The Gear Sector,spur, cataloged under National Stock Number 3020-01-311-1702, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-311-1702 |
| Item Name | Gear Sector,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Status | ACTIVE |
| Bore Nominal Diameter | 2.750 INCHES BOTH ENDS IN |
| Teeth Quantity | 22 |
| Nominal Outside Radius | 4.633 INCHES IN |
| Counterbore Nominal Diameter | 3.002 INCHES SECOND COUNTERBORE FIRST END IN |
| Counterbore Nominal Diameter | 4.250 INCHES FIRST COUNTERBORE FIRST END IN |
| Bore Style | W/STEPPED COUNTERBORE BOTH ENDS |
| Mounting Hole Type and Quantity | 6 THREADED AXIALLY THROUGH BODY FIRST END |
| Style Designator | HUBLESS |
| Mounting Hole Nominal Thread Size | 0.250 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Arc Nominal Length | 11.528 INCHES IN |
| Pitch Radius | 4.5000 INCHES NOMINAL IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Counterbore Nominal Depth | 0.320 INCHES FIRST COUNTERBORE FIRST END IN |
| Counterbore Nominal Depth | 1.750 INCHES SECOND COUNTERBORE FIRST END IN |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) AXIALLY THROUGH BODY FIRST END |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 2.380 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 |
| Reference | Meaning |
|---|---|
| 123-6130328 ITE | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 87542-1723 ITEM 9 | 3/2 Design control — primary reference U.S. Government activity |
| 6130328 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 3020-01-311-1702 is a Gear Sector,spur, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 3020-01-315-4442. Verify interchangeability with system specifications before substitution.
Key specifications for 3020-01-311-1702: Bore Nominal Diameter: 2.750 INCHES BOTH ENDS IN; Teeth Quantity: 22; Nominal Outside Radius: 4.633 INCHES IN; Counterbore Nominal Diameter: 3.002 INCHES SECOND COUNTERBORE FIRST END IN. 18 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.