The Gear,spur, cataloged under National Stock Number 3020-00-159-8597, 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 Miller-Holzwarth Inc.. Government technical data includes 14 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. 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 | 3020-00-159-8597 |
| Primary Part Number | B7173 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Miller-Holzwarth Inc. |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.500 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.875 INCHES FIRST END IN |
| Teeth Quantity | 48 |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.375 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 2.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 2.083 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | PLASTIC POLYAMIDE NYLON OVERALL |
| Face Nominal Width | 0.250 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 |
|---|---|
| B7173 PRIMARY | Miller-Holzwarth Inc. (USA) |
NSN 3020-00-159-8597 is a Gear,spur, manufactured by Miller-Holzwarth Inc., classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-159-8597 has 1 manufacturer part number on file: B7173 (Miller-Holzwarth Inc.).
1 possible match (shared part number, not a government interchangeability claim): 4330-01-475-4031. Verify interchangeability with system specifications before substitution.
Key specifications for B7173: Bore Nominal Diameter: 0.500 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.875 INCHES FIRST END IN; Teeth Quantity: 48; Body Style: PLAIN, SOLID. 14 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.