The Gear,internal, cataloged under National Stock Number 3020-01-221-3708, 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 Roller Bearing Co of America, Inc Div Pic Design. Government technical data includes 12 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-221-3708 |
| Primary Part Number | CD3-156 |
| Item Name | Gear,internal |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Roller Bearing Co of America, Inc Div Pic Design |
| Status | ACTIVE |
| Teeth Quantity | 156 |
| Body Style | PLAIN, SOLID |
| Precision Classification | QUALITY NUMBER 10 |
| Teeth Type | SPUR |
| Nominal Overall Length | 0.125 INCHES IN |
| Style Designator | PLAIN RING |
| Pitch Diameter | 3.2500 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Nominal Outside Diameter | 3.998 INCHES IN |
| Surface Treatment | ANODIZE OVERALL |
| Pressure Angle | 20.0000 DEGREES |
| Material | ALUMINUM ALLOY 2024 OVERALL |
| 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 |
|---|---|
| LMA-E3-156 | Nordex, Incorporated Dba Nordex Inc (USA) |
| CD3-156 PRIMARY | Roller Bearing Co of America, Inc Div Pic Design (USA) |
| X9-156-A | Designatronics Incorporated Div Sterling Instruments Div (USA) |
| Reference | Meaning |
|---|---|
| DCD3T156 | 5/9 Secondary reference Allied Devices Corp Dba Absolute Precision Co |
| G306687 | C/1 Advisory reference — outside the item-of-supply concept Lucent Technologies Inc Dba Federal Marketing Group |
| N48A4-156 | 5/9 Secondary reference W. M. Berg, Inc. |
| LMA-E3-156 | 5/9 Secondary reference Nordex Inc |
NSN 3020-01-221-3708 is a Gear,internal, manufactured by Roller Bearing Co of America, Inc Div Pic Design, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-221-3708 has 3 manufacturer part numbers on file: LMA-E3-156 (Nordex, Incorporated Dba Nordex Inc), CD3-156 (Roller Bearing Co of America, Inc Div Pic Design), X9-156-A (Designatronics Incorporated Div Sterling Instruments Div).
Key specifications for CD3-156: Teeth Quantity: 156; Body Style: PLAIN, SOLID; Precision Classification: QUALITY NUMBER 10; Teeth Type: SPUR. 12 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.