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PartsTable / COMPONENT / CH1291
CH1291 ✓ 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

The TRANSFORMER,AUDIO FREQUENCY is a the manufacturer industrial component. Key specifications include inside_diameter: 2.500 INCHES NOMINAL IN, style_designator: TWO BEND, features_provided: ENLARGED ENDS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-01-263-6520, 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
CH1291
NSN: 4720-01-263-6520
FSC: 4720
CAGE: 24161 — GATES CORPORATION (USA)
SPECIFICATIONS
inside_diameter2.500 INCHES NOMINAL IN
style_designatorTWO BEND
features_providedENLARGED ENDS
end_item_identificationNAVISTAR S SERIES TRUCKS MODEL 1626,1654,1723,1724,1734,1754,1823,1824,1853,1824-4X4,1854,1954,1925,1955,1954-6X6,1955,2125,2155,F2125,F1954,F1924-6X6,1753
NSN4720-01-263-6520
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: CH1291 · 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
KEY FEATURES
•
INSIDE DIAMETER: 2.500 INCHES NOMINAL IN
•
FEATURES PROVIDED: ENLARGED ENDS
•
STYLE DESIGNATOR: TWO BEND
TECHNICAL CHARACTERISTICS (FLIS)
END ITEM IDENTIFICATIONNAVISTAR S SERIES TRUCKS MODEL 1626,1654,1723,1724,1734,1754,1823,1824,1853,1824-4X4,1854,1954,1925,1955,1954-6X6,1955,2125,2155,F2125,F1954,F1924-6X6,1753
INSIDE DIAMETER2.500 INCHES NOMINAL IN
FEATURES PROVIDEDENLARGED ENDS
STYLE DESIGNATORTWO BEND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
297BCInterchangeable
interchangeable cross-reference
interchangeable
21-291Interchangeable
interchangeable cross-reference
interchangeable
61-128Interchangeable
interchangeable cross-reference
interchangeable
B107.39Interchangeable
interchangeable cross-reference
interchangeable
839539Interchangeable
interchangeable cross-reference
interchangeable
116185Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is CH1291?
CH1291 is a TRANSFORMER,AUDIO FREQUENCY.
What parts can replace CH1291?
There are 21 known substitutes for CH1291: 297BC, 21-291, 61-128 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for CH1291?
CH1291 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-01-263-6520. 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