The Trap,steam, cataloged under National Stock Number 4730-01-429-3413, 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 Armstrong International Inc Dba Armstrong Machine Works. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-429-3413 |
| Primary Part Number | 312-3/16ORIFICE-3/4SW |
| Item Name | Trap,steam |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Armstrong International Inc Dba Armstrong Machine Works |
| Status | ACTIVE |
| Design Type | BUCKET |
| Inlet Connection Type | SOCKET WELDING |
| Maximum Steam Working Pressure | ERR-060 |
| Body Design | STRAIGHT PATTERN |
| Material | STEEL CORROSION RESISTING BODY |
| Outlet Connection Type | SOCKET WELDING |
| 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 |
|---|---|
| 1139-12-C-IT24 | Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil (USA) |
| 312-3/16ORIFICE-3/4SW PRIMARY | Armstrong International Inc Dba Armstrong Machine Works (USA) |
| 1139-00-B2 IT24 | Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil (USA) |
| Reference | Meaning |
|---|---|
| 312-3/16ORFICE- | C/1 Advisory reference — outside the item-of-supply concept Armstrong International Inc Dba Armstrong Machine Works |
| 1139-00-B2 | D/9 Drawing number reference only Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil |
NSN 4730-01-429-3413 is a Trap,steam, manufactured by Armstrong International Inc Dba Armstrong Machine Works, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-429-3413 has 3 manufacturer part numbers on file: 1139-12-C-IT24 (Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil), 312-3/16ORIFICE-3/4SW (Armstrong International Inc Dba Armstrong Machine Works), 1139-00-B2 IT24 (Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-430-2745. Verify interchangeability with system specifications before substitution.
Key specifications for 312-3/16ORIFICE-3/4SW: Design Type: BUCKET; Inlet Connection Type: SOCKET WELDING; Maximum Steam Working Pressure: ERR-060; Body Design: STRAIGHT PATTERN. 6 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.