PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

203-21Gearshaft,spur

Ontic Engineering & Manufacturing, Inc Dba Ontic Us · NSN 3040-00-180-5458 · FSC 3040 · No Item Name Available
Verified by PartsTable
NSN 3040-00-180-5458 — this item is cataloged by the U.S. Government under National Stock Number 3040-00-180-5458. Primary manufacturer part number: 203-21.
Features
  • Gearshaft,spur — FSC 3040
  • Gear Location on Shaft: MIDPOINT BETWEEN ENDS OF SHAFT
  • Shaft Largest Diameter: 0.750 INCHES NOMINAL IN
  • Shaft End Type: PLAIN AND SLOTTED
  • Shaft Material: STEEL
  • Diametral Pitch: 10
  • Shaft End Size: 0.625 INCHES AND 0.750 INCHES IN
  • Teeth Quantity: 12
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Gearshaft,spur, cataloged under National Stock Number 3040-00-180-5458, is classified within Federal Supply Class 3040 (No Item Name Available) of the Mechanical Power Transmission Equipment group. The primary manufacturer of record is Ontic Engineering & Manufacturing, Inc Dba Ontic Us. Government technical data includes 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3040-00-180-5458
Primary Part Number203-21
Item NameGearshaft,spur
FSC / FSG3040 / 30 — No Item Name Available
ManufacturerOntic Engineering & Manufacturing, Inc Dba Ontic Us
StatusACTIVE
Gear Location on ShaftMIDPOINT BETWEEN ENDS OF SHAFT
Shaft Largest Diameter0.750 INCHES NOMINAL IN
Shaft End TypePLAIN AND SLOTTED
Shaft MaterialSTEEL
Diametral Pitch10
Shaft End Size0.625 INCHES AND 0.750 INCHES IN
Teeth Quantity12
Gear Outside Diameter1.359 INCHES NOMINAL IN
Shaft TypeSHOULDERED
Gear MaterialSTEEL
Face Width0.375 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5935-00-097-317220321 INTERCHANGEABLE
Connector,plug,electrical
Anderson Airmotive Inc
3110-00-156-1916 INTERCHANGEABLE
Bearing,ball,thrust
6130-00-312-8241M430774-1 INTERCHANGEABLE
Rectifier,metallic
L3 Technologies, Inc. Div Communication Systems-East
6515-00-333-880066-2742 INTERCHANGEABLE
Forceps,dressing
Sklar Corporation Dba Sklar Instruments
6350-00-388-440310300077 INTERCHANGEABLE
Buzzer
Us Army Aviation and Missile Command
5330-00-924-9040697524A INTERCHANGEABLE
Gasket
Hamilton Sundstrand Corporation
4820-01-075-5091A6792-026-156 INTERCHANGEABLE
Stem,fluid Valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
4820-01-075-735207736002156 INTERCHANGEABLE
Seat,valve
Emerson Automation Solutions Final Control Us Lp Div Navy Product Team
5998-01-077-6322 INTERCHANGEABLE
Electronic Components Assembly
4820-01-177-3886 INTERCHANGEABLE
Valve,safety Relief
Cross-Reference Index
Part NumberManufacturer
203-21 PRIMARY Ontic Engineering & Manufacturing, Inc Dba Ontic Us (USA)
203-21 Donallco Inc (USA)
Related Parts
5935-00-097-3172INTERCHANGEABLE
CONNECTOR,PLUG,ELECTRICAL
20321
3110-00-156-1916INTERCHANGEABLE
BEARING,BALL,THRUST
6130-00-312-8241INTERCHANGEABLE
RECTIFIER,METALLIC
M430774-1
6515-00-333-8800INTERCHANGEABLE
FORCEPS,DRESSING
66-2742
6350-00-388-4403INTERCHANGEABLE
BUZZER
10300077
5330-00-924-9040INTERCHANGEABLE
GASKET
697524A
4820-01-075-5091INTERCHANGEABLE
STEM,FLUID VALVE
A6792-026-156
4820-01-075-7352INTERCHANGEABLE
SEAT,VALVE
07736002156
5998-01-077-6322INTERCHANGEABLE
ELECTRONIC COMPONENTS ASSEMBLY
4820-01-177-3886INTERCHANGEABLE
VALVE,SAFETY RELIEF
5920-01-293-3965INTERCHANGEABLE
FUSEHOLDER,BLOCK
5120-01-349-1470INTERCHANGEABLE
WRENCH,BOX AND OPEN END,COMBINAT

Frequently Asked Questions

What is NSN 3040-00-180-5458?

NSN 3040-00-180-5458 is a Gearshaft,spur, manufactured by Ontic Engineering & Manufacturing, Inc Dba Ontic Us, classified under FSC 3040 (No Item Name Available). Status: active.

What are the part numbers for NSN 3040-00-180-5458?

NSN 3040-00-180-5458 has 2 cross-referenced part numbers: 203-21 (Ontic Engineering & Manufacturing, Inc Dba Ontic Us), 203-21 (Donallco Inc).

What NSN replaces 3040-00-180-5458?

There are 12 known substitutes for 3040-00-180-5458: 5935-00-097-3172, 3110-00-156-1916, 6130-00-312-8241 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 203-21?

Key specifications for 203-21: Gear Location on Shaft: MIDPOINT BETWEEN ENDS OF SHAFT; Shaft Largest Diameter: 0.750 INCHES NOMINAL IN; Shaft End Type: PLAIN AND SLOTTED; Overall Length: 21.187 INCHES NOMINAL IN. 12 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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