The Gear,spur, cataloged under National Stock Number 3020-00-245-7665, 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 The Dewey Electronics Corporation Div Pitometer Log Division. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 3020-00-245-7665 |
| Primary Part Number | K57 |
| Item Name | Gear,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | The Dewey Electronics Corporation Div Pitometer Log Division |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.253 INCHES BOTH ENDS IN |
| Teeth Quantity | 78 |
| Body Style | PLAIN, SOLID |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 4 PLAIN AXIALLY THROUGH BODY FIRST END |
| Mounting Hole Nominal Diameter | 0.116 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Style Designator | HUBLESS |
| Material Document and Classification | MIL-C-15345 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 2.4373 INCHES MINIMUM AND 2.4375 INCHES MAXIMUM IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 2.4485 INCHES IN |
| Pressure Angle | 14.5000 DEGREES |
| Material | COPPER ALLOY OVERALL |
| Bolt Hole Circle Nominal Diameter | 0.938 INCHES AXIALLY THROUGH BODY FIRST END IN |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.125 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 |
|---|---|
| K57 PRIMARY | The Dewey Electronics Corporation Div Pitometer Log Division (USA) |
| K57 | Southern Gear & Machine Inc (USA) |
| Reference | Meaning |
|---|---|
| 7-4PC59 | 5/9 Secondary reference The Dewey Electronics Corporation Div Pitometer Log Division |
| 7-1AALT1PC59 | 5/9 Secondary reference The Dewey Electronics Corporation Div Pitometer Log Division |
| 7-3APC59 | 5/9 Secondary reference The Dewey Electronics Corporation Div Pitometer Log Division |
| K57PCALL | 5/9 Secondary reference The Dewey Electronics Corporation Div Pitometer Log Division |
| 208-1PC49 | 5/9 Secondary reference The Dewey Electronics Corporation Div Pitometer Log Division |
| 7-1BALT1PC59 | 5/9 Secondary reference The Dewey Electronics Corporation Div Pitometer Log Division |
| SK872APC49 | 5/9 Secondary reference The Dewey Electronics Corporation Div Pitometer Log Division |
| 7-3BPC59 | 5/9 Secondary reference The Dewey Electronics Corporation Div Pitometer Log Division |
NSN 3020-00-245-7665 is a Gear,spur, manufactured by The Dewey Electronics Corporation Div Pitometer Log Division, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-245-7665 has 2 manufacturer part numbers on file: K57 (The Dewey Electronics Corporation Div Pitometer Log Division), K57 (Southern Gear & Machine Inc).
2 possible matches (shared part number, not a government interchangeability claim): 3110-01-278-9442, 6685-01-599-9831. Verify interchangeability with system specifications before substitution.
Key specifications for K57: Bore Nominal Diameter: 0.253 INCHES BOTH ENDS IN; Teeth Quantity: 78; Body Style: PLAIN, SOLID; Bore Style: PLAIN BOTH ENDS. 16 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.