The Back Up Ring, cataloged under National Stock Number 1560-01-178-7649, is classified within Federal Supply Class 1560 (Airframe Structural Components) of the Aircraft and Airframe Components group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1560-01-178-7649 |
| Item Name | Back Up Ring |
| FSC / FSG | 1560 / 15 — Airframe Structural Components |
| Status | ACTIVE |
| General Characteristics Item Description | 8.2 IN LG,7.2 IN WD,0.063 IN THK; FINISH SRF 2.115; CLAD 7075-T6 SHEET PER QQ-A-287,T6 TEMPER IN |
| Functional Description | USED ON OUTBD MIDSPAR SEAL INSTALLATION |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 69-10909-5 | 5/9 Secondary reference U.S. Government activity |
| 69-10909-5 | 3/2 Design control — primary reference U.S. Government activity |
NSN 1560-01-178-7649 is a Back Up Ring, classified under FSC 1560, Airframe Structural Components. Status: active.
Key specifications for 1560-01-178-7649: General Characteristics Item Description: 8.2 IN LG,7.2 IN WD,0.063 IN THK; FINISH SRF 2.115; CLAD 7075-T6 SHEET PER QQ-A-287,T6 TEMPER IN; Functional Description: USED ON OUTBD MIDSPAR SEAL INSTALLATION; End Item Identification: ACFT MODEL C/KC-135. 2 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 1560-01-178-7649 has DEMIL Code Q. 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.