The Union,valve Disk Stem, cataloged under National Stock Number 4730-01-236-6021, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Velan Valve Corp.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-236-6021 |
| Primary Part Number | 3556-1-64 |
| Item Name | Union,valve Disk Stem |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Velan Valve Corp. |
| Status | ACTIVE |
| General Characteristics Item Description | STAINLESS STEEL; LOCKWELDS ARE EMPLOYED ON DISK AND DISK UNION AS A MEANS OF SECURING |
| 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 |
|---|---|
| 3556-1-64 PRIMARY | Velan Valve Corp. (USA) |
| 33626-1 ITEM 5 PRIMARY | Velan Valve Corp. (USA) |
| Reference | Meaning |
|---|---|
| 33626-1 | D/9 Drawing number reference only Velan Valve Corp. |
NSN 4730-01-236-6021 is a Union,valve Disk Stem, manufactured by Velan Valve Corp., classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-236-6021 has 2 manufacturer part numbers on file: 3556-1-64 (Velan Valve Corp.), 33626-1 ITEM 5 (Velan Valve Corp.).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-236-6034, 4820-01-236-7333. Verify interchangeability with system specifications before substitution.
Key specifications for 3556-1-64: General Characteristics Item Description: STAINLESS STEEL; LOCKWELDS ARE EMPLOYED ON DISK AND DISK UNION AS A MEANS OF SECURING. 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.