The Thread Piece,union, cataloged under National Stock Number 4730-00-554-9875, 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 Duhadaway Tool & Die Shop Inc. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-00-554-9875 |
| Primary Part Number | A316277-8 |
| Item Name | Thread Piece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Duhadaway Tool & Die Shop Inc |
| Status | ACTIVE |
| Union End Thread Direction | RIGHT-HAND |
| Material Hardness Rating | 92.0 ROCKWELL B MINIMUM AND 98.0 ROCKWELL B MAXIMUM |
| End Connection Type | THREADED |
| Union End Thread Size | 1-1/8IN-12 IN |
| Seat Type | STRAIGHT FACE |
| Thread Direction | RIGHT-HAND |
| Thread Size | 1/2-20 |
| Screw Thread Series Designator | UNF |
| Union End Screw Thread Series Designator | UNF |
| Screw Thread Location | EXTERNAL |
| Material | STEEL COMP 4130 |
| Working Pressure and Service Type | 4000.0 POUNDS PER SQUARE INCH (PSI) NOMINAL WATER LBS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| A316277-8 | Duhadaway Tool & Die Shop Inc (USA) |
| A316277-8 | Krobach Mfg. Corp. Dba Krobach Manufacturing Corp (USA) |
| A316277-8 | Master Research & Manufacturing, Inc. Dba Master Research & Manufacturing Inc (USA) |
| A316277-8 | Nassau Tool Works, Inc (USA) |
| A316277-8 | Airtronics, Llc (USA) |
| A316277-8 | Ammcon Corp. (USA) |
| A316277-8 | Pre-Mach Inc (USA) |
| Reference | Meaning |
|---|---|
| A316277-8 | 5/9 Secondary reference Calabrese & Sons, Inc. |
| EPA21000-260 | 8/1 NATO reproduction reference Naval Group Site De Brest |
| A316277-8 | 3/2 Design control — primary reference U.S. Government activity |
| A316277-8 | 5/9 Secondary reference Nuflo, Inc. |
| A316277-8 | 5/9 Secondary reference Computa-Base-Machining, Inc. |
NSN 4730-00-554-9875 is a Thread Piece,union, manufactured by Duhadaway Tool & Die Shop Inc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-554-9875 has 7 manufacturer part numbers on file: A316277-8 (Duhadaway Tool & Die Shop Inc), A316277-8 (Krobach Mfg. Corp. Dba Krobach Manufacturing Corp), A316277-8 (Master Research & Manufacturing, Inc. Dba Master Research & Manufacturing Inc), A316277-8 (Nassau Tool Works, Inc), A316277-8 (Airtronics, Llc) and 2 more.
1 possible match (shared part number, not a government interchangeability claim): 4730-00-554-9880. Verify interchangeability with system specifications before substitution.
Key specifications for A316277-8: Union End Thread Direction: RIGHT-HAND; Material Hardness Rating: 92.0 ROCKWELL B MINIMUM AND 98.0 ROCKWELL B MAXIMUM; End Connection Type: THREADED; Union End Thread Size: 1-1/8IN-12 IN. 12 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.