Material Document and Classification: QQ-B-726 CLASS A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Identification
NSN: 3020-01-352-0057
NIIN: 013520057
FSC: 3020 — Gears, Pulleys, Sprockets, and Transmission Chain
FSG: 30 — Mechanical Power Transmission Equipment
General Description
The Gear Cluster, cataloged under National Stock Number 3020-01-352-0057, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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.
Technical Specifications
Parameter
Value
NSN
3020-01-352-0057
Item Name
Gear Cluster
FSC / FSG
3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain
Status
ACTIVE
Keyway Nominal Width
0.251 INCHES BOTH ENDS IN
Bore Nominal Diameter
1.125 INCHES BOTH ENDS IN
Design Type
SPUR SECOND GEAR
Design Type
BEVEL FIRST GEAR
Bore Style
W/ KEYWAY BOTH ENDS
Nominal Overall Length
0.945 INCHES IN
Material Document and Classification
QQ-B-726 CLASS A FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Nominal Outside Diameter
8.950 INCHES SECOND GEAR IN
Nominal Distance From Bore Center to Keyway Bottom
0.688 INCHES BOTH ENDS IN
Material
COPPER ALLOY OVERALL
Construction
SOLID
Attachment Method
MOUNTING HOLE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
3020-01-352-0074805-4563091 PC 24POSSIBLE MATCH
GEAR,SPUR
Possible match (shared part number)Naval Ship Systems Command
3020-01-352-0076805-4563091 PC 12POSSIBLE MATCH
GEAR SECTOR,WORM WHEEL
Possible match (shared part number)Naval Ship Systems Command
3020-01-352-3816805-4563091 PC 10POSSIBLE MATCH
GEAR SECTOR,WORM WHEEL
Possible match (shared part number)Naval Ship Systems Command
3020-01-352-6108805-4563091 PC 9POSSIBLE MATCH
GEAR SECTOR,WORM WHEEL
Possible match (shared part number)Naval Ship Systems Command
3020-01-352-6109805-4563091 PC 11POSSIBLE MATCH
GEAR SECTOR,WORM WHEEL
Possible match (shared part number)Naval Ship Systems Command
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
805-4563091 PC 25
3/2Design control — primary reference
U.S. Government activity
4563091
D/9Drawing number reference only
U.S. Government activity
Related Parts
3020-01-352-0074POSSIBLE MATCH
GEAR,SPUR
805-4563091 PC 24
3020-01-352-0076POSSIBLE MATCH
GEAR SECTOR,WORM WHEEL
805-4563091 PC 12
3020-01-352-3816POSSIBLE MATCH
GEAR SECTOR,WORM WHEEL
805-4563091 PC 10
3020-01-352-6108POSSIBLE MATCH
GEAR SECTOR,WORM WHEEL
805-4563091 PC 9
3020-01-352-6109POSSIBLE MATCH
GEAR SECTOR,WORM WHEEL
805-4563091 PC 11
Frequently Asked Questions
What is NSN 3020-01-352-0057?
NSN 3020-01-352-0057 is a Gear Cluster, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
What NSN replaces 3020-01-352-0057?
5 possible matches (shared part number, not a government interchangeability claim): 3020-01-352-0074, 3020-01-352-0076, 3020-01-352-3816. Verify interchangeability with system specifications before substitution.
What are the specifications of 3020-01-352-0057?
Key specifications for 3020-01-352-0057: Keyway Nominal Width: 0.251 INCHES BOTH ENDS IN; Bore Nominal Diameter: 1.125 INCHES BOTH ENDS IN; Design Type: SPUR SECOND GEAR; Design Type: BEVEL FIRST GEAR. 12 specifications are documented in the U.S. Government catalog.
Is NSN 3020-01-352-0057 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
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.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.