The Gear,spur, cataloged under National Stock Number 3020-00-678-4239, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 22 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-678-4239 |
| Primary Part Number | 8682689 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.500 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 3.150 INCHES SECOND END IN |
| Hub Nominal Diameter | 3.230 INCHES FIRST END IN |
| Backlash Designation | GRADE A |
| Teeth Quantity | 57 |
| Body Style | WEBBED, SOLID |
| Counterbore Nominal Diameter | 2.987 INCHES FIRST END IN |
| Bore Style | W/COUNTERBORE BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.780 INCHES FIRST END IN |
| Mounting Hole Nominal Diameter | 2.500 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Hardness Rating | 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 1.530 INCHES IN |
| Style Designator | ONE PROTRUDING HUB, ONE FLUSH HUB |
| Material Document and Classification | MIL-S-13048 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 6.3333 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Nominal Outside Diameter | 6.555 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 1.376 INCHES FIRST END IN |
| Face Nominal Width | 0.750 INCHES 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 |
|---|---|
| 8682689 | Renk America Llc Div Renk America (USA) |
| 8682689 | Satair A/s (DNK) |
| 8682689 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 3020006784239 | 5/9 Secondary reference E.c.a Etablissement Centrald'approvisionnement Des Forces Armee |
NSN 3020-00-678-4239 is a Gear,spur, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-678-4239 has 3 manufacturer part numbers on file: 8682689 (Renk America Llc Div Renk America), 8682689 (Satair A/s), 8682689 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 8682689: Bore Nominal Diameter: 2.500 INCHES BOTH ENDS IN; Hub Nominal Diameter: 3.150 INCHES SECOND END IN; Hub Nominal Diameter: 3.230 INCHES FIRST END IN; Backlash Designation: GRADE A. 22 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.