The Coupling,shaft,rigid, cataloged under National Stock Number 3010-01-237-8388, is classified within Federal Supply Class 3010 (Torque Converters and Speed Changers) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Johnston Pump Co Inc Div of Johnston Pump/general Valve Inc. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3010-01-237-8388 |
| Primary Part Number | 21777-A |
| Item Name | Coupling,shaft,rigid |
| FSC / FSG | 3010 / 30 — Torque Converters and Speed Changers |
| Manufacturer | Johnston Pump Co Inc Div of Johnston Pump/general Valve Inc |
| Status | ACTIVE |
| Bore Shape | STRAIGHT 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 |
|---|---|
| H-3288 PIECE 22 | Johnston Pump Co Inc Div of Johnston Pump/general Valve Inc (USA) |
| 21777-A PRIMARY | Johnston Pump Co Inc Div of Johnston Pump/general Valve Inc (USA) |
| Reference | Meaning |
|---|---|
| H-3288 D | D/9 Drawing number reference only Johnston Pump Co Inc Div of Johnston Pump/general Valve Inc |
NSN 3010-01-237-8388 is a Coupling,shaft,rigid, manufactured by Johnston Pump Co Inc Div of Johnston Pump/general Valve Inc, classified under FSC 3010, Torque Converters and Speed Changers. Status: active.
NSN 3010-01-237-8388 has 2 manufacturer part numbers on file: H-3288 PIECE 22 (Johnston Pump Co Inc Div of Johnston Pump/general Valve Inc), 21777-A (Johnston Pump Co Inc Div of Johnston Pump/general Valve Inc).
1 possible match (shared part number, not a government interchangeability claim): 3010-01-237-8389. Verify interchangeability with system specifications before substitution.
Key specifications for 21777-A: Bore Shape: STRAIGHT BOTH ENDS. 1 specification is 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.