The Tubing Assembly,nonmetallic, cataloged under National Stock Number 4720-00-689-6844, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Transdigm Inc. Government technical data includes 18 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. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4720-00-689-6844 |
| Primary Part Number | 21501-1 |
| Item Name | Tubing Assembly,nonmetallic |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Manufacturer | Transdigm Inc |
| Status | ACTIVE |
| Measuring Method and Length | 33.560 INCHES MINIMUM WORKING AND 34.060 INCHES MAXIMUM WORKING IN |
| Connection Style | SWIVEL NUT FLARE FIRST END |
| End Connection Design | STRAIGHT FIRST END |
| End Connection Design | STRAIGHT SECOND END |
| Connection Type | UNTHREADED EXTERNAL TUBE SECOND END |
| Connection Type | THREADED INTERNAL TUBE FIRST END |
| Nominal Outside Diameter Tube Accommodated | 0.250 INCHES SECOND END IN |
| Cross-Sectional Shape Style | ROUND |
| Outside Diameter | 0.250 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.438 INCHES FIRST END IN |
| Seat Angle | 37.0 DEGREES FIRST END |
| Exterior Color | NATURAL |
| Inside Diameter | 0.438 INCHES NOMINAL IN |
| Inside Surface Condition | SMOOTH |
| Thread Class | 3B FIRST END |
| Material | PLASTIC TUBE |
| Thread Series Designator | UNF FIRST END |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 21501-1 PRIMARY | Transdigm Inc (USA) |
NSN 4720-00-689-6844 is a Tubing Assembly,nonmetallic, manufactured by Transdigm Inc, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
NSN 4720-00-689-6844 has 1 manufacturer part number on file: 21501-1 (Transdigm Inc).
3 possible matches (shared part number, not a government interchangeability claim): 2990-00-846-2792, 5310-01-123-8061, 5950-01-129-0032. Verify interchangeability with system specifications before substitution.
Key specifications for 21501-1: Measuring Method and Length: 33.560 INCHES MINIMUM WORKING AND 34.060 INCHES MAXIMUM WORKING IN; Connection Style: SWIVEL NUT FLARE FIRST END; End Connection Design: STRAIGHT FIRST END; End Connection Design: STRAIGHT SECOND END. 18 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 4720-00-689-6844 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.