The Elbow,flange to Tube, cataloged under National Stock Number 4730-01-138-6176, 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 Guill Tool & Engineering Co Inc Div Guill Defense. Government technical data includes 25 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4730-01-138-6176 |
| Primary Part Number | 2621-166-03ASSY112 |
| Item Name | Elbow,flange to Tube |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | Guill Tool & Engineering Co Inc Div Guill Defense |
| Status | ACTIVE |
| Flange Shape | RECTANGULAR WITH HOLES SECOND END |
| Furnished Items and Quantity | 4 FLAT WASHER |
| Flow Angle | 90.0 DEGREES |
| Flange Face Design | PLAIN SECOND END |
| Connection Style | SOCKET (TUBE) FIRST END |
| Nominal Length | 3.500 INCHES SECOND END IN |
| Tubing Wall Nominal Thickness for Which Designed | 0.145 INCHES FIRST END IN |
| Connection Type | FLANGE SECOND END |
| Connection Type | UNTHREADED INTERNAL TUBE FIRST END |
| Material Document and Classification | QQ-A-225/8,T6 FED SPEC SINGLE MATERIAL RESPONSE SLEEVE |
| Material Document and Classification | QQ-S-763,CL 304,COND A FED SPEC SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | QQ-S-763,CL 304,COND A FED SPEC SINGLE MATERIAL RESPONSE BODYUNABLE TO DECODE |
| Bolt Hole Nominal Diameter | 0.531 INCHES SECOND END IN |
| Nominal Outside Diameter Tube Accommodated | 1.910 INCHES FIRST END IN |
| Operating Pressure | 700.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Leg Length | 1.500 INCHES NOMINAL SECOND END IN |
| Leg Length | 2.630 INCHES NOMINAL FIRST END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Width | 2.500 INCHES SECOND END IN |
| Bolt Hole Quantity | 4 SECOND END |
| Nominal Width | 3.500 INCHES SECOND END IN |
| Center to Center Nominal Distance Between Bolt Holes Along Length | 2.500 INCHES SECOND END IN |
| Material | STEEL CORROSION RESISTING BODY |
| Material | ALUMINUM ALLOY SLEEVE |
| Material | ALUMINUM ALLOY SLEEVEUNABLE TO DECODE |
| Nominal Thickness | 3.000 INCHES SECOND END IN |
| 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 |
|---|---|
| 2621-166-03ASSY112 | Guill Tool & Engineering Co Inc Div Guill Defense (USA) |
| 2621-166-03ASSY112 | Custom Hydraulic & Machine, Inc. Dba Custom Hydraulic & Machine Inc (USA) |
| 2621-166-03ASSY112 | Maine Machine Products Company (USA) |
| Reference | Meaning |
|---|---|
| 845-4687601 | D/9 Drawing number reference only U.S. Government activity |
| 2621-166-03ASSY112 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4730-01-138-6176 is a Elbow,flange to Tube, manufactured by Guill Tool & Engineering Co Inc Div Guill Defense, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-138-6176 has 3 manufacturer part numbers on file: 2621-166-03ASSY112 (Guill Tool & Engineering Co Inc Div Guill Defense), 2621-166-03ASSY112 (Custom Hydraulic & Machine, Inc. Dba Custom Hydraulic & Machine Inc), 2621-166-03ASSY112 (Maine Machine Products Company).
Key specifications for 2621-166-03ASSY112: Flange Shape: RECTANGULAR WITH HOLES SECOND END; Furnished Items and Quantity: 4 FLAT WASHER; Flow Angle: 90.0 DEGREES; Flange Face Design: PLAIN SECOND END. 25 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.