The Coupling,shaft,flexible, cataloged under National Stock Number 3010-00-977-2783, is classified within Federal Supply Class 3010 (Torque Converters and Speed Changers) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Curtiss-Wright Electro-Mechanical Corporation Div Epd. Government technical data includes 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3010-00-977-2783 |
| Primary Part Number | 212556 |
| Item Name | Coupling,shaft,flexible |
| FSC / FSG | 3010 / 30 — Torque Converters and Speed Changers |
| Manufacturer | Curtiss-Wright Electro-Mechanical Corporation Div Epd |
| Status | ACTIVE |
| Keyway Depth | 0.2500 INCHES NOMINAL SECOND END IN |
| Keyway Depth | 0.2357 INCHES NOMINAL FIRST END IN |
| FSC Application Data | PUMP,CENTRIFUGAL |
| Bore Length | 1.9380 INCHES NOMINAL FIRST END IN |
| Bore Length | 2.4380 INCHES NOMINAL SECOND END IN |
| Design Type | INTERNAL GEAR |
| Taper Minor Diameter | 1.6270 INCHES NOMINAL SECOND END IN |
| Taper Minor Diameter | 1.8750 INCHES MINIMUM AND 1.8755 INCHES MAXIMUM FIRST END IN |
| Keying Facility Type | KEYWAY FIRST END |
| Keying Facility Type | KEYWAY SECOND END |
| Outside Diameter | 7.188 INCHES NOMINAL IN |
| Features Provided | KEYWAY AND EXPOSED COUPLING BOLT TYPE AND MILL MOTOR |
| Bore Shape | TAPERED BOTH ENDS |
| Keying Facility Quantity | 1 SECOND END |
| Keying Facility Quantity | 1 FIRST END |
| Taper Largest Diameter | 1.7490 INCHES NOMINAL SECOND END IN |
| Taper Largest Diameter | 1.9961 INCHES MINIMUM AND 1.9966 INCHES MAXIMUM FIRST END IN |
| Keyway Width | 0.500 INCHES NOMINAL SECOND END IN |
| Keyway Width | 0.619 INCHES MINIMUM AND 0.621 INCHES MAXIMUM FIRST 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 |
|---|---|
| 212556 PRIMARY | Curtiss-Wright Electro-Mechanical Corporation Div Epd (USA) |
| 212556 | Toolex, Inc Dba Toolex Inc (USA) |
| Reference | Meaning |
|---|---|
| CC28086 | C/1 Advisory reference — outside the item-of-supply concept Emerson Power Transmission Corporation Dba Emerson Div Emerson Power Transmission Division |
| CC28086 | 5/9 Secondary reference Environmental Elements Corp |
NSN 3010-00-977-2783 is a Coupling,shaft,flexible, manufactured by Curtiss-Wright Electro-Mechanical Corporation Div Epd, classified under FSC 3010, Torque Converters and Speed Changers. Status: active.
NSN 3010-00-977-2783 has 2 manufacturer part numbers on file: 212556 (Curtiss-Wright Electro-Mechanical Corporation Div Epd), 212556 (Toolex, Inc Dba Toolex Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5820-01-039-6512, 3010-01-408-1602, 3010-01-408-8165. Verify interchangeability with system specifications before substitution.
Key specifications for 212556: Keyway Depth: 0.2500 INCHES NOMINAL SECOND END IN; Keyway Depth: 0.2357 INCHES NOMINAL FIRST END IN; FSC Application Data: PUMP,CENTRIFUGAL; Bore Length: 1.9380 INCHES NOMINAL FIRST END IN. 19 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.