The Elbow,pipe to Boss, cataloged under National Stock Number 4730-01-173-8347, 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 Custom Hydraulic & Machine, Inc. Dba Custom Hydraulic & Machine Inc. Government technical data includes 30 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-173-8347 |
| Primary Part Number | 2621-021-02ASSY45 |
| Item Name | Elbow,pipe to Boss |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Custom Hydraulic & Machine, Inc. Dba Custom Hydraulic & Machine Inc |
| Status | ACTIVE |
| Furnished Items and Quantity | 1 BULKHEAD NUT AND 1 PREFORMED PACKING AND 1 FLAT WASHER |
| Flow Angle | 90.0 DEGREES |
| Nominal Pipe Size Accommodated | 0.750 INCHES FIRST END IN |
| Connection Style | SOCKET (TUBE) FIRST END |
| Connection Style | DOUBLE THREADED SECTION W/ GASKET AND LOCKNUT SEALING (BOSS) SECOND END |
| Union Joint Location | FIRST END |
| Connection Type | UNTHREADED INTERNAL PIPE FIRST END |
| Connection Type | THREADED EXTERNAL BOSS SECOND END |
| Connection Type | THREADED EXTERNAL BOSS SECOND END BULKHEAD |
| Material Document and Classification | QQ-N-281 FED SPEC 1ST MATERIAL RESPONSE NUT |
| Material Document and Classification | QQ-N-281 FED SPEC 1ST MATERIAL RESPONSE NUTUNABLE TO DECODE |
| Material Document and Classification | QQ-S-763,CL302,COND A FED SPEC 1ST MATERIAL RESPONSE THREAD PIECE |
| Material Document and Classification | QQ-S-763,CL302,COND A FED SPEC 1ST MATERIAL RESPONSE THREAD PIECEUNABLE TO DECODE |
| Material Document and Classification | QQ-S-763,CL304,COND A FED SPEC 1ST MATERIAL RESPONSE TAILPIECE |
| Material Document and Classification | QQ-S-763,CL304,COND A FED SPEC 1ST MATERIAL RESPONSE TAILPIECEUNABLE TO DECODE |
| Operating Pressure | 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Leg Length | 2.750 INCHES MINIMUM AND 2.875 INCHES MAXIMUM SECOND END IN |
| Leg Length | 3.245 INCHES MINIMUM AND 3.430 INCHES MAXIMUM FIRST END IN |
| Nominal Thread Size | 1.312 INCHES SECOND END BULKHEAD IN |
| Nominal Thread Size | 1.312 INCHES SECOND END IN |
| Pipe Wall Thickness Designation for Which Designed | SCHEDULE XS FIRST END |
| Surface Treatment | PASSIVATE BODY |
| Surface Treatment | PASSIVATE BODYUNABLE TO DECODE |
| Surface Treatment | PASSIVATE THREAD PIECE |
| Surface Treatment | PASSIVATE THREAD PIECEUNABLE TO DECODE |
| Media for Which Designed | FLUID SINGLE RESPONSE |
| Media for Which Designed | FLUID SINGLE RESPONSEUNABLE TO DECODE |
| Thread Class | 2A SECOND END BULKHEAD A |
| Thread Class | 2A SECOND END A |
| Thread Quantity Per Inch | 12 SECOND END BULKHEAD |
| 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 |
|---|---|
| 2621-021-02ASSY45 PRIMARY | Custom Hydraulic & Machine, Inc. Dba Custom Hydraulic & Machine Inc (USA) |
| Reference | Meaning |
|---|---|
| 516-4682243F7 | 5/2 Secondary reference U.S. Government activity |
| 2621-021-02 | D/9 Drawing number reference only U.S. Government activity |
| 2621-021-02 ASSY45 | 3/2 Design control — primary reference U.S. Government activity |
| 516-4682243 | D/9 Drawing number reference only U.S. Government activity |
| 2621-021-02ASSY45 | 5/9 Secondary reference Mindeco Corp |
NSN 4730-01-173-8347 is a Elbow,pipe to Boss, manufactured by Custom Hydraulic & Machine, Inc. Dba Custom Hydraulic & Machine Inc, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-173-8347 has 1 manufacturer part number on file: 2621-021-02ASSY45 (Custom Hydraulic & Machine, Inc. Dba Custom Hydraulic & Machine Inc).
Key specifications for 2621-021-02ASSY45: Furnished Items and Quantity: 1 BULKHEAD NUT AND 1 PREFORMED PACKING AND 1 FLAT WASHER; Flow Angle: 90.0 DEGREES; Nominal Pipe Size Accommodated: 0.750 INCHES FIRST END IN; Connection Style: SOCKET (TUBE) FIRST END. 30 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.