The Union,pipe, cataloged under National Stock Number 4730-01-031-0516, 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 The American Society of Mechanical Engineers. Government technical data includes 24 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-031-0516 |
| Primary Part Number | ASMEB16.39-12-T-A |
| Item Name | Union,pipe |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | The American Society of Mechanical Engineers |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-Z-325,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OR ASTM A153,CALSS A ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Connection Style | PLAIN (PIPE) ALL ENDS |
| Nominal Overall Length | 1.610 INCHES IN |
| Connection Type | THREADED INTERNAL PIPE ALL ENDS |
| Style Designator | SCREWED |
| Material Document and Classification | QQ-I-666 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A47 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A197 ASSN STD 1ST MATERIAL RESPONSE OR ANSI G49.1 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A576 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A675 ASSN STD 2ND MATERIAL RESPONSE THREAD PIECE |
| Material Document and Classification | QQ-I-666 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A47 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A197 ASSN STD 1ST MATERIAL RESPONSE OR ANSI G49.1 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A576 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A675 ASSN STD 2ND MATERIAL RESPONSE TAILPIECE |
| Material Document and Classification | QQ-I-666 FED SPEC 1ST MATERIAL RESPONSE OR ASTM A47 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A197 ASSN STD 1ST MATERIAL RESPONSE OR ANSI G49.1 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A576 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A675 ASSN STD 2ND MATERIAL RESPONSE NUT |
| Operating Pressure | 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SECOND RESPONSE LBS |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS |
| Seat Type | GROUND-JOINT |
| Nominal Thread Size | 0.375 INCHES ALL ENDS IN |
| Specification/standard Data | 81348-WW-U-531 GOVERNMENT SPECIFICATION |
| Maximum Operating Temp | 450.0 FAHRENHEIT FIRST RESPONSE DEGF |
| Maximum Operating Temp | 450.0 FAHRENHEIT SECOND RESPONSE DEGF |
| Nondefinitive Spec/std Data | 1 CLASS AND B TYPE |
| Surface Treatment | ZINC OVERALL |
| Media for Which Designed | WATER-OIL-GAS SECOND RESPONSE |
| Media for Which Designed | STEAM FIRST RESPONSE |
| Material | COPPER ALLOY SEAT |
| Material | IRON OR STEEL TAILPIECE |
| Material | IRON OR STEEL NUT |
| Material | IRON OR STEEL THREAD PIECE |
| Thread Series Designator | NPT ALL ENDS |
| 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 |
|---|---|
| ASMEB16.39-12-T-A PRIMARY | The American Society of Mechanical Engineers (USA) |
| Reference | Meaning |
|---|---|
| WWU531-12TA | 5/9 Secondary reference U.S. Government activity |
| ASME-B16.39 | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
NSN 4730-01-031-0516 is a Union,pipe, manufactured by The American Society of Mechanical Engineers, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-031-0516 has 1 manufacturer part number on file: ASMEB16.39-12-T-A (The American Society of Mechanical Engineers).
Key specifications for ASMEB16.39-12-T-A: Surface Treatment Document and Classification: QQ-Z-325,TYPE 2,CLASS 1 FED SPEC SINGLE TREATMENT RESPONSE OR ASTM A153,CALSS A ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Connection Style: PLAIN (PIPE) ALL ENDS; Nominal Overall Length: 1.610 INCHES IN; Connection Type: THREADED INTERNAL PIPE ALL ENDS. 24 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.