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1P3551 ✓ 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 CHUCK,AIR,INFLATING is a the manufacturer industrial component. Key specifications include material: STEEL INNER RING, body_width: 1.750 INCHES NOMINAL IN, bore_shape: STRAIGHT, shaft_type: ROUND SINGLE ACTUATOR, body_height: 0.790 INCHES NOMINAL IN, body_length: 3.750 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 4730-01-185-4086, 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
1P3551
NSN: 4730-01-185-4086
FSC: 4730
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL INNER RING
body_width1.750 INCHES NOMINAL IN
bore_shapeSTRAIGHT
shaft_typeROUND SINGLE ACTUATOR
body_height0.790 INCHES NOMINAL IN
body_length3.750 INCHES NOMINAL IN
constructionSLOT WOUND
shaft_length0.750 INCHES NOMINAL SINGLE ACTUATOR IN
thread_class2B SINGLE MOUNTING FACILITY
bore_diameter8.00 MILLIMETERS NOMINAL MM
overall_width3.340 INCHES MAXIMUM IN
pole_quantity4 EACH SECTION PERIPHERY
NSN4730-01-185-4086
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1P3551 · 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 5
427198Interchangeable
interchangeable cross-reference
interchangeable
H-4660-OPInterchangeable
interchangeable cross-reference
interchangeable
4660AInterchangeable
interchangeable cross-reference
interchangeable
9038Interchangeable
interchangeable cross-reference
interchangeable
5R5806Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1P3551?
1P3551 is a CHUCK,AIR,INFLATING.
What parts can replace 1P3551?
There are 5 known substitutes for 1P3551: 427198, H-4660-OP, 4660A and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1P3551?
1P3551 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-185-4086. 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