The Gear,antibacklash,spur, cataloged under National Stock Number 3020-01-434-8192, 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 Peerless Instrument Co., Inc. Dba Peerless Instrument Co Inc. Government technical data includes 29 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-434-8192 |
| Primary Part Number | 2351-10523-01 |
| Item Name | Gear,antibacklash,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Peerless Instrument Co., Inc. Dba Peerless Instrument Co Inc |
| Status | ACTIVE |
| Bore Nominal Diameter | 0.2497 INCHES BOTH ENDS IN |
| Hub Nominal Diameter | 0.3120 INCHES SECOND END IN |
| Teeth Quantity | 288 |
| Clamping Surface Nominal Length | 0.2480 INCHES SECOND END IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC 2ND TREATMENT RESPONSE RETAINING RING |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC 2ND TREATMENT RESPONSE RETAINING RINGUNABLE TO DECODE |
| Surface Treatment Document and Classification | QQ-P-35 TYPE 1 FED SPEC 1ST TREATMENT RESPONSE SPRING |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.3500 INCHES SECOND END IN |
| Precision Classification | QUALITY NUMBER 12 |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM FIRST GEAR |
| Hardness Rating | 35.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM SECOND GEAR |
| Hardness Rating | 63.0 ROCKWELL SUPERFICIAL 30-N MINIMUM AND 69.0 ROCKWELL SUPERFICIAL 30-N MAXIMUM RETAINING RING |
| Style Designator | PROTRUDING HUB |
| Material Document and Classification | AMS 5520 ASSN STD 2ND MATERIAL RESPONSE RETAINING RING |
| Material Document and Classification | AMS 5643N ASSN STD 1ST MATERIAL RESPONSE FIRST GEAR |
| Material Document and Classification | AMS 5643N ASSN STD 3RD MATERIAL RESPONSE SECOND GEAR |
| Material Document and Classification | MIL-S-5059 MIL SPEC 4TH MATERIAL RESPONSE SPRING |
| Pitch Diameter | 6.0000 INCHES NOMINAL IN |
| Tooth Form | STANDARD |
| Hub Style Designator | SPLIT SECOND END |
| Nominal Outside Diameter | 6.0417 INCHES IN |
| Surface Treatment | PASSIVATE SPRING |
| Surface Treatment | PASSIVATE RETAINING RING |
| Surface Treatment | PASSIVATE SPRINGUNABLE TO DECODE |
| Pressure Angle | 20.0000 DEGREES |
| Material | STEEL COMP 302 SPRING |
| Material | STEEL CORROSION RESISTING FIRST GEAR |
| Material | STEEL CORROSION RESISTING SECOND GEAR |
| 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 |
|---|---|
| 2351-10523-01 | Peerless Instrument Co., Inc. Dba Peerless Instrument Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 2351-10523-01 | 5/9 Secondary reference U.S. Government activity |
| 2351-10523 | 7/2 Vendor item drawing reference U.S. Government activity |
| 2351-10523-01 | 3/9 Design control — primary reference Abb T and D Power Co Inc |
NSN 3020-01-434-8192 is a Gear,antibacklash,spur, manufactured by Peerless Instrument Co., Inc. Dba Peerless Instrument Co Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-434-8192 has 1 manufacturer part number on file: 2351-10523-01 (Peerless Instrument Co., Inc. Dba Peerless Instrument Co Inc).
Key specifications for 2351-10523-01: Bore Nominal Diameter: 0.2497 INCHES BOTH ENDS IN; Hub Nominal Diameter: 0.3120 INCHES SECOND END IN; Teeth Quantity: 288; Clamping Surface Nominal Length: 0.2480 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.
NSN 3020-01-434-8192 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.