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Technical Data Sheet
PartsTable / COMPONENT / B-28703
B-28703 ✓ Verified by PartsTable
— · MOTOR
WHAT YOU NEED TO KNOW
NEMA frame determines mounting bolt pattern TEFC for outdoor, ODP for dry indoor only
C-face vs foot-mount — different mounting
PRODUCT OVERVIEW

The B-28703 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 6105-00-374-8743, 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
B-28703
NSN: 6105-00-374-8743
FSC: 6105
CAGE: 23926 — KOMATSU AMERICA CORPORATION (USA)
SPECIFICATIONS
Part NumberB-28703
NSN6105-00-374-8743
COMPONENT DIAGRAM
ELECTRIC MOTOR — FRAME SIZE = MOUNTING PATTERN SHAFT J-BOX MOUNTING FEET — FRAME — — · — RPM — · — PN: B-28703 · OEM ⚠ VERIFY BEFORE ORDERING NEMA frame size determines mounting bolt pattern — not interchangeable. 56C ≠ 143T bolt pattern. C-face vs foot-mount vs flange — different mounting, same HP doesn't mean drop-in ✓ BROKER TIP TEFC = outdoor/washdown OK. ODP = dry indoor only. TENV = no external fan, explosion-proof areas. 1750 RPM = 4-pole (most common), 3450 RPM = 2-pole, 1150 RPM = 6-pole PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
OVERALL DIAMETER: 5.5000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH4.5000 INCHES NOMINAL IN
OVERALL DIAMETER5.5000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
28-703Interchangeable
interchangeable cross-reference
interchangeable
1302384Interchangeable
interchangeable cross-reference
interchangeable
MIL-R-39008/3Interchangeable
interchangeable cross-reference
interchangeable
10011657Interchangeable
interchangeable cross-reference
interchangeable
AX2474Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B-28703?
B-28703 is a B-28703.
What parts can replace B-28703?
There are 5 known substitutes for B-28703: 28-703, 1302384, MIL-R-39008/3 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B-28703?
B-28703 is cataloged in the Federal Logistics Information System (FLIS) under NSN 6105-00-374-8743. 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