PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21549-1Gearshaft Sector,spur

Aerosonic Llc · NSN 3040-01-317-7491 · FSC 3040 · No Item Name Available
Verified by PartsTable
NSN 3040-01-317-7491 — this item is cataloged by the U.S. Government under National Stock Number 3040-01-317-7491. Primary manufacturer part number: 21549-1.
Features
  • Gearshaft Sector,spur — FSC 3040
  • General Characteristics Item Description: INCLUDES GEAR SECTOR,AIRSPEED HAIRSPRING,COUNTERWEIGHT,JEWEL BUSHING PIVOT,SHAFT,AND MOUNTED CAP JEWEL
  • 2 verified cross-references
  • Primary manufacturer: Aerosonic Llc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Gearshaft Sector,spur, cataloged under National Stock Number 3040-01-317-7491, is classified within Federal Supply Class 3040 (No Item Name Available) of the Mechanical Power Transmission Equipment group. The primary manufacturer of record is Aerosonic Llc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 9 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN3040-01-317-7491
Primary Part Number21549-1
Item NameGearshaft Sector,spur
FSC / FSG3040 / 30 — No Item Name Available
ManufacturerAerosonic Llc
StatusACTIVE
General Characteristics Item DescriptionINCLUDES GEAR SECTOR,AIRSPEED HAIRSPRING,COUNTERWEIGHT,JEWEL BUSHING PIVOT,SHAFT,AND MOUNTED CAP JEWEL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 9
4820-00-031-7453 INTERCHANGEABLE
Seat,valve
6610-00-939-261621549 INTERCHANGEABLE
Shaft Assy,rocking
Aerosonic Llc
1650-00-992-3676215491 INTERCHANGEABLE
Cup,valve,brake Power or Manual
Hydro-Aire Aerospace Corp
4820-01-107-709421751 INTERCHANGEABLE
Valve,calibrated Flow
Kold-Ban International Ltd Div Kbi
6130-01-137-128621549-1 INTERCHANGEABLE
Panel,bottom,rear
Smiths Aerospace, Inc., Electronic Systems-Grand Rapids
4730-01-198-845721549 INTERCHANGEABLE
Trap,steam
Spirax Sarco Inc Dba Spirax Sarco
5996-01-275-283321-549 INTERCHANGEABLE
Amplifier,magnetic
Radioshack Corporation Dba Radioshack
4730-01-396-5063 INTERCHANGEABLE
Reducer,boss
5935-01-414-582821549 INTERCHANGEABLE
Connector,receptacle,electrical
Viavi Solutionsllc
Cross-Reference Index
Part NumberManufacturer
21549 Aerosonic Llc (USA)
21549-1 PRIMARY Aerosonic Llc (USA)
Related Parts
4820-00-031-7453INTERCHANGEABLE
SEAT,VALVE
6610-00-939-2616INTERCHANGEABLE
SHAFT ASSY,ROCKING
21549
1650-00-992-3676INTERCHANGEABLE
CUP,VALVE,BRAKE POWER OR MANUAL
215491
4820-01-107-7094INTERCHANGEABLE
VALVE,CALIBRATED FLOW
21751
6130-01-137-1286INTERCHANGEABLE
PANEL,BOTTOM,REAR
21549-1
4730-01-198-8457INTERCHANGEABLE
TRAP,STEAM
21549
5996-01-275-2833INTERCHANGEABLE
AMPLIFIER,MAGNETIC
21-549
4730-01-396-5063INTERCHANGEABLE
REDUCER,BOSS
5935-01-414-5828INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
21549

Frequently Asked Questions

What is NSN 3040-01-317-7491?

NSN 3040-01-317-7491 is a Gearshaft Sector,spur, manufactured by Aerosonic Llc, classified under FSC 3040 (No Item Name Available). Status: active.

What are the part numbers for NSN 3040-01-317-7491?

NSN 3040-01-317-7491 has 2 cross-referenced part numbers: 21549 (Aerosonic Llc), 21549-1 (Aerosonic Llc).

What NSN replaces 3040-01-317-7491?

There are 9 known substitutes for 3040-01-317-7491: 4820-00-031-7453, 6610-00-939-2616, 1650-00-992-3676 and 6 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21549-1?

Key specifications for 21549-1: End Item Identification: 6610-01-119-2298; General Characteristics Item Description: INCLUDES GEAR SECTOR,AIRSPEED HAIRSPRING,COUNTERWEIGHT,JEWEL BUSHING PIVOT,SHAFT,AND MOUNTED CAP JEWEL. 2 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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