The Hub,spider Drive, cataloged under National Stock Number 2530-01-122-6239, is classified within Federal Supply Class 2530 (Vehicular Brake, Steering, Axle, Wheel, and Track Components) of the Vehicular Equipment Components group. The manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. Government technical data includes 1 specification, 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2530-01-122-6239 |
| Primary Part Number | A5939L |
| Item Name | Hub,spider Drive |
| FSC / FSG | 2530 / 25 — Vehicular Brake, Steering, Axle, Wheel, and Track Components |
| Manufacturer | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL,M3124 SEMI-FINISHED,PER S396-1;FINISH ALL OVER;NO HEAT TREATMENT;O/A DIA 6.000 IN. NOMINAL;O/A H 4.750 IN. NOMINAL;BORE DIA 1.249 IN. MIN AND 1.250 IN. MAX;TWO (2) FACE DIAARE 4.125 IN. NOMINAL AND 4.375 IN. NOMINAL;BORE KEYWAY 0.3125 IN. MIN AND0.3145 IN. MAX WIDTH BY 0.1637 IN. NOMINAL HEIGHT;DISTANCE FROM KEYWAY BOTTOM TO BORE DIA OPPOSITE 1.391 IN. MIN AND 1.396 IN. MAX;8 REAM THRU HOLES,EQUALLY SPACED,0.374 IN. MIN AND0.375 IN. MAX DIA,ON 2.625 IN. RADIUS;ONE (1) HOLE,0.656 IN. DIA DRILLED,0.75-10 NC TAPPED,OPPOSITE KEYWAY AND 1.00 IN. FROM FACE W/ 4.375 IN. DIA; ONE (1) HOLE,0.125-27 NPT TAPPED TO DEPTH 0.750 IN.,W/ 0.339 IN. DIA TAP- DRILLED THRU TO BORE,OPPOSITE KEYWAY ON 6.000 IN. RADIUS IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| A5939L PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
NSN 2530-01-122-6239 is a Hub,spider Drive, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 2530, Vehicular Brake, Steering, Axle, Wheel, and Track Components. Status: active.
NSN 2530-01-122-6239 has 1 manufacturer part number on file: A5939L (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).
Key specifications for A5939L: General Characteristics Item Description: STEEL,M3124 SEMI-FINISHED,PER S396-1;FINISH ALL OVER;NO HEAT TREATMENT;O/A DIA 6.000 IN. NOMINAL;O/A H 4.750 IN. NOMINAL;BORE DIA 1.249 IN. MIN AND 1.250 IN. MAX;TWO (2) FACE DIAARE 4.125 IN. NOMINAL AND 4.375 IN. NOMINAL;BORE KEYWAY 0.3125 IN. MIN AND0.3145 IN. MAX WIDTH BY 0.1637 IN. NOMINAL HEIGHT;DISTANCE FROM KEYWAY BOTTOM TO BORE DIA OPPOSITE 1.391 IN. MIN AND 1.396 IN. MAX;8 REAM THRU HOLES,EQUALLY SPACED,0.374 IN. MIN AND0.375 IN. MAX DIA,ON 2.625 IN. RADIUS;ONE (1) HOLE,0.656 IN. DIA DRILLED,0.75-10 NC TAPPED,OPPOSITE KEYWAY AND 1.00 IN. FROM FACE W/ 4.375 IN. DIA; ONE (1) HOLE,0.125-27 NPT TAPPED TO DEPTH 0.750 IN.,W/ 0.339 IN. DIA TAP- DRILLED THRU TO BORE,OPPOSITE KEYWAY ON 6.000 IN. RADIUS IN. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 2530-01-122-6239 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.