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CH551 ✓ Verified by PartsTable
— · PIPE SECTION
WHAT YOU NEED TO KNOW
Schedule = wall thickness, NOT diameter Nominal pipe size != actual OD
Sch 40 and Sch 80 same OD, different wall
PRODUCT OVERVIEW

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: ALUMINUM BODY, unit_type: GASKET, body_width: 1.094 INCHES NOMINAL IN, shell_type: SOLID, body_length: 0.640 INCHES MAXIMUM IN, flange_depth: 0.280 INCHES MINIMUM AND 0.340 INCHES MAXIMUM SECOND FLANGE 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 4720-00-419-9381, 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
CH551
NSN: 4720-00-419-9381
FSC: 4720
CAGE: 24161 — GATES CORPORATION (USA)
SPECIFICATIONS
materialALUMINUM BODY
unit_typeGASKET
body_width1.094 INCHES NOMINAL IN
shell_typeSOLID
body_length0.640 INCHES MAXIMUM IN
flange_depth0.280 INCHES MINIMUM AND 0.340 INCHES MAXIMUM SECOND FLANGE IN
flange_styleCONTACT TYPE FIRST FLANGE
specific_useENGINE AIR INLET
thread_class2A ALL ENDS A
adapter_length2.282 INCHES MINIMUM AND 2.302 INCHES MAXIMUM IN
inclosure_typeHERMETICALLY SEALED
overall_length60.000 INCHES NOMINAL IN
NSN4720-00-419-9381
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: CH551 · OEM ⚠ VERIFY BEFORE ORDERING Schedule = wall thickness, NOT pipe diameter. Sch 40 and Sch 80 have the same OD but different wall thickness. Nominal pipe size ≠ actual OD — a 1" pipe is actually 1.315" OD ✓ BROKER TIP Sch 40 = standard wall, Sch 80 = heavy wall (higher pressure), Sch 160 = extra heavy. Seamless pipe is required for high-pressure applications — welded pipe has lower ratings PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
20551Interchangeable
interchangeable cross-reference
interchangeable
900262-45Interchangeable
interchangeable cross-reference
interchangeable
5813709-503Interchangeable
interchangeable cross-reference
interchangeable
AN3102A12S3PInterchangeable
interchangeable cross-reference
interchangeable
S24-2420Interchangeable
interchangeable cross-reference
interchangeable
31Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is CH551?
CH551 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace CH551?
There are 10 known substitutes for CH551: 20551, 900262-45, 5813709-503 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for CH551?
CH551 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-419-9381. 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