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R4503 ✓ Verified by PartsTable
— · COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The CUTTER,MILLING,SHELL END is a the manufacturer industrial component. Key specifications include width: 1.250 INCHES NOMINAL IN, material: ASBESTOS FRICTION LINING, thickness: 0.250 INCHES NOMINAL IN, body_style: STRAIGHT SHAPE W/CLAMP, body_width: 0.270 INCHES NOMINAL IN, bore_shape: STRAIGHT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3455-00-231-3528, 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
R4503
NSN: 3455-00-231-3528
FSC: 3455
CAGE: 33689 — NIAGARA CUTTER INC (USA)
SPECIFICATIONS
width1.250 INCHES NOMINAL IN
materialASBESTOS FRICTION LINING
thickness0.250 INCHES NOMINAL IN
body_styleSTRAIGHT SHAPE W/CLAMP
body_width0.270 INCHES NOMINAL IN
bore_shapeSTRAIGHT
body_height0.150 INCHES NOMINAL IN
body_length0.760 INCHES NOMINAL IN
lining_styleBULK LINING
usage_designPOWER SUPPLY RECTIFIER AND REGULATOR
bore_diameter55.0 MILLIMETERS NOMINAL MM
overall_width29.0 MILLIMETERS NOMINAL MM
NSN3455-00-231-3528
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CUTTER,MILLING,SHELL END TITLE COMPONENT PN R4503 MFR CUTTER,MILLING,SHELL E
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
18M4B-AC0-T0GH3349Interchangeable
interchangeable cross-reference
interchangeable
SM-18Interchangeable
interchangeable cross-reference
interchangeable
1134617-2Interchangeable
interchangeable cross-reference
interchangeable
111555Interchangeable
interchangeable cross-reference
interchangeable
54135Interchangeable
interchangeable cross-reference
interchangeable
59300Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is R4503?
R4503 is a CUTTER,MILLING,SHELL END.
What parts can replace R4503?
There are 22 known substitutes for R4503: 18M4B-AC0-T0GH3349, SM-18, 1134617-2 and 19 more. Substitute compatibility should be verified for your specific system.
What is the NSN for R4503?
R4503 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3455-00-231-3528. 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