PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 1255/12
1255/12 ✓ Verified by PartsTable
— · WIRE CABLE
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 1255/12 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6145-00-757-2742, 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
1255/12
NSN: 6145-00-757-2742
FSC: 6145
CAGE: 92194 — BELDEN, INC. (USA)
SPECIFICATIONS
Part Number1255/12
NSN6145-00-757-2742
COMPONENT DIAGRAM
WIRE / CABLE — AMPACITY DEPENDS ON INSTALLATION CROSS-SECTION JACKET WIRE SPECIFICATIONS Conductor Size: — Conductor Count: — Voltage Rating: — Insulation: — Temp Rating: — PN: 1255/12 · 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
•
TEMP RATING: -20.0 CELSIUS AND 80.0 CELSIUS DEGC
•
SURFACE TREATMENT: TIN CORE CONDUCTOR ALL CONDUCTORS
•
MATERIAL: COPPER CORE CONDUCTOR ALL CONDUCTORS
•
CONDUCTOR ARRANGEMENT AND QUANTITY: 12 SINGLES
•
STRAND AWG SIZE PER CONDUCTOR: 34 ALL CONDUCTORS
•
STRAND QUANTITY PER CONDUCTOR: 26 ALL CONDUCTORS
•
CONDUCTOR FORM: STRANDED ALL CONDUCTORS
TECHNICAL CHARACTERISTICS (FLIS)
TEMP RATING-20.0 CELSIUS AND 80.0 CELSIUS DEGC
SURFACE TREATMENTTIN CORE CONDUCTOR ALL CONDUCTORS
MATERIALCOPPER CORE CONDUCTOR ALL CONDUCTORS
CONDUCTOR ARRANGEMENT AND QUANTITY12 SINGLES
STRAND AWG SIZE PER CONDUCTOR34 ALL CONDUCTORS
STRAND QUANTITY PER CONDUCTOR26 ALL CONDUCTORS
MATERIALRUBBER SYNTHETIC FIRST POSITION PRIMARY INSULATION ALL CONDUCTORS
CONDUCTOR FORMSTRANDED ALL CONDUCTORS
COLORBLACK FIRST POSITION JACKET CABLE
CONDUCTOR QUANTITY12
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
A3749MInterchangeable
interchangeable cross-reference
interchangeable
1255-12Interchangeable
interchangeable cross-reference
interchangeable
B4964-ITEM-4Interchangeable
interchangeable cross-reference
interchangeable
B4964Interchangeable
interchangeable cross-reference
interchangeable
B4964 REV A SHEET 1 FIND 4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1255/12?
1255/12 is a 1255/12.
What parts can replace 1255/12?
There are 5 known substitutes for 1255/12: A3749M, 1255-12, B4964-ITEM-4 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1255/12?
1255/12 is cataloged in the Federal Logistics Information System (FLIS) under NSN 6145-00-757-2742. 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