The Gear,internal, cataloged under National Stock Number 3020-01-045-9204, 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 Army, United States Department of the Dba Rock Island Arsenal Jmtc. Government technical data includes 29 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-045-9204 |
| Primary Part Number | 8447497 |
| Item Name | Gear,internal |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Army, United States Department of the Dba Rock Island Arsenal Jmtc |
| Status | ACTIVE |
| Nominal Width Across Flats | 4.250 INCHES BETWEEN BODY AND FLANGE IN |
| Bore Nominal Diameter | 1.714 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 2.140 INCHES FIRST END IN |
| Backlash Designation | GRADE A |
| Teeth Quantity | 90 |
| Surface Treatment Document and Classification | MIL-STD-171 FN5.3.2.2 MIL STD SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Bore Style | INVOLUTE SPLINE BOTH ENDS |
| Mounting Hole Type and Quantity | 2 THREADED AXIALLY THROUGH FLANGE |
| Nominal Distance Between Body Face and Protruding Hub End | 0.645 INCHES FIRST END IN |
| Precision Classification | QUALITY NUMBER 8 |
| Teeth Type | SPUR |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Overall Length | 2.530 INCHES IN |
| Style Designator | SOLID BACK RING, PROTRUDING HUB, RECESSED HUB |
| Material Document and Classification | ASTM A332 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A331 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.4545 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Spline Quantity | 39 BOTH ENDS |
| Mounting Hole Nominal Thread Size | 0.458 INCHES AXIALLY THROUGH FLANGE IN |
| Nominal Outside Diameter | 6.090 INCHES IN |
| Surface Treatment | PHOSPHATE ZINC OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 4140 OR STEEL COMP 8640 OVERALL |
| Mounting Hole Thread Series Designator | UNF AXIALLY THROUGH FLANGE |
| Spline Pitch Diameter | 1.6250 INCHES NOMINAL BOTH ENDS IN |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 1.580 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 |
|---|---|
| 8447497 PRIMARY | Army, United States Department of the Dba Rock Island Arsenal Jmtc (USA) |
NSN 3020-01-045-9204 is a Gear,internal, manufactured by Army, United States Department of the Dba Rock Island Arsenal Jmtc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-045-9204 has 1 manufacturer part number on file: 8447497 (Army, United States Department of the Dba Rock Island Arsenal Jmtc).
Key specifications for 8447497: Nominal Width Across Flats: 4.250 INCHES BETWEEN BODY AND FLANGE IN; Bore Nominal Diameter: 1.714 INCHES BOTH ENDS IN; Hub Nominal Diameter: 2.140 INCHES FIRST END IN; Backlash Designation: GRADE A. 29 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.