The Gear,internal, cataloged under National Stock Number 3020-01-028-0888, 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 21 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 | 3020-01-028-0888 |
| Primary Part Number | 12000550 |
| 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 |
| Bore Nominal Diameter | 5.493 INCHES FIRST END IN |
| Hub Nominal Diameter | 6.068 INCHES FIRST END IN |
| Backlash Designation | GRADE A |
| Teeth Quantity | 84 |
| Surface Treatment Document and Classification | MIL-STD-171 FN5.3.2.2 MIL STD SINGLE TREATMENT RESPONSE OVERALL |
| Body Style | PLAIN, SOLID |
| Counterbore Nominal Diameter | 5.865 INCHES FIRST END IN |
| Bore Style | W/COUNTERBORE FIRST END |
| Precision Classification | QUALITY NUMBER 8 |
| Teeth Type | STRAIGHT |
| Nominal Overall Length | 2.210 INCHES IN |
| Style Designator | PLAIN RING |
| Material Document and Classification | ASTM A332 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A331 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 5.6000 INCHES NOMINAL IN |
| Features Provided | FILLED MARKINGS |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 6.196 INCHES IN |
| Pressure Angle | 30.0000 DEGREES |
| Material | STEEL COMP 4140 OR STEEL COMP 8640 OVERALL |
| Counterbore Nominal Depth | 0.050 INCHES FIRST END IN |
| Attachment Method | PRESS FIT |
| 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 |
|---|---|
| 12000550 PRIMARY | Army, United States Department of the Dba Rock Island Arsenal Jmtc (USA) |
NSN 3020-01-028-0888 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 3020-01-028-0888 has 1 manufacturer part number on file: 12000550 (Army, United States Department of the Dba Rock Island Arsenal Jmtc).
Key specifications for 12000550: Bore Nominal Diameter: 5.493 INCHES FIRST END IN; Hub Nominal Diameter: 6.068 INCHES FIRST END IN; Backlash Designation: GRADE A; Teeth Quantity: 84. 21 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.