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M18180/2-56A01A — Technical Data Sheet

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— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The FLANGE,PIPE is a the manufacturer industrial component. Key specifications include material: STEEL, thickness: 0.875 INCHES NOMINAL IN, neck_height: 0.375 INCHES NOMINAL IN, socket_depth: 0.625 INCHES NOMINAL IN, flange_diameter: 6.125 INCHES NOMINAL IN, socket_diameter: 1.950 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-181-3620, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
M18180/2-56A01A
NSN: 4730-01-181-3620
FSC: 4730
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL
thickness0.875 INCHES NOMINAL IN
neck_height0.375 INCHES NOMINAL IN
socket_depth0.625 INCHES NOMINAL IN
flange_diameter6.125 INCHES NOMINAL IN
socket_diameter1.950 INCHES NOMINAL IN
style_designatorROUND, ONE BOLT HOLE CIRCLE
bolt_hole_diameter0.750 INCHES NOMINAL IN
bolt_hole_quantity4
raised_face_height0.250 INCHES NOMINAL IN
bolt_circle_diameter4.500 INCHES NOMINAL IN
flange_section_styleRAISED FACE, SOCKET NECK
NSN4730-01-181-3620
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: M18180/2-56A01A · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
RAISED FACE HEIGHT: 0.250 INCHES NOMINAL IN
•
SOCKET DIAMETER: 1.950 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 4
•
STYLE DESIGNATOR: ROUND, ONE BOLT HOLE CIRCLE
•
SPECIFICATION/STANDARD DATA: 81349-MIL-F-18180 GOVERNMENT SPECIFICATION
•
MAXIMUM OPERATING TEMP AND MEDIA FOR WHICH DESIGNED: 850.0 FAHRENHEIT ANY ACCEPTABLE DEGF
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM,A-105,GR 2 ASSN STD SINGLE MATERIAL RESPONSE
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS (FLIS)
RAISED FACE HEIGHT0.250 INCHES NOMINAL IN
SOCKET DIAMETER1.950 INCHES NOMINAL IN
BOLT HOLE QUANTITY4
STYLE DESIGNATORROUND, ONE BOLT HOLE CIRCLE
SPECIFICATION/STANDARD DATA81349-MIL-F-18180 GOVERNMENT SPECIFICATION
MAXIMUM OPERATING TEMP AND MEDIA FOR WHICH DESIGNED850.0 FAHRENHEIT ANY ACCEPTABLE DEGF
MATERIAL DOCUMENT AND CLASSIFICATIONASTM,A-105,GR 2 ASSN STD SINGLE MATERIAL RESPONSE
MATERIALSTEEL
BOLT HOLE DIAMETER0.750 INCHES NOMINAL IN
FACE SEATING SURFACE CONDITIONMACHINED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
B16-5-1953TABLE21Interchangeable
interchangeable cross-reference
interchangeable
ASME B16.5Interchangeable
interchangeable cross-reference
interchangeable
B16-5-1-1-4IN-IPS150PSI-PP-FLGEInterchangeable
interchangeable cross-reference
interchangeable
20-1-1/4Interchangeable
interchangeable cross-reference
interchangeable
MIL-F-18180/2Interchangeable
interchangeable cross-reference
interchangeable
M18180/2-02A01HInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M18180/2-56A01A?
M18180/2-56A01A is a FLANGE,PIPE.
What parts can replace M18180/2-56A01A?
There are 10 known substitutes for M18180/2-56A01A: B16-5-1953TABLE21, ASME B16.5, B16-5-1-1-4IN-IPS150PSI-PP-FLGE and 7 more. Substitute compatibility should be verified for your specific system.
Is M18180/2-56A01A still available?
M18180/2-56A01A is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026