The Gear,antibacklash,spur, cataloged under National Stock Number 3020-01-425-8212, 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 Incorporated Div Sterling Instruments Div. Government technical data includes 29 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 3020-01-425-8212 |
| Primary Part Number | S9706A-Z7D84R |
| Item Name | Gear,antibacklash,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Designatronics Incorporated Div Sterling Instruments Div |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.250 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.310 INCHES SECOND END IN |
| Teeth Quantity | 84 |
| Clamping Surface Nominal Length | 0.221 INCHES SECOND END IN |
| Surface Treatment Document and Classification | MIL-STD-171 MIL STD SINGLE TREATMENT RESPONSE FIRST GEAR |
| Surface Treatment Document and Classification | MIL-STD-171 MIL STD SINGLE TREATMENT RESPONSE FIRST GEARUNABLE TO DECODE |
| Surface Treatment Document and Classification | MIL-STD-171 MIL STD SINGLE TREATMENT RESPONSE HUB |
| Surface Treatment Document and Classification | MIL-STD-171 MIL STD SINGLE TREATMENT RESPONSE SECOND GEAR |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.221 INCHES SECOND END IN |
| Precision Classification | ACCURACY GRADE 12 |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | ASTM-A313 ASSN STD SINGLE MATERIAL RESPONSE SPRING |
| Material Document and Classification | ASTM-A582 ASSN STD SINGLE MATERIAL RESPONSE FIRST GEAR |
| Material Document and Classification | ASTM-A582 ASSN STD SINGLE MATERIAL RESPONSE HUB |
| Material Document and Classification | ASTM-A582 ASSN STD SINGLE MATERIAL RESPONSE SECOND GEAR |
| Pitch Diameter | 1.7500 INCHES NOMINAL IN |
| Hub Style Designator | SPLIT SECOND END |
| Nominal Outside Diameter | 1.790 INCHES IN |
| Surface Treatment | PASSIVATE SECOND GEAR |
| Surface Treatment | PASSIVATE HUB |
| Surface Treatment | PASSIVATE FIRST GEAR |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 303 FIRST GEAR |
| Material | STEEL COMP 302 SPRING |
| Material | STEEL COMP 303 SECOND GEAR |
| Material | STEEL COMP 303 HUB |
| Attachment Method | SLOT |
| Face Nominal Width | 0.104 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 |
|---|---|
| S9706A-Z7D84R PRIMARY | Designatronics Incorporated Div Sterling Instruments Div (USA) |
| 12373389-2 | Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service (USA) |
| Reference | Meaning |
|---|---|
| 12373389 | 5/9 Secondary reference U S Army Tank Automotive Command Amsta-Im-Mm |
| 12373389-2 | C/1 Advisory reference — outside the item-of-supply concept General Dynamics Land Systems Customer Service & Support Company Div General Dynamics Land Systems Inc |
| 12373389 | D/9 Drawing number reference only Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service |
| 12373389-2 | 5/9 Secondary reference General Dynamics-Ots, Inc. Div Ordnance and Tactical Systems |
| 12373389-2 | 5/9 Secondary reference U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 3020-01-425-8212 is a Gear,antibacklash,spur, manufactured by Designatronics Incorporated Div Sterling Instruments Div, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-425-8212 has 2 manufacturer part numbers on file: S9706A-Z7D84R (Designatronics Incorporated Div Sterling Instruments Div), 12373389-2 (Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-425-9562. Verify interchangeability with system specifications before substitution.
Key specifications for S9706A-Z7D84R: Bore Nominal Diameter: 0.250 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.310 INCHES SECOND END IN; Teeth Quantity: 84; Clamping Surface Nominal Length: 0.221 INCHES SECOND END IN. 29 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.