The Gear,spur, cataloged under National Stock Number 3020-00-174-5579, 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 Alfa Laval Inc. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-174-5579 |
| Primary Part Number | A989PC72 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Alfa Laval Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.685 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 1.181 INCHES SECOND END IN |
| Hub Nominal Diameter | 1.850 INCHES FIRST END IN |
| Teeth Quantity | 46 |
| Body Style | WEBBED, OFFSET, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 1 PLAIN AND 1 THREADED TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.660 INCHES FIRST END IN |
| Mounting Hole Nominal Diameter | 0.242 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Style Designator | ONE PROTRUDING HUB, ONE FLUSH HUB |
| Material Document and Classification | MIL-M-16576,GRADE A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.8750 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN BOTH ENDS |
| Mounting Hole Nominal Thread Size | 0.312 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Nominal Outside Diameter | 3.000 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | COPPER ALLOY OVERALL |
| Mounting Hole Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) TRANSVERSELY THROUGH HUB FIRST END |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.551 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 |
NSN 3020-00-174-5579 is a Gear,spur, manufactured by Alfa Laval Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-174-5579 has 3 manufacturer part numbers on file: A989PC72 (Alfa Laval Inc), 99121717 (Alfa Laval Inc), A990PC72 (Alfa Laval Inc).
6 possible matches (shared part number, not a government interchangeability claim): 2915-00-483-4300, 5310-00-639-3563, 3030-00-948-9626. Verify interchangeability with system specifications before substitution.
Key specifications for A989PC72: Bore Nominal Diameter: 0.685 INCHES BOTH ENDS IN; Hub Nominal Diameter: 1.181 INCHES SECOND END IN; Hub Nominal Diameter: 1.850 INCHES FIRST END IN; Teeth Quantity: 46. 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.