The Frame,observation Window, cataloged under National Stock Number 5520-01-048-5175, is classified within Federal Supply Class 5520 (Millwork) of the Lumber, Millwork, Plywood, and Veneer group. The manufacturer of record is L3harris Technologies, Inc Div Space & Airborne Systems. Government technical data includes 1 specification, 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5520-01-048-5175 |
| Primary Part Number | 73217 |
| Item Name | Frame,observation Window |
| FSC / FSG | 5520 / 55 — Millwork |
| Manufacturer | L3harris Technologies, Inc Div Space & Airborne Systems |
| Status | ACTIVE |
| General Characteristics Item Description | ALUMINUM QQ-A-355 ALLOY 2024 T4,5.000 IN. LG,4.000 IN. W,0.250 IN. O/A THK,APERATURE DIA 3.000 IN.,COUNTERBORED WINDOW RECESS DIA 3.406 IN.,4MTG HOLES 0.189 IN. DIA LOCATED EA CORNER,4 WINDOW RETAINING 0.112-40 2B UNC HOLES EQUALLY SPACED ON 3.625 IN. BOLT CIRCLE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5520-01-048-5175 is a Frame,observation Window, manufactured by L3harris Technologies, Inc Div Space & Airborne Systems, classified under FSC 5520, Millwork. Status: active.
NSN 5520-01-048-5175 has 2 manufacturer part numbers on file: 73217 (L3harris Technologies, Inc Div Space & Airborne Systems), GIB73217 (L3harris Technologies, Inc Div Space & Airborne Systems).
Key specifications for 73217: General Characteristics Item Description: ALUMINUM QQ-A-355 ALLOY 2024 T4,5.000 IN. LG,4.000 IN. W,0.250 IN. O/A THK,APERATURE DIA 3.000 IN.,COUNTERBORED WINDOW RECESS DIA 3.406 IN.,4MTG HOLES 0.189 IN. DIA LOCATED EA CORNER,4 WINDOW RETAINING 0.112-40 2B UNC HOLES EQUALLY SPACED ON 3.625 IN. BOLT CIRCLE IN. 1 specification is 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.