The Coupling,air Conditioning-Heatin, cataloged under National Stock Number 4520-01-525-4015, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-525-4015 |
| Primary Part Number | 5271K73 |
| Item Name | Coupling,air Conditioning-Heatin |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Overall Diameter | 6.000 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 5271K73 PRIMARY | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 5271K73 | 5/9 Secondary reference Advanced Acoustic Concepts, Llc Div Mdo-Dco |
NSN 4520-01-525-4015 is a Coupling,air Conditioning-Heatin, manufactured by Mcmaster-Carr Supply Co, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-525-4015 has 1 manufacturer part number on file: 5271K73 (Mcmaster-Carr Supply Co).
Key specifications for 5271K73: Overall Diameter: 6.000 INCHES NOMINAL IN; Overall Width: 2.875 INCHES NOMINAL IN; Special Features: TWO PIECE COUPLER USING J-SLOTS AND MATING PINS TO JOIN AND LOCK; USED WITH STANDARD BANDING OR SCREW CLAMPS NOT INCLUDED.; End Item Identification: BINAURAL HEAD. 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.
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.