The Sprocket Wheel, cataloged under National Stock Number 3020-01-108-4178, 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 Naval Sea Systems Command. Government technical data includes 27 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-01-108-4178 |
| Primary Part Number | 709-4684876 ITEM 16 |
| Item Name | Sprocket Wheel |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Hub Outside Diameter | 1.810 INCHES NOMINAL BOTH ENDS IN |
| First Step Diameter | 3.100 INCHES NOMINAL BOTH ENDS IN |
| Bore Length | 2.000 INCHES NOMINAL IN |
| Design Form | PLAIN |
| Teeth Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 55.0 ROCKWELL C MAXIMUM |
| Tooth Pitch | 2.000 INCHES NOMINAL IN |
| Outside Diameter | 4.982 INCHES NOMINAL IN |
| Keying Facility Type | KEYWAY |
| Second Step Length | 0.656 INCHES NOMINAL AA END IN |
| Second Step Length | 0.651 INCHES NOMINAL BB END IN |
| Quantity | 1 |
| Style Designator | PLAIN |
| Metallic Hardness Rating and Location | 40.0 ROCKWELL C MINIMUM BODY AND 55.0 ROCKWELL C MAXIMUM BODY |
| Material Document and Classification | MIL-S-7720 MIL SPEC SINGLE MATERIAL RESPONSE |
| Pitch Diameter | 4.610 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Teeth Row Quantity | 1 |
| Teeth Quantity Per Row | 14 |
| Protruding Hub Characteristic | STEPPED |
| Hardness Rating Test Method | ROCKWELL |
| Distance From Center of Bore to Bottom of Keyway | 1.014 INCHES NOMINAL IN |
| First Step Length | 0.062 INCHES NOMINAL BOTH ENDS IN |
| Keyway Width | 0.376 INCHES NOMINAL IN |
| Bore Diameter | 1.625 INCHES MINIMUM AND 1.627 INCHES MAXIMUM IN |
| Material | STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 316 |
| Furnished Items | KEYING FACILITY |
| Face Width | 0.569 INCHES NOMINAL 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 |
|---|---|
| 709-4684876 ITEM 16 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 7094684876 ITEM 16 | 3/2 Design control — primary reference U.S. Government activity |
| 87832-1605 | D/9 Drawing number reference only U.S. Government activity |
| 4684876-0016 | 5/2 Secondary reference U.S. Government activity |
| 87832-1605 ITEM 16 | 3/2 Design control — primary reference U.S. Government activity |
| 709-4684876 | D/9 Drawing number reference only U.S. Government activity |
NSN 3020-01-108-4178 is a Sprocket Wheel, manufactured by Naval Sea Systems Command, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-01-108-4178 has 1 manufacturer part number on file: 709-4684876 ITEM 16 (Naval Sea Systems Command).
5 possible matches (shared part number, not a government interchangeability claim): 3040-01-121-9535, 2520-01-123-8898, 2520-01-125-0061. Verify interchangeability with system specifications before substitution.
Key specifications for 709-4684876 ITEM 16: Hub Outside Diameter: 1.810 INCHES NOMINAL BOTH ENDS IN; First Step Diameter: 3.100 INCHES NOMINAL BOTH ENDS IN; Bore Length: 2.000 INCHES NOMINAL IN; Design Form: PLAIN. 27 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.