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Technical Data Sheet
PartsTable / MRO / 421-291
421-291 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Stranded for flexible routing, solid for conduit THHN/THWN dual-rated — check both tables
Ampacity depends on installation method
PRODUCT OVERVIEW

The 421-291 is a the manufacturer industrial component. Key specifications include duty_type: CONTINUOUS, overall_width: 1.560 INCHES NOMINAL IN, overall_height: 2.750 INCHES NOMINAL IN, overall_length: 1.620 INCHES NOMINAL IN, end_item_identification: PART NO. RG15A1, environmental_protection: HERMETIC.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6145-00-253-2615, 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
MRO→ MRO_GENERAL→ 421-291
NSN: 6145-00-253-2615
FSC: 6145
CAGE: 07497 — ESSEX GROUP INC TELECOMMUNICATION PRODUCTS DIV (USA)
SPECIFICATIONS
duty_typeCONTINUOUS
coil_quantity2
overall_width1.560 INCHES NOMINAL IN
overall_height2.750 INCHES NOMINAL IN
overall_length1.620 INCHES NOMINAL IN
winding_quantity2
end_item_identificationPART NO. RG15A1
environmental_protectionHERMETIC
mounting_facility_patternRECTANGULAR SINGLE MOUNTING FACILITY
terminal_type_and_quantity16 PIN ALL FUNCTIONS
winding_dc_resistance_rating675.0 OHMS NOMINAL ALL WINDINGS
unthreaded_mounting_hole_diameter0.141 INCHES NOMINAL SINGLE MOUNTING FACILITY IN
NSN6145-00-253-2615
COMPONENT DIAGRAM
WIRE / CABLE — AMPACITY DEPENDS ON INSTALLATION CROSS-SECTION JACKET WIRE SPECIFICATIONS Conductor Size: — Conductor Count: — Voltage Rating: — Insulation: — Temp Rating: — PN: 421-291 · OEM ⚠ VERIFY BEFORE ORDERING Ampacity depends on installation method — conduit ≠ free air ≠ underground. Same wire, different ratings. AWG sizing is inverse — smaller number = thicker wire (4 AWG > 12 AWG) ✓ BROKER TIP Stranded = flexible routing and vibration resistance. Solid = fixed conduit runs only. THHN/THWN = dual rated — check both dry and wet ampacity tables PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
STRAND AWG SIZE PER CONDUCTOR: 38 SINGLE CONDUCTOR
•
CONDUCTOR ARRANGEMENT AND QUANTITY: 1 COAXIAL
•
CONDUCTOR FORM: STRANDED SINGLE CONDUCTOR
•
STRAND QUANTITY PER CONDUCTOR: 7 SINGLE CONDUCTOR
•
CROSS SECTION OUTSIDE DIAMETER: 0.145 INCHES NOMINAL IN
•
SURFACE TREATMENT: SILVER CORE CONDUCTOR SINGLE CONDUCTOR
•
ELECTRICAL RESISTANCE: 75.0 OHMS IMPEDANCE
•
CROSS-SECTIONAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS (FLIS)
STRAND AWG SIZE PER CONDUCTOR38 SINGLE CONDUCTOR
CONDUCTOR ARRANGEMENT AND QUANTITY1 COAXIAL
CONDUCTOR FORMSTRANDED SINGLE CONDUCTOR
STRAND QUANTITY PER CONDUCTOR7 SINGLE CONDUCTOR
CROSS SECTION OUTSIDE DIAMETER0.145 INCHES NOMINAL IN
SURFACE TREATMENTSILVER CORE CONDUCTOR SINGLE CONDUCTOR
ELECTRICAL RESISTANCE75.0 OHMS IMPEDANCE
CROSS-SECTIONAL SHAPE STYLEROUND
CONDUCTOR QUANTITY1
ROUND CONDUCTOR SIZE30 AWG SINGLE CONDUCTOR
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
14397Upgraded Successor
successor cross-reference
successor
733-16951Upgraded Successor
successor cross-reference
successor
SM-C-500968Interchangeable
interchangeable cross-reference
interchangeable
5-71057Interchangeable
interchangeable cross-reference
interchangeable
51R16Interchangeable
interchangeable cross-reference
interchangeable
11377Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 421-291?
421-291 is a 421-291. It is classified as a MRO (MRO_GENERAL).
What parts can replace 421-291?
There are 15 known substitutes for 421-291: 14397, 733-16951, SM-C-500968 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 421-291?
421-291 is cataloged in the Federal Logistics Information System (FLIS) under NSN 6145-00-253-2615. 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