PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

6661Gear,internal

Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic · NSN 3020-00-448-0992 · FSC 3020 · No Item Name Available
Verified by PartsTable
NSN 3020-00-448-0992 — this item is cataloged by the U.S. Government under National Stock Number 3020-00-448-0992. Primary manufacturer part number: 6661.
Features
  • Gear,internal — FSC 3020
  • Bolt Hole Circle Nominal Diameter: 8.750 INCHES AXIALLY THROUGH BODY FIRST END IN
  • Mounting Hole Type and Quantity: 8 PLAIN AXIALLY THROUGH BODY FIRST END
  • Attachment Method: MOUNTING HOLE
  • Pitch Diameter: 7.8430 INCHES MINIMUM AND 7.8480 INCHES MAXIMUM IN
  • Tooth Form: STANDARD
  • Style Designator: PLAIN RING
  • Teeth Type: SPUR
Applications
  • Power transmission and speed reduction
  • Rotary motion transfer
  • Torque multiplication
  • Applications requiring Iron Overall construction
General Description

The Gear,internal, cataloged under National Stock Number 3020-00-448-0992, is classified within Federal Supply Class 3020 (No Item Name Available) of the Mechanical Power Transmission Equipment group. The primary manufacturer of record is Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. Government technical data includes 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3020-00-448-0992
Primary Part Number6661
Item NameGear,internal
FSC / FSG3020 / 30 — No Item Name Available
ManufacturerTwin Disc, Incorporated Dba Twin Disc Mid-Atlantic
StatusACTIVE
Bolt Hole Circle Nominal Diameter8.750 INCHES AXIALLY THROUGH BODY FIRST END IN
Mounting Hole Type and Quantity8 PLAIN AXIALLY THROUGH BODY FIRST END
Attachment MethodMOUNTING HOLE
Pitch Diameter7.8430 INCHES MINIMUM AND 7.8480 INCHES MAXIMUM IN
Tooth FormSTANDARD
Style DesignatorPLAIN RING
Teeth TypeSPUR
Body StylePLAIN, SOLID
Nominal Outside Diameter9.4975 INCHES IN
Nominal Overall Length0.6250 INCHES IN
MaterialIRON OVERALL
Teeth Quantity47
Pressure Angle20.0000 DEGREES
Mounting Hole Nominal Diameter0.3280 INCHES AXIALLY THROUGH BODY FIRST END IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5210-00-083-0288599-9642-10 INTERCHANGEABLE
Gage Stock,thickness
Brown & Sharpe, Inc. Div Precision Measuring Instruments, Tesa Usa
3930-00-145-6366 INTERCHANGEABLE
Block,slide
5960-00-685-8998 INTERCHANGEABLE
Electron Tube
6532-00-914-3069X610NTZS-CA INTERCHANGEABLE
Shirt,operating,surgical
Medline Industries, Lp
5935-01-184-259146-619730 INTERCHANGEABLE
Adapter,electrical Plug,quick Di
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple
4820-01-225-22996661 INTERCHANGEABLE
Piston,valve
Imi Cash Valve Inc
6505-01-255-90276661 INTERCHANGEABLE
Mexiletine Hydrochloride Capsule
Boehringer Ingelheim Pharmaceuticals Inc
4020-01-352-27293316661 INTERCHANGEABLE
Rope,fibrous
Plymkraft, Inc. Dba Plymkraft Inc Div Columbian Specialty Products Div
6515-01-372-88172970006713 INTERCHANGEABLE
Heel Cup,orthopedic
Alimed, Inc. Dba Alimed Inc
5340-01-663-6109777-1 INTERCHANGEABLE
Holder,door
Eastern Co Div Eberhard Manufacturing
Cross-Reference Index
Part NumberManufacturer
6661 Minnpar, Llc Dba Minnpar (USA)
6661 Barber-Greene Co (USA)
6661 PRIMARY Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA)
Related Parts
5210-00-083-0288INTERCHANGEABLE
GAGE STOCK,THICKNESS
599-9642-10
3930-00-145-6366INTERCHANGEABLE
BLOCK,SLIDE
5960-00-685-8998INTERCHANGEABLE
ELECTRON TUBE
6532-00-914-3069INTERCHANGEABLE
SHIRT,OPERATING,SURGICAL
X610NTZS-CA
5935-01-184-2591INTERCHANGEABLE
ADAPTER,ELECTRICAL PLUG,QUICK DI
46-619730
4820-01-225-2299INTERCHANGEABLE
PISTON,VALVE
6661
6505-01-255-9027INTERCHANGEABLE
MEXILETINE HYDROCHLORIDE CAPSULE
6661
4020-01-352-2729INTERCHANGEABLE
ROPE,FIBROUS
3316661
6515-01-372-8817INTERCHANGEABLE
HEEL CUP,ORTHOPEDIC
2970006713
5340-01-663-6109INTERCHANGEABLE
HOLDER,DOOR
777-1

Frequently Asked Questions

What is NSN 3020-00-448-0992?

NSN 3020-00-448-0992 is a Gear,internal, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 3020 (No Item Name Available). Status: active.

What are the part numbers for NSN 3020-00-448-0992?

NSN 3020-00-448-0992 has 3 cross-referenced part numbers: 6661 (Minnpar, Llc Dba Minnpar), 6661 (Barber-Greene Co), 6661 (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).

What NSN replaces 3020-00-448-0992?

There are 10 known substitutes for 3020-00-448-0992: 5210-00-083-0288, 3930-00-145-6366, 5960-00-685-8998 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 6661?

Key specifications for 6661: Bolt Hole Circle Nominal Diameter: 8.750 INCHES AXIALLY THROUGH BODY FIRST END IN; Mounting Hole Type and Quantity: 8 PLAIN AXIALLY THROUGH BODY FIRST END; Attachment Method: MOUNTING HOLE; Pitch Diameter: 7.8430 INCHES MINIMUM AND 7.8480 INCHES MAXIMUM IN. 15 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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