The Tubing,nonmetallic, cataloged under National Stock Number 4720-01-447-3100, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Hardigg Industries, Llc Div Hardigg Cases. Government technical data includes 9 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4720-01-447-3100 |
| Primary Part Number | P21-963-1 |
| Item Name | Tubing,nonmetallic |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Manufacturer | Hardigg Industries, Llc Div Hardigg Cases |
| Status | ACTIVE |
| Measuring Method and Length | 24.000 INCHES NOMINAL OVERALL IN |
| Flexibility | FLEXIBLE |
| Cross-Sectional Shape Style | ROUND |
| Outside Diameter | 0.328 INCHES NOMINAL IN |
| Exterior Color | CLEAR |
| Specification/standard Data | MIL-I-631 GOVERNMENT SPECIFICATION |
| Nondefinitive Spec/std Data | F TYPE AND U FORM AND A GRADE AND 2 CLASS AND 1 CATEGORY |
| Inside Diameter | 0.294 INCHES NOMINAL IN |
| Material | PLASTIC POLYVINYL CHLORIDE (PVC) TUBE |
| 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 |
|---|---|
| P21-963-1 PRIMARY | Hardigg Industries, Llc Div Hardigg Cases (USA) |
| Reference | Meaning |
|---|---|
| P21-963 | D/9 Drawing number reference only Hardigg Industries, Llc Div Hardigg Cases |
| MIL-I-631 | 4/1 Identification reference U.S. Government activity |
NSN 4720-01-447-3100 is a Tubing,nonmetallic, manufactured by Hardigg Industries, Llc Div Hardigg Cases, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
NSN 4720-01-447-3100 has 1 manufacturer part number on file: P21-963-1 (Hardigg Industries, Llc Div Hardigg Cases).
1 possible match (shared part number, not a government interchangeability claim): 4720-01-447-3102. Verify interchangeability with system specifications before substitution.
Key specifications for P21-963-1: Measuring Method and Length: 24.000 INCHES NOMINAL OVERALL IN; Flexibility: FLEXIBLE; Cross-Sectional Shape Style: ROUND; Outside Diameter: 0.328 INCHES NOMINAL IN. 9 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.