PartsTable
Technical Data Sheet
PartsTable / COMPONENT / C51-3-25
C51-3-25 ✓ 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 RESTRICTOR,FLUID FLOW is a the manufacturer industrial component. Key specifications include length: 2.000 INCHES NOMINAL IN, material: COPPER ALLOY, design_type: TUBULAR, thread_class: 2A LOCATION NOT OTHERWISE SPECIFIED A, thread_length: 0.219 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN, thread_series: UNF LOCATION NOT OTHERWISE SPECIFIED. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-496-0020, 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
C51-3-25
NSN: 4730-00-496-0020
FSC: 4730
CAGE: 79960 — ZENITH FUEL SYSTEMS LLC (USA)
SPECIFICATIONS
length2.000 INCHES NOMINAL IN
materialCOPPER ALLOY
design_typeTUBULAR
thread_class2A LOCATION NOT OTHERWISE SPECIFIED A
thread_length0.219 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
thread_seriesUNF LOCATION NOT OTHERWISE SPECIFIED
orifice_diameter0.045 INCHES NOMINAL IN
outside_diameter0.152 INCHES NOMINAL IN
thread_directionRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
thread_provisionTHREADED LOCATION NOT OTHERWISE SPECIFIED
thread_size_designator5/16-24 LOCATION NOT OTHERWISE SPECIFIED
NSN4730-00-496-0020
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: C51-3-25 · 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
•
THREAD SIZE DESIGNATOR: 5/16-24 LOCATION NOT OTHERWISE SPECIFIED
•
ORIFICE DIAMETER: 0.045 INCHES NOMINAL IN
•
THREAD CLASS: 2A LOCATION NOT OTHERWISE SPECIFIED A
•
THREAD DIRECTION: RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
•
LENGTH: 2.000 INCHES NOMINAL IN
•
THREAD LENGTH: 0.219 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
•
THREAD PROVISION: THREADED LOCATION NOT OTHERWISE SPECIFIED
•
OUTSIDE DIAMETER: 0.152 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SIZE DESIGNATOR5/16-24 LOCATION NOT OTHERWISE SPECIFIED
ORIFICE DIAMETER0.045 INCHES NOMINAL IN
THREAD CLASS2A LOCATION NOT OTHERWISE SPECIFIED A
THREAD DIRECTIONRIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED
LENGTH2.000 INCHES NOMINAL IN
THREAD LENGTH0.219 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
THREAD PROVISIONTHREADED LOCATION NOT OTHERWISE SPECIFIED
OUTSIDE DIAMETER0.152 INCHES NOMINAL IN
DESIGN TYPETUBULAR
MATERIALCOPPER ALLOY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
C-7703-BInterchangeable
interchangeable cross-reference
interchangeable
1125-2Interchangeable
interchangeable cross-reference
interchangeable
10177145-003Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy C51-3-25?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is C51-3-25?
C51-3-25 is a RESTRICTOR,FLUID FLOW.
What parts can replace C51-3-25?
There are 3 known substitutes for C51-3-25: C-7703-B, 1125-2, 10177145-003. Substitute compatibility should be verified for your specific system.
Is C51-3-25 still available?
C51-3-25 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — C51-3-25

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026