The Gear Sector,spur, cataloged under National Stock Number 3020-01-273-7687, 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 Rolls-Royce Plc Naval Marine. Government technical data includes 13 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-273-7687 |
| Primary Part Number | 27756-C |
| Item Name | Gear Sector,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Rolls-Royce Plc Naval Marine |
| Status | ACTIVE |
| Teeth Quantity | 160 |
| Nominal Outside Radius | 2.512 INCHES IN |
| Mounting Hole Type and Quantity | 2 COUNTERBORED AXIALLY THROUGH BODY FIRST END |
| Mounting Hole Nominal Diameter | 0.128 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Tooth Form | STANDARD |
| Arc Nominal Length | 7.854 INCHES IN |
| Pitch Radius | 2.4960 INCHES NOMINAL IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Bolt Hole Circle Nominal Diameter | 1.625 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| Body Recess Nominal Depth | 1.468 INCHES FIRST END IN |
| Face Nominal Width | 0.219 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 |
|---|---|
| 27756-C | Rolls-Royce Plc Naval Marine (GBR) |
| Reference | Meaning |
|---|---|
| 27756-C | 5/9 Secondary reference Rolls-Royce Power Engineering Plc. |
| 27756-C | 3/9 Design control — primary reference Negron Marine Consultants Inc |
| 4-01087-000 | 5/9 Secondary reference U.S. Government activity |
| 4-01087-000 | C/1 Advisory reference — outside the item-of-supply concept Chicago Freight Car Co |
| 4-01087-000 | 5/9 Secondary reference Arma Div Ambac Industries Inc |
NSN 3020-01-273-7687 is a Gear Sector,spur, manufactured by Rolls-Royce Plc Naval Marine, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-273-7687 has 1 manufacturer part number on file: 27756-C (Rolls-Royce Plc Naval Marine).
Key specifications for 27756-C: Teeth Quantity: 160; Nominal Outside Radius: 2.512 INCHES IN; Mounting Hole Type and Quantity: 2 COUNTERBORED AXIALLY THROUGH BODY FIRST END; Mounting Hole Nominal Diameter: 0.128 INCHES AXIALLY THROUGH BODY FIRST END IN. 13 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.