PartsTable TECHNICAL DATA SHEET
OCTOBER 2026Technical Data Sheet

MS21209F4-20Insert,screw Thread

National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use · NSN 5325-00-721-7498 · FSC 5325 · No Item Name Available
Verified by PartsTable
NSN 5325-00-721-7498 — this item is cataloged by the U.S. Government under National Stock Number 5325-00-721-7498. Primary manufacturer part number: MS21209F4-20.
Features
  • Insert,screw Thread — FSC 5325
  • 38 verified cross-references
  • Primary manufacturer: National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
General Description

The Insert,screw Thread, cataloged under National Stock Number 5325-00-721-7498, is classified within Federal Supply Class 5325 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use. This item has 38 commercial cross-references from 26 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the government interchangeability database. Current acquisition status: Cancelled.

Catalog Facts
Item NameInsert,screw Thread
FSC / FSG5325 — No Item Name Available (FSG 53)
ManufacturersGeneral Electric Company Dba Ge Structured Services Div General Electric Structured Services, Lp (CAGE 03350); The Boeing Company Div Defense (CAGE 81205); Donaldson Company, Inc. (CAGE 13520); Zf Industrieantriebe Witten Gmbh (CAGE D9182); Allison Transmission Inc Dba Allison Transmission, Inc (CAGE 73342)
Technical Specifications
ParameterValue
NSN5325-00-721-7498
Primary Part NumberMS21209F4-20
Item NameInsert,screw Thread
FSC / FSG5325 / 53 — No Item Name Available
ManufacturerNational Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
⇄ Verified Substitutes 7
4240-00-300-8413S9300-921871PC106 INTERCHANGEABLE
Clamp,breathing Tub
Naval Ship Systems Command
5365-00-721-552869824-6 INTERCHANGEABLE
Ring,lock,keyed
Ontic Engineering & Manufacturing, Inc Dba Ontic Us
5120-01-121-5019 INTERCHANGEABLE
Tapping Tool,screwdriver Handle
5325-01-144-26653591-4CN 0.500 INTERCHANGEABLE
Insert,screw Thread
New Haven Mfg Corp Stromberg Products Div P O Box 559 Naugatuck Ct 06770-0559
3130-01-308-01486519500 INTERCHANGEABLE
Bearing Unit,ball
Alfa Laval Inc
5340-01-424-63246259088 INTERCHANGEABLE
Cover,access
Naval Sea Systems Command
5136-01-473-9637 INTERCHANGEABLE
Tapping Tool,screwdriver Handle
Cross-Reference Index
Part NumberManufacturer
3591-4CNX0500 General Electric Company Dba Ge Structured Services Div General Electric Structured Services, Lp (USA)
BACS13W4CN4 The Boeing Company Div Defense (USA)
428961 ITEM 16 Donaldson Company, Inc. (USA)
6259088 Zf Industrieantriebe Witten Gmbh (DEU)
6519500 Allison Transmission Inc Dba Allison Transmission, Inc (USA)
MS21209F4-20 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
3591-4CN500 New Haven Mfg Corp (USA)
3591-4CN0500 Stanley Engineered Fastening Llc (USA)
3591-4CNX500 Turbo Power & Marine System Inc Sub of United Technologies Corp (USA)
62720 Hamilton Sundstrand Corporation (USA)
839232-00 Defense Reduction Agency (USA)
NAS1222-4E National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
MS21209F4-20 PRIMARY National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
NASM21209 National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
112262-1 Solar Turbines Incorporated Dba Solar Turbines Incorporated (USA)
3591-4CNX500 Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA)
431384 ITEM 26 Donaldson Company, Inc. (USA)
10062716 Nimikkeistokeskus Ncb Finland (FIN)
3591-4CN.500 Stanley Engineered Fastening Llc (USA)
209F4-0500 Albany Fasteners Pawtucket Fasteners Div (USA)
Related Parts
4240-00-300-8413INTERCHANGEABLE
CLAMP,BREATHING TUB
S9300-921871PC106
5365-00-721-5528INTERCHANGEABLE
RING,LOCK,KEYED
69824-6
5120-01-121-5019INTERCHANGEABLE
TAPPING TOOL,SCREWDRIVER HANDLE
5325-01-144-2665INTERCHANGEABLE
INSERT,SCREW THREAD
3591-4CN 0.500
3130-01-308-0148INTERCHANGEABLE
BEARING UNIT,BALL
6519500
5340-01-424-6324INTERCHANGEABLE
COVER,ACCESS
6259088
5136-01-473-9637INTERCHANGEABLE
TAPPING TOOL,SCREWDRIVER HANDLE

Frequently Asked Questions

What is NSN 5325-00-721-7498?

NSN 5325-00-721-7498 is a Insert,screw Thread, manufactured by National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use, classified under FSC 5325 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5325-00-721-7498?

NSN 5325-00-721-7498 has 38 cross-referenced part numbers: 3591-4CNX0500 (General Electric Company Dba Ge Structured Services Div General Electric Structured Services, Lp), BACS13W4CN4 (The Boeing Company Div Defense), 428961 ITEM 16 (Donaldson Company, Inc.), 6259088 (Zf Industrieantriebe Witten Gmbh), 6519500 (Allison Transmission Inc Dba Allison Transmission, Inc) and 33 more.

What NSN replaces 5325-00-721-7498?

There are 7 known substitutes for 5325-00-721-7498: 4240-00-300-8413, 5365-00-721-5528, 5120-01-121-5019 and 4 more. Verify interchangeability with system specifications before substitution.

Is NSN 5325-00-721-7498 still in active supply?

NSN 5325-00-721-7498 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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