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MS18308 ✓ Verified by PartsTable
— · 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: 0.562 INCHES NOMINAL IN, neck_height: 0.500 INCHES NOMINAL IN, socket_depth: 0.375 INCHES NOMINAL IN, flange_diameter: 3.750 INCHES NOMINAL IN, socket_diameter: 0.690 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-174-5937, 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
MS18308
NSN: 4730-00-174-5937
FSC: 4730
CAGE: 96906 — MILITARY STANDARDS PROMULGATED BY MILITARY DEPARTMENTS UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialSTEEL
thickness0.562 INCHES NOMINAL IN
neck_height0.500 INCHES NOMINAL IN
socket_depth0.375 INCHES NOMINAL IN
flange_diameter3.750 INCHES NOMINAL IN
socket_diameter0.690 INCHES NOMINAL IN
style_designatorROUND, ONE BOLT HOLE CIRCLE
bolt_hole_diameter0.562 INCHES NOMINAL IN
bolt_hole_quantity4
raised_face_height0.250 INCHES NOMINAL IN
bolt_circle_diameter2.625 INCHES NOMINAL IN
flange_section_styleRAISED FACE, SOCKET NECK
NSN4730-00-174-5937
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MS18308 · 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
•
FACE SEATING SURFACE CONDITION: SERRATED
•
BOLT HOLE DIAMETER: 0.562 INCHES NOMINAL IN
•
RAISED FACE DIAMETER: 1.625 INCHES NOMINAL IN
•
FLANGE SECTION STYLE: RAISED FACE, SOCKET NECK
•
NOMINAL PIPE SIZE FOR WHICH DESIGNED: 0.250 INCHES IN
•
NECK HEIGHT: 0.500 INCHES NOMINAL IN
•
RAISED FACE HEIGHT: 0.250 INCHES NOMINAL IN
•
BOLT HOLE QUANTITY: 4
TECHNICAL CHARACTERISTICS (FLIS)
FACE SEATING SURFACE CONDITIONSERRATED
BOLT HOLE DIAMETER0.562 INCHES NOMINAL IN
RAISED FACE DIAMETER1.625 INCHES NOMINAL IN
FLANGE SECTION STYLERAISED FACE, SOCKET NECK
NOMINAL PIPE SIZE FOR WHICH DESIGNED0.250 INCHES IN
NECK HEIGHT0.500 INCHES NOMINAL IN
RAISED FACE HEIGHT0.250 INCHES NOMINAL IN
BOLT HOLE QUANTITY4
SOCKET DIAMETER0.555 INCHES NOMINAL IN
MAXIMUM OPERATING TEMP AND MEDIA FOR WHICH DESIGNED850.0 FAHRENHEIT STEAM AND 425.0 FAHRENHEIT WATER DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
MS18308-3/8INCHInterchangeable
interchangeable cross-reference
interchangeable
MS18308Interchangeable
interchangeable cross-reference
interchangeable
5000S4823-64496Interchangeable
interchangeable cross-reference
interchangeable
MS18308-1/4Interchangeable
Same NIIN cross-reference
interchangeable
MS18308-1/4INCHInterchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MS18308?
MS18308 is a FLANGE,PIPE.
What parts can replace MS18308?
There are 5 known substitutes for MS18308: MS18308-3/8INCH, MS18308, 5000S4823-64496 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MS18308?
MS18308 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-174-5937. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026