The Coupling,shaft,flexible, cataloged under National Stock Number 3010-01-178-3260, is classified within Federal Supply Class 3010 (Torque Converters and Speed Changers) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Acs Defense, Llc. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3010-01-178-3260 |
| Primary Part Number | 20457-1 |
| Item Name | Coupling,shaft,flexible |
| FSC / FSG | 3010 / 30 — Torque Converters and Speed Changers |
| Manufacturer | Acs Defense, Llc |
| Status | ACTIVE |
| Securing Method | THREADED HOLE(S) BOTH ENDS |
| Threaded Hole Location | BOTH ENDS: SIX HOLES SPACED 0.188 FROM END OF HUB 60 DEG APART |
| Design Type | INTERNAL GEAR |
| Outside Diameter | 4.562 INCHES NOMINAL IN |
| Features Provided | GEAR FLEX |
| Threaded Hole Quantity | 6 BOTH ENDS |
| Thread Size Designator | 3/8 24 BOTH ENDS |
| 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 |
|---|---|
| 20457-1 PRIMARY | Acs Defense, Llc (USA) |
| Reference | Meaning |
|---|---|
| TYPE G52 1.000IN | 5/1 Secondary reference Rexnord Industries Llc |
NSN 3010-01-178-3260 is a Coupling,shaft,flexible, manufactured by Acs Defense, Llc, classified under FSC 3010, Torque Converters and Speed Changers. Status: active.
NSN 3010-01-178-3260 has 1 manufacturer part number on file: 20457-1 (Acs Defense, Llc).
2 possible matches (shared part number, not a government interchangeability claim): 3120-01-288-9460, 4720-01-631-6767. Verify interchangeability with system specifications before substitution.
Key specifications for 20457-1: Securing Method: THREADED HOLE(S) BOTH ENDS; Threaded Hole Location: BOTH ENDS: SIX HOLES SPACED 0.188 FROM END OF HUB 60 DEG APART; Design Type: INTERNAL GEAR; Overall Length: 3.453 INCHES NOMINAL IN. 7 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.