The Thread Piece,union, cataloged under National Stock Number 4730-00-850-6563, 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 Krobach Mfg. Corp. Dba Krobach Manufacturing Corp. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 8 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-00-850-6563 |
| Primary Part Number | A316873-3 |
| Item Name | Thread Piece,union |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Krobach Mfg. Corp. Dba Krobach Manufacturing Corp |
| Status | ACTIVE |
| Union End Thread Direction | RIGHT-HAND |
| Nominal Pipe Size Designation | 0.500 INCHES IN |
| End Connection Type | WELDED |
| Union End Thread Size | 1-3/4IN-12 IN |
| Seat Type | STRAIGHT FACE |
| Union End Screw Thread Series Designator | UN |
| Material | STEEL COMP 1018 |
| 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 |
|---|---|
| A316873-3 | Krobach Mfg. Corp. Dba Krobach Manufacturing Corp (USA) |
| A316873-3 | Nassau Tool Works, Inc (USA) |
| A316873-3 | Bec Systems Llc Dba Bec Machine Products (USA) |
| A316873-3 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| A316873-3 | Duhadaway Tool & Die Shop Inc (USA) |
| A316873-3 | Ammcon Corp. (USA) |
| A316873-3 | Pre-Mach Inc (USA) |
| A316873-3 | Hamill Manufacturing Company Dba Hamill Manufacturing Co (USA) |
| Reference | Meaning |
|---|---|
| A316873-3 | 5/9 Secondary reference Computa-Base-Machining, Inc. |
| A316873-3 | 5/9 Secondary reference Nuflo, Inc. |
| A316873-3 | 5/9 Secondary reference Calabrese & Sons, Inc. |
| A316873-3 | 3/2 Design control — primary reference U.S. Government activity |
| A316873-3 | 5/9 Secondary reference Master Research & Manufacturing, Inc. Dba Master Research & Manufacturing Inc |
NSN 4730-00-850-6563 is a Thread Piece,union, manufactured by Krobach Mfg. Corp. Dba Krobach Manufacturing Corp, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-00-850-6563 has 8 manufacturer part numbers on file: A316873-3 (Krobach Mfg. Corp. Dba Krobach Manufacturing Corp), A316873-3 (Nassau Tool Works, Inc), A316873-3 (Bec Systems Llc Dba Bec Machine Products), A316873-3 (Sps Technologies, Llc Dba PB Fasteners), A316873-3 (Duhadaway Tool & Die Shop Inc) and 3 more.
Key specifications for A316873-3: Union End Thread Direction: RIGHT-HAND; Nominal Pipe Size Designation: 0.500 INCHES IN; End Connection Type: WELDED; Union End Thread Size: 1-3/4IN-12 IN. 8 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.