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Technical Data Sheet
PartsTable / COMPONENT / FIT-221-3/8
FIT-221-3/8 ✓ Verified by PartsTable
— · PIPE SECTION
WHAT YOU NEED TO KNOW
Schedule = wall thickness, NOT diameter Nominal pipe size != actual OD
Sch 40 and Sch 80 same OD, different wall
PRODUCT OVERVIEW

The FIT-221-3/8 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-01-247-3213, 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
FIT-221-3/8
NSN: 4720-01-247-3213
FSC: 4720
CAGE: 92194 — BELDEN, INC. (USA)
SPECIFICATIONS
Part NumberFIT-221-3/8
NSN4720-01-247-3213
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: FIT-221-3/8 · OEM ⚠ VERIFY BEFORE ORDERING Schedule = wall thickness, NOT pipe diameter. Sch 40 and Sch 80 have the same OD but different wall thickness. Nominal pipe size ≠ actual OD — a 1" pipe is actually 1.315" OD ✓ BROKER TIP Sch 40 = standard wall, Sch 80 = heavy wall (higher pressure), Sch 160 = extra heavy. Seamless pipe is required for high-pressure applications — welded pipe has lower ratings PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OUTSIDE DIAMETER: 0.425 INCHES NOMINAL IN
•
INSIDE DIAMETER: 0.375 INCHES NOMINAL IN
•
MINIMUM TENSILE STRENGTH: 2500 POUNDS PER SQUARE INCH LBS
•
TEMP RATING: -55.0 CELSIUS AND 135.0 CELSIUS SINGLE RESPONSE DEGC
•
INSIDE SURFACE CONDITION: SMOOTH
•
MATERIAL: PLASTIC POLYTETRAFLUOROETHYLENE TUBE
•
FLEXIBILITY: FLEXIBLE
•
CROSS-SECTIONAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER0.425 INCHES NOMINAL IN
INSIDE DIAMETER0.375 INCHES NOMINAL IN
MINIMUM TENSILE STRENGTH2500 POUNDS PER SQUARE INCH LBS
TEMP RATING-55.0 CELSIUS AND 135.0 CELSIUS SINGLE RESPONSE DEGC
INSIDE SURFACE CONDITIONSMOOTH
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE TUBE
FLEXIBILITYFLEXIBLE
CROSS-SECTIONAL SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
MIL-I-23053/5Interchangeable
interchangeable cross-reference
interchangeable
CLASS2Interchangeable
interchangeable cross-reference
interchangeable
FIT-221 3/8Interchangeable
interchangeable cross-reference
interchangeable
FIT221 3-8Interchangeable
interchangeable cross-reference
interchangeable
700058-187CInterchangeable
Same NIIN cross-reference
interchangeable
FIT-221-3/8"Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is FIT-221-3/8?
FIT-221-3/8 is a FIT-221-3/8.
What parts can replace FIT-221-3/8?
There are 6 known substitutes for FIT-221-3/8: MIL-I-23053/5, CLASS2, FIT-221 3/8 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for FIT-221-3/8?
FIT-221-3/8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-01-247-3213. 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