The Gear-Slip Clutch,spur, cataloged under National Stock Number 3020-00-718-0839, 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 Secs Inc. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-718-0839 |
| Primary Part Number | SC57 |
| Item Name | Gear-Slip Clutch,spur |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Secs Inc |
| Status | ACTIVE |
| Hub Nominal Diameter | 0.688 INCHES FIRST END IN |
| Bore Style | PLAIN BOTH ENDS |
| Nominal Distance Between Body Face and Protruding Hub End | 0.279 INCHES FIRST END IN |
| Nominal Distance Between Body Face and Protruding Hub End | 0.083 INCHES SECOND END IN |
| Nominal Overall Length | 0.460 INCHES IN |
| Style Designator | ADJUSTABLE TORQUE, COIL SPRING LOADED |
| Bore Nominal Depth | 0.124 INCHES BOTH ENDS IN |
| Material Document and Classification | DELRIN 150 NC-10 ASSN STD SINGLE MATERIAL RESPONSE BUSHING |
| Material Document and Classification | MIL-S-17919 MIL STD SINGLE MATERIAL RESPONSE SPRING |
| Material Document and Classification | QQ-A-268,ALLOY 2024 T4 FED SPEC SINGLE MATERIAL RESPONSE HUB |
| Material Document and Classification | QQ-S-763 CLASS 303 FED SPEC SINGLE MATERIAL RESPONSE FIRST GEAR |
| Hub Style Designator | PINNED FIRST END |
| Surface Treatment | CADMIUM SPRING |
| Surface Treatment | PASSIVATE AND ANODIZE OVERALL |
| Material | STEEL COMP 303 FIRST GEAR |
| Material | STEEL SPRING |
| Material | ALUMINUM ALLOY 2024 HUB |
| Material | PLASTIC BUSHING |
| Material | ALUMINUM ALLOY 2024 CLAMP |
| Nominal Distance Between Face Edge and Body End | 0.083 INCHES IN |
| Face Nominal Width | 0.458 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 |
|---|---|
| SC57 PRIMARY | Secs Inc (USA) |
| Reference | Meaning |
|---|---|
| 144-0128-001 | 5/2 Secondary reference U.S. Government activity |
NSN 3020-00-718-0839 is a Gear-Slip Clutch,spur, manufactured by Secs Inc, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-718-0839 has 1 manufacturer part number on file: SC57 (Secs Inc).
Key specifications for SC57: Hub Nominal Diameter: 0.688 INCHES FIRST END IN; Bore Style: PLAIN BOTH ENDS; Nominal Distance Between Body Face and Protruding Hub End: 0.279 INCHES FIRST END IN; Nominal Distance Between Body Face and Protruding Hub End: 0.083 INCHES SECOND END IN. 21 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.