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C20657 ✓ 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 COMPLETE END FITTING, point_type: CONVENTIONAL, point_angle: 118.0 DEGREES NOMINAL, shank_style: STRAIGHT ROUND, flute_length: 0.875 INCHES NOMINAL IN, overall_length: 1.875 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 4730-01-517-1492, 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
C20657
NSN: 4730-01-517-1492
FSC: 4730
CAGE: 32142 — HYDRASEARCH COMPANY, LLC (USA)
SPECIFICATIONS
materialCOPPER AND ZINC COMPLETE END FITTING
point_typeCONVENTIONAL
point_angle118.0 DEGREES NOMINAL
shank_styleSTRAIGHT ROUND
flute_length0.875 INCHES NOMINAL IN
flute_quantity2
overall_length1.875 INCHES NOMINAL IN
shank_diameter0.052 INCHES NOMINAL IN
cutting_end_styleGENERAL PURPOSE
end_item_identification3895-01-669-1345
nominal_cutting_diameter0.0520 INCHES IN
cutting_rotation_directionRIGHT-HAND
NSN4730-01-517-1492
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: C20657 · 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 9
20-657Interchangeable
interchangeable cross-reference
interchangeable
1340Interchangeable
interchangeable cross-reference
interchangeable
GGG-D-751 TYCSZ55Interchangeable
interchangeable cross-reference
interchangeable
208Interchangeable
interchangeable cross-reference
interchangeable
54A50C105-2Interchangeable
interchangeable cross-reference
interchangeable
0020650730Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C20657?
C20657 is a COUPLING,HOSE.
What parts can replace C20657?
There are 9 known substitutes for C20657: 20-657, 1340, GGG-D-751 TYCSZ55 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for C20657?
C20657 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-517-1492. 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