The Gear,helical, cataloged under National Stock Number 3020-00-706-0640, 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 Telemechanics Inc. Government technical data includes 20 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-00-706-0640 |
| Primary Part Number | 159885 |
| Item Name | Gear,helical |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Telemechanics Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.3750 INCHES BOTH ENDS IN |
| Helix Angle | 17.0000 DEGREES |
| Hub Nominal Diameter | 0.560 INCHES FIRST END IN |
| Teeth Quantity | 29 |
| Body Style | PLAIN, SOLID |
| Tooth Direction | RIGHT |
| Bore Style | PLAIN BOTH ENDS |
| Mounting Hole Type and Quantity | 1 PLAIN TRANSVERSELY THROUGH HUB FIRST END |
| Nominal Distance Between Body Face and Protruding Hub End | 0.500 INCHES FIRST END IN |
| Mounting Hole Nominal Diameter | 0.140 INCHES TRANSVERSELY THROUGH HUB FIRST END IN |
| Teeth Type | SINGLE HELIX |
| Style Designator | PROTRUDING HUB |
| Pitch Diameter | 1.0000 INCHES NOMINAL IN |
| Tooth Form | SPECIAL |
| Hub Style Designator | PLAIN FIRST END |
| Nominal Outside Diameter | 1.0660 INCHES IN |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL OVERALL |
| Attachment Method | MOUNTING HOLE |
| Face Nominal Width | 0.380 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 |
| Part Number | Manufacturer |
|---|---|
| 159885 PRIMARY | Telemechanics Inc (USA) |
| Reference | Meaning |
|---|---|
| 159885 | C/1 Advisory reference — outside the item-of-supply concept American Telephone and Telegraph Co |
| 159885 | 5/9 Secondary reference At and T Corp |
NSN 3020-00-706-0640 is a Gear,helical, manufactured by Telemechanics Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-706-0640 has 1 manufacturer part number on file: 159885 (Telemechanics Inc).
1 possible match (shared part number, not a government interchangeability claim): 5950-01-339-6674. Verify interchangeability with system specifications before substitution.
Key specifications for 159885: Bore Nominal Diameter: 0.3750 INCHES BOTH ENDS IN; Helix Angle: 17.0000 DEGREES; Hub Nominal Diameter: 0.560 INCHES FIRST END IN; Teeth Quantity: 29. 20 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.