The Tube,middle, cataloged under National Stock Number 4540-01-220-2161, is classified within Federal Supply Class 4540 (Waste Disposal Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4540-01-220-2161 |
| Primary Part Number | 77656-31X8 PIECE 10L1 |
| Item Name | Tube,middle |
| FSC / FSG | 4540 / 45 — Waste Disposal Equipment |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 77656-31X8 PIECE 10L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| SSN637-505-2143926 PIECE 10L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| SSN637-505-2143926 PIECE 10 | 5/1 Secondary reference U.S. Government activity |
| 77656-31X8 PIECE 10 | 3/1 Design control — primary reference U.S. Government activity |
NSN 4540-01-220-2161 is a Tube,middle, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4540, Waste Disposal Equipment. Status: active.
NSN 4540-01-220-2161 has 2 manufacturer part numbers on file: 77656-31X8 PIECE 10L1 (Naval Inventory Control Point Mechanicsburg), SSN637-505-2143926 PIECE 10L1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 77656-31X8 PIECE 10L1: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: QUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS. 2 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 4540-01-220-2161 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.