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Technical Data Sheet
PartsTable / COMPONENT / 51-102656
51-102656 ✓ 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 PACKING NUT is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 937, slot_width: 1.537 INCHES NOMINAL IN, thread_size: 5-7/8IN-12 IN, thread_class: 2A A, thread_length: 0.56875 INCHES NOMINAL IN, overall_length: 1.250 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-595-2220, 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
51-102656
NSN: 4730-00-595-2220
FSC: 4730
CAGE: 55683 — WHEELER FLEET SOLUTIONS, CO. (USA)
SPECIFICATIONS
materialCOPPER ALLOY 937
slot_width1.537 INCHES NOMINAL IN
thread_size5-7/8IN-12 IN
thread_class2A A
thread_length0.56875 INCHES NOMINAL IN
overall_length1.250 INCHES NOMINAL IN
style_designatorROUND, EXTERNAL THREAD, INVERTED FLARE
thread_directionRIGHT-HAND
seat_angle_in_deg30.0
length_to_shoulder0.750 INCHES NOMINAL IN
hole_or_slot_quantity6
screw_thread_locationEXTERNAL
NSN4730-00-595-2220
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 51-102656 · 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
•
UNTHREADED PORTION LENGTH: 0.125 INCHES NOMINAL IN
•
MAJOR UNTHREADED OUTSIDE DIAMETER: 6.125 INCHES NOMINAL IN
•
LENGTH TO SHOULDER: 0.750 INCHES NOMINAL IN
•
SCREW THREAD LOCATION: EXTERNAL
•
SMALLEST INSIDE DIAMETER: 4.941 INCHES MINIMUM AND 4.944 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: ROUND, EXTERNAL THREAD, INVERTED FLARE
•
MATERIAL: COPPER ALLOY 937
TECHNICAL CHARACTERISTICS (FLIS)
UNTHREADED PORTION LENGTH0.125 INCHES NOMINAL IN
MAJOR UNTHREADED OUTSIDE DIAMETER6.125 INCHES NOMINAL IN
LENGTH TO SHOULDER0.750 INCHES NOMINAL IN
SCREW THREAD LOCATIONEXTERNAL
SMALLEST INSIDE DIAMETER4.941 INCHES MINIMUM AND 4.944 INCHES MAXIMUM IN
STYLE DESIGNATORROUND, EXTERNAL THREAD, INVERTED FLARE
MATERIALCOPPER ALLOY 937
OVERALL LENGTH1.250 INCHES NOMINAL IN
THREAD LENGTH0.56875 INCHES NOMINAL IN
SLOT WIDTH1.537 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
102656Interchangeable
interchangeable cross-reference
interchangeable
D4524-5557-1Interchangeable
interchangeable cross-reference
interchangeable
G25P7468Interchangeable
interchangeable cross-reference
interchangeable
373MS023P001Interchangeable
interchangeable cross-reference
interchangeable
695435-6Interchangeable
interchangeable cross-reference
interchangeable
20015-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 51-102656?
51-102656 is a PACKING NUT.
What parts can replace 51-102656?
There are 7 known substitutes for 51-102656: 102656, D4524-5557-1, G25P7468 and 4 more. Substitute compatibility should be verified for your specific system.
Is 51-102656 still available?
51-102656 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026