PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 1540-20
1540-20 ✓ 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

HEATING ELEMENT,ELECTRICAL,NONIM. Key specifications include material: RUBBER OVERALL, construction: SOLIDSOLID, aperture_width: 3.000 INCHES NOMINAL3.000 INCHES NOMINAL IN, aperture_length: 14.250 INCHES NOMINAL14.250 INCHES NOMINAL IN, attachment_method: ROUND HOLEROUND HOLE, fabrication_method: SOLIDSOLID. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-540-1979, 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
1540-20
NSN: 4720-00-540-1979
FSC: 4720
CAGE: 01276 — DANFOSS POWER SOLUTIONS II, LLC (USA)
SPECIFICATIONS
materialRUBBER OVERALL
constructionSOLIDSOLID
aperture_width3.000 INCHES NOMINAL3.000 INCHES NOMINAL IN
aperture_length14.250 INCHES NOMINAL14.250 INCHES NOMINAL IN
attachment_methodROUND HOLEROUND HOLE
fabrication_methodSOLIDSOLID
cross-sectional_width0.750 INCHES NOMINAL0.750 INCHES NOMINAL IN
cross-sectional_height0.375 INCHES NOMINAL0.375 INCHES NOMINAL IN
attachment_hole_diameter0.343 INCHES NOMINAL0.343 INCHES NOMINAL IN
attachment_feature_quantity55
NSN4720-00-540-1979
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 1540-20 · 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
•
LAYER COMPOSITION AND LOCATION: 1ST LAYER BRAIDED STEEL WIRE AND OUTER LAYER RUBBER IMPREGNATED BRAIDED FABRIC
•
EXTERIOR COLOR: RED
•
MATERIAL: RUBBER SYNTHETIC TUBE
•
HYDROSTATIC TEST PRESSURE: 700.0 POUNDS PER SQUARE INCH SINGLE RESPONSE LBS
•
NONDEFINITIVE SPEC/STD DATA: 20 SIZE
•
INSIDE SURFACE CONDITION: SMOOTH
•
SPECIFICATION/STANDARD DATA: 81343-SAE J51,TYPE B PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
VACUUM IN TORR: 50.8
TECHNICAL CHARACTERISTICS (FLIS)
LAYER COMPOSITION AND LOCATION1ST LAYER BRAIDED STEEL WIRE AND OUTER LAYER RUBBER IMPREGNATED BRAIDED FABRIC
EXTERIOR COLORRED
MATERIALRUBBER SYNTHETIC TUBE
HYDROSTATIC TEST PRESSURE700.0 POUNDS PER SQUARE INCH SINGLE RESPONSE LBS
NONDEFINITIVE SPEC/STD DATA20 SIZE
INSIDE SURFACE CONDITIONSMOOTH
SPECIFICATION/STANDARD DATA81343-SAE J51,TYPE B PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
VACUUM IN TORR50.8
OUTER COVERING ENVIRONMENTAL PROTECTIONOIL RESISTANT
OPERATING PRESSURE350.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
25820Interchangeable
interchangeable cross-reference
interchangeable
560954R1Interchangeable
interchangeable cross-reference
interchangeable
208Interchangeable
interchangeable cross-reference
interchangeable
503-S 33Interchangeable
interchangeable cross-reference
interchangeable
350-RTInterchangeable
interchangeable cross-reference
interchangeable
24120Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1540-20?
1540-20 is a HEATING ELEMENT,ELECTRICAL,NONIM.
What parts can replace 1540-20?
There are 18 known substitutes for 1540-20: 25820, 560954R1, 208 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1540-20?
1540-20 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-540-1979. 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