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PartsTable / COMPONENT / ER121
ER121 ✓ 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 RELAY,ELECTROMAGNETIC is a the manufacturer industrial component. Key specifications include material: PLASTIC CASE, duty_type: CONTINUOUS, design_form: PREBENT, storage_type: GENERAL PURPOSE WAREHOUSE, cubic_measure: 9.844 CUBIC INCHES, overall_width: 1.250 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 4710-00-603-1338, 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
ER121
NSN: 4710-00-603-1338
FSC: 4710
CAGE: 96941 — UNISON INDUSTRIES, LLC (USA)
SPECIFICATIONS
materialPLASTIC CASE
duty_typeCONTINUOUS
design_formPREBENT
storage_typeGENERAL PURPOSE WAREHOUSE
coil_quantity1
cubic_measure9.844 CUBIC INCHES
overall_width1.250 INCHES NOMINAL IN
overall_height3.500 INCHES NOMINAL IN
overall_length2.250 INCHES NOMINAL IN
wall_thickness0.035 INCHES NOMINAL IN
fragility_factorMODERATELY RUGGED
winding_quantity1
NSN4710-00-603-1338
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: ER121 · 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
•
MATING END QUANTITY: 2 SINGLE END
•
DESIGN FORM: PREBENT
•
WALL THICKNESS: 0.035 INCHES NOMINAL IN
•
END CONNECTION STYLE: MISCELLANEOUS SECOND END
•
TUBE OUTSIDE DIAMETER: 2.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESEND FITTING A: FLANGE-SWIVEL(QTY.1) X 575C914G4 CONNECTOR(QTY.1) // BETWEEN END FITTINGS A&B: FLEXIBLE SECTION(QTY.1) (3.00 IN.LENGTH) // END FITTING B: 1.250 OD X 0.035 WALL TUBE X FLANGE-SWIVEL(QTY.1) IN
PART NAME ASSIGNED BY CONTROLLING AGENCYDRAWING ITEM NAME: TUBE, AIR - ANTI-ICING, AFT
MATING END QUANTITY2 SINGLE END
DESIGN FORMPREBENT
WALL THICKNESS0.035 INCHES NOMINAL IN
END CONNECTION STYLEMISCELLANEOUS SECOND END
TUBE OUTSIDE DIAMETER2.000 INCHES NOMINAL IN
END ITEM IDENTIFICATIONACAFT ENG
END CONNECTION STYLEMISCELLANEOUS FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
25637Interchangeable
interchangeable cross-reference
interchangeable
ER121Interchangeable
interchangeable cross-reference
interchangeable
ZKU900160Interchangeable
interchangeable cross-reference
interchangeable
ZKU02012Interchangeable
interchangeable cross-reference
interchangeable
8012Interchangeable
interchangeable cross-reference
interchangeable
874C758P1Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ER121?
ER121 is a RELAY,ELECTROMAGNETIC.
What parts can replace ER121?
There are 8 known substitutes for ER121: 25637, ER121, ZKU900160 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ER121?
ER121 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4710-00-603-1338. 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