PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21121Gearshaft,spur

Moog Inc. Dba Ampac-Isp Corp · NSN 3040-01-185-4434 · FSC 3040 · No Item Name Available
Verified by PartsTable
NSN 3040-01-185-4434 — this item is cataloged by the U.S. Government under National Stock Number 3040-01-185-4434. Primary manufacturer part number: 21121.
Features
  • Gearshaft,spur — FSC 3040
  • Shaft End Size: 1.498 INCHES IN
  • Shaft Material: STEEL
  • Shaft Type: SHOULDERED
  • Shaft End Type: SPLINED INVOLUTE
  • Gear Material: STEEL
  • 3 verified cross-references
  • Primary manufacturer: Moog Inc. Dba Ampac-Isp Corp
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Gearshaft,spur, cataloged under National Stock Number 3040-01-185-4434, is classified within Federal Supply Class 3040 (No Item Name Available) of the Mechanical Power Transmission Equipment group. The primary manufacturer of record is Moog Inc. Dba Ampac-Isp Corp. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 1 manufacturer, 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
NSN3040-01-185-4434
Primary Part Number21121
Item NameGearshaft,spur
FSC / FSG3040 / 30 — No Item Name Available
ManufacturerMoog Inc. Dba Ampac-Isp Corp
StatusACTIVE
Shaft End Size1.498 INCHES IN
Shaft MaterialSTEEL
Shaft TypeSHOULDERED
Shaft End TypeSPLINED INVOLUTE
Gear MaterialSTEEL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5355-00-144-698621-1-21 INTERCHANGEABLE
Dial,control
Vishay Sprague Inc
6210-00-152-38692112-1 INTERCHANGEABLE
Light,indicator
Safran Electronics & Defense, Avionics Usa, Llc
5120-00-264-3796 INTERCHANGEABLE
Wrench,adjustable
5360-00-312-46183238986 INTERCHANGEABLE
Spring,helical,torsion
Hatch & Kirk, Inc.
5905-00-439-6397211-21 INTERCHANGEABLE
Resistor,thermal
Keysight Technologies Inc
5330-00-523-668164130 INTERCHANGEABLE
Gasket
Curtiss-Wright Controls, Inc. Div Actuation Division
7510-00-634-020900032 INTERCHANGEABLE
Protector,document
C Line Products, Inc.
6750-01-077-4741101 7383 INTERCHANGEABLE
Film,photographic
Eastman Kodak Co
3010-01-116-7201930-21065 INTERCHANGEABLE
Actuator,hydraulic-Pneumatic,rot
Moog Inc. Dba Ampac-Isp Corp
3020-01-185-122721117 INTERCHANGEABLE
Gear Rack
Moog Inc. Dba Ampac-Isp Corp
Cross-Reference Index
Part NumberManufacturer
930-21065 Moog Inc. Dba Ampac-Isp Corp (USA)
21121 PRIMARY Moog Inc. Dba Ampac-Isp Corp (USA)
930-21065 ITEM 1 Moog Inc. Dba Ampac-Isp Corp (USA)
Related Parts
5355-00-144-6986INTERCHANGEABLE
DIAL,CONTROL
21-1-21
6210-00-152-3869INTERCHANGEABLE
LIGHT,INDICATOR
2112-1
5120-00-264-3796INTERCHANGEABLE
WRENCH,ADJUSTABLE
5360-00-312-4618INTERCHANGEABLE
SPRING,HELICAL,TORSION
3238986
5905-00-439-6397INTERCHANGEABLE
RESISTOR,THERMAL
211-21
5330-00-523-6681INTERCHANGEABLE
GASKET
64130
7510-00-634-0209INTERCHANGEABLE
PROTECTOR,DOCUMENT
00032
6750-01-077-4741INTERCHANGEABLE
FILM,PHOTOGRAPHIC
101 7383
3010-01-116-7201INTERCHANGEABLE
ACTUATOR,HYDRAULIC-PNEUMATIC,ROT
930-21065
3020-01-185-1227INTERCHANGEABLE
GEAR RACK
21117
4810-01-185-4404INTERCHANGEABLE
HEAD,PORT
21116
4810-01-185-4405INTERCHANGEABLE
HEAD,TRANSFER
21118

Frequently Asked Questions

What is NSN 3040-01-185-4434?

NSN 3040-01-185-4434 is a Gearshaft,spur, manufactured by Moog Inc. Dba Ampac-Isp Corp, classified under FSC 3040 (No Item Name Available). Status: active.

What are the part numbers for NSN 3040-01-185-4434?

NSN 3040-01-185-4434 has 3 cross-referenced part numbers: 930-21065 (Moog Inc. Dba Ampac-Isp Corp), 21121 (Moog Inc. Dba Ampac-Isp Corp), 930-21065 ITEM 1 (Moog Inc. Dba Ampac-Isp Corp).

What NSN replaces 3040-01-185-4434?

There are 12 known substitutes for 3040-01-185-4434: 5355-00-144-6986, 6210-00-152-3869, 5120-00-264-3796 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21121?

Key specifications for 21121: Shaft End Size: 1.498 INCHES IN; Shaft Material: STEEL; Shaft Type: SHOULDERED; Shaft End Type: SPLINED INVOLUTE. 5 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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