PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

1577ALBreather

Emcor Enclosures Llc · NSN 2520-00-113-5509 · FSC 2520 · No Item Name Available
Verified by PartsTable
NSN 2520-00-113-5509 — this item is cataloged by the U.S. Government under National Stock Number 2520-00-113-5509. Primary manufacturer part number: 1577AL.
Features
  • Breather — FSC 2520
  • Outside Diameter: 1.531 INCHES MAXIMUM IN
  • Connection Type: THREADED
  • Supplementary Features: PLATING: CADMIUM TYPE II,CLASS 3, SPEC QQ-P-416 (ON STEEL PARTS)
  • Body Material: ALUMINUM AND STEEL
  • Thread Size and Series/type Designator: 1/4-18 NPT
  • 5 verified cross-references
  • Primary manufacturer: Emcor Enclosures Llc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Breather, cataloged under National Stock Number 2520-00-113-5509, is classified within Federal Supply Class 2520 (No Item Name Available) of the Vehicular Equipment Components group. The primary manufacturer of record is Emcor Enclosures Llc. Government technical data includes 5 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN2520-00-113-5509
Primary Part Number1577AL
Item NameBreather
FSC / FSG2520 / 25 — No Item Name Available
ManufacturerEmcor Enclosures Llc
StatusCANCELLED
Outside Diameter1.531 INCHES MAXIMUM IN
Connection TypeTHREADED
Supplementary FeaturesPLATING: CADMIUM TYPE II,CLASS 3, SPEC QQ-P-416 (ON STEEL PARTS)
Body MaterialALUMINUM AND STEEL
Thread Size and Series/type Designator1/4-18 NPT
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
3455-00-228-5218171621 INTERCHANGEABLE
Cutter,milling,end
New York Twist Drill Inc
3455-00-335-3043 INTERCHANGEABLE
Blade,hole Saw
2920-00-355-9929 INTERCHANGEABLE
Suppressor,ignition Interference
5120-00-877-4314S22 INTERCHANGEABLE
Die,coaxial
Souriau Usa, Inc. Dba Souriau Usa Inc
8030-00-889-353511072502 INTERCHANGEABLE
Tape,antiseizing
Us Army Aviation and Missile Command
2940-00-892-2984140-0495 INTERCHANGEABLE
Filter Element,intake Air Cleane
Cummins Power Generation Inc.
5340-01-023-631301007LA INTERCHANGEABLE
Key Blank
Ilco Unican Corp Dba Wolf Sales
4510-01-027-4739 INTERCHANGEABLE
Valve,float,water Closet Tank
5220-01-045-6885 INTERCHANGEABLE
Gage,profile
5330-01-174-8263 INTERCHANGEABLE
Gasket
Cross-Reference Index
Part NumberManufacturer
S22 Portec Inc Pioneer Div (USA)
11602562 U S Army Tank Automotive Command Amsta-Im-Mm (USA)
PA675 Portec Inc Pioneer Div (USA)
4H6112 Caterpillar Inc Div Caterpillar Defense (USA)
1577AL PRIMARY Emcor Enclosures Llc (USA)
Related Parts
3455-00-228-5218INTERCHANGEABLE
CUTTER,MILLING,END
171621
3455-00-335-3043INTERCHANGEABLE
BLADE,HOLE SAW
2920-00-355-9929INTERCHANGEABLE
SUPPRESSOR,IGNITION INTERFERENCE
5120-00-877-4314INTERCHANGEABLE
DIE,COAXIAL
S22
8030-00-889-3535INTERCHANGEABLE
TAPE,ANTISEIZING
11072502
2940-00-892-2984INTERCHANGEABLE
FILTER ELEMENT,INTAKE AIR CLEANE
140-0495
5340-01-023-6313INTERCHANGEABLE
KEY BLANK
01007LA
4510-01-027-4739INTERCHANGEABLE
VALVE,FLOAT,WATER CLOSET TANK
5220-01-045-6885INTERCHANGEABLE
GAGE,PROFILE
5330-01-174-8263INTERCHANGEABLE
GASKET
4820-01-214-6891INTERCHANGEABLE
VALVE,CHECK
6515-01-347-4886INTERCHANGEABLE
STRAP,THIGH

Frequently Asked Questions

What is NSN 2520-00-113-5509?

NSN 2520-00-113-5509 is a Breather, manufactured by Emcor Enclosures Llc, classified under FSC 2520 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 2520-00-113-5509?

NSN 2520-00-113-5509 has 5 cross-referenced part numbers: S22 (Portec Inc Pioneer Div), 11602562 (U S Army Tank Automotive Command Amsta-Im-Mm), PA675 (Portec Inc Pioneer Div), 4H6112 (Caterpillar Inc Div Caterpillar Defense), 1577AL (Emcor Enclosures Llc).

What NSN replaces 2520-00-113-5509?

There are 12 known substitutes for 2520-00-113-5509: 3455-00-228-5218, 3455-00-335-3043, 2920-00-355-9929 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 1577AL?

Key specifications for 1577AL: Outside Diameter: 1.531 INCHES MAXIMUM IN; Connection Type: THREADED; Special Features: STEEL CAP,THRU PASSAGE BOLT AND RETAINER;ALUMINUM WOOL FILTER MATERIAL;0.625 IN.ACROSS HEX WRENCHING FLATS IN; Part Name Assigned by Controlling Agency: BREATHER. 9 total characteristics are documented in the Federal Logistics Information System.

Is NSN 2520-00-113-5509 still in active supply?

NSN 2520-00-113-5509 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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