The Gear,antibacklash,spur, cataloged under National Stock Number 3020-00-971-2045, 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 Designatronics Inc Perfect Gear and Instrument Div. Government technical data includes 24 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-971-2045 |
| Primary Part Number | ACM8-120 |
| Item Name | Gear,antibacklash,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Designatronics Inc Perfect Gear and Instrument Div |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.313 INCHES FIRST END IN |
| Teeth Quantity | 120 |
| Clamping Surface Nominal Length | 0.250 INCHES FIRST END IN |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.281 INCHES FIRST END IN |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE HUB |
| Material Document and Classification | SAE AA2024 ASSN STD SINGLE MATERIAL RESPONSE FIRST GEAR |
| Material Document and Classification | SAE AA2024 ASSN STD SINGLE MATERIAL RESPONSE SECOND GEAR |
| Pitch Diameter | 2.5000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | SPLIT FIRST END |
| Nominal Outside Diameter | 2.5417 INCHES IN |
| Surface Treatment | PASSIVATE HUB |
| Surface Treatment | ANODIZE SECOND GEAR |
| Surface Treatment | ANODIZE FIRST GEAR |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL CORROSION RESISTING SPRING |
| Material | ALUMINUM ALLOY 2024 SECOND GEAR |
| Material | ALUMINUM ALLOY 2024 FIRST GEAR |
| Material | STEEL COMP 303SE HUB |
| Attachment Method | CLAMP |
| Face Nominal Width | 0.104 INCHES IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| AB150-120CT2498 | Southern Gear & Machine Inc (USA) |
| ACM8-120 PRIMARY | Designatronics Inc Perfect Gear and Instrument Div (USA) |
| Reference | Meaning |
|---|---|
| AC48X-120 | 5/9 Secondary reference W. M. Berg, Inc. |
NSN 3020-00-971-2045 is a Gear,antibacklash,spur, manufactured by Designatronics Inc Perfect Gear and Instrument Div, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-971-2045 has 2 manufacturer part numbers on file: AB150-120CT2498 (Southern Gear & Machine Inc), ACM8-120 (Designatronics Inc Perfect Gear and Instrument Div).
Key specifications for ACM8-120: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.313 INCHES FIRST END IN; Teeth Quantity: 120; Clamping Surface Nominal Length: 0.250 INCHES FIRST END IN. 24 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.
NSN 3020-00-971-2045 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.