The Elbow,pipe to Boss, cataloged under National Stock Number 4730-01-184-0977, 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 20 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4730-01-184-0977 |
| Primary Part Number | 2621-021-02ASSY57 |
| 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 | 2 PREFORMED PACKING AND 1 LOCKNUT AND 1 FLAT WASHER AND 1 PLUG |
| Flow Angle | 90.0 DEGREES |
| Nominal Pipe Size Accommodated | 0.500 INCHES FIRST END IN |
| Connection Style | SOCKET W/ GROVE (PIPE) 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 |
| Material Document and Classification | QQ-N-281 FED SPEC SINGLE MATERIAL RESPONSE NUT |
| Material Document and Classification | QQ-C-390 ALYD5 TP 3 FED SPEC SINGLE MATERIAL RESPONSE TAILPIECE |
| Material Document and Classification | QQ-S-763,CLASS 304,COND.A FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Leg Length | 3.030 INCHES NOMINAL FIRST END IN |
| Leg Length | 1.820 INCHES NOMINAL SECOND END IN |
| Nominal Thread Size | 1.313 INCHES SECOND END IN |
| Thread Class | 2A SECOND END A |
| Thread Quantity Per Inch | 12 SECOND END |
| Material | NICKEL ALLOY NUT |
| Material | COPPER ALLOY TAILPIECE |
| Material | STEEL CORROSION RESISTING BODY |
| Thread Series Designator | UN SECOND END |
| 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 |
|---|---|
| 2621-021-02ASSY57 PRIMARY | Custom Hydraulic & Machine, Inc. Dba Custom Hydraulic & Machine Inc (USA) |
| 2621-021-02ASSY57 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 19-97-0437 | 3/2 Design control — primary reference U.S. Government activity |
| 2621-021-02ASSEMBLY57 | 5/2 Secondary reference U.S. Government activity |
| 2621-021-02 | D/9 Drawing number reference only U.S. Government activity |
| 17-97-0437 | 5/9 Secondary reference U.S. Government activity |
NSN 4730-01-184-0977 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 4730-01-184-0977 has 2 manufacturer part numbers on file: 2621-021-02ASSY57 (Custom Hydraulic & Machine, Inc. Dba Custom Hydraulic & Machine Inc), 2621-021-02ASSY57 (Derbyshire Machine & Tool Co).
Key specifications for 2621-021-02ASSY57: Furnished Items and Quantity: 2 PREFORMED PACKING AND 1 LOCKNUT AND 1 FLAT WASHER AND 1 PLUG; Flow Angle: 90.0 DEGREES; Nominal Pipe Size Accommodated: 0.500 INCHES FIRST END IN; Connection Style: SOCKET W/ GROVE (PIPE) FIRST END. 20 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.