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PartsTable / COMPONENT / C20638
C20638 ✓ 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 COUPLING,HOSE is a the manufacturer industrial component. Key specifications include material: COPPER AND ZINC BODY, hole_size: 0.328 IN. MIN,0.385 IN.

MAX DIA IN, point_type: CONVENTIONAL, cooling_fin: NOT INCLUDED, point_angle: 118.0 DEGREES NOMINAL, shank_style: STRAIGHT ROUND. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-517-1508, 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
C20638
NSN: 4730-01-517-1508
FSC: 4730
CAGE: 32142 — HYDRASEARCH COMPANY, LLC (USA)
SPECIFICATIONS
materialCOPPER AND ZINC BODY
hole_size0.328 IN. MIN,0.385 IN. MAX DIA IN
point_typeCONVENTIONAL
cooling_finNOT INCLUDED
point_angle118.0 DEGREES NOMINAL
shank_styleSTRAIGHT ROUND
flute_length3.625 INCHES NOMINAL IN
hole_spacingSPACED BETWEEN MTG HOLES ON 5.496 IN. MIN.,5.504 IN. MAX DIA BOLT CIRCLE,2 HOLES SPACED 72 DEG APART,144 DEG EAC FROM 3RD HOLE IN
balancing_padNOT INCLUDED
overall_width0.215 INCHES NOMINAL IN
flute_quantity2
oil_drain_holeNOT INCLUDED
NSN4730-01-517-1508
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: C20638 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
R10Interchangeable
interchangeable cross-reference
interchangeable
10024Interchangeable
interchangeable cross-reference
interchangeable
405Interchangeable
interchangeable cross-reference
interchangeable
150 74Interchangeable
interchangeable cross-reference
interchangeable
44144Interchangeable
interchangeable cross-reference
interchangeable
B94.11MInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C20638?
C20638 is a COUPLING,HOSE.
What parts can replace C20638?
There are 14 known substitutes for C20638: R10, 10024, 405 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for C20638?
C20638 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-517-1508. 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