 1112 OR STEEL COMP 1113 OR STEEL COMP 1114 OR STEEL COMP 1115 OR STEEL COMP 1116 OR STEEL COMP 1117 OVERALL |
| Seating Surface Shape | FLAT |
| 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 |
|---|---|
| 8356291 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 4820-00-840-4664 is a Seat,valve, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-840-4664 has 1 manufacturer part number on file: 8356291 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 8356291: Overall Height: 0.250 INCHES NOMINAL IN; Body Outside Diameter: 0.877 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN; Hardness Rating: 15.0 ROCKWELL SUPERFICIAL 15-N NOMINAL BODY; Hardness Rating: 15.0 ROCKWELL SUPERFICIAL 15-N NOMINAL FACE. 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.