MCM · Electronic Components
28-503
1/2 WATT HORIZONTAL POTENTIOMETERS, RESISTANCE: 250 KOHM, DIMENSIONS: (H X W X L) .56 X .44 X .63
Part Number28-503
ManufacturerMCM
AvailabilityAvailable to order — request a quote
Specifications
NSN5977-00-102-4008 (NSN)
Federal Item NameBRUSH,ELECTRICAL CONTACT
MaterialCARBON
Terminals1 STRAIGHT W/SLOT
Body StyleRECTANGULAR COMMUTATOR
Width0.865 INCHES MINIMUM AND 0.875 INCHES MAXIMUM
Shunt Insulation Provision And Qua1 UNINSULATED
Brush Shunt Length3.500 INCHES MINIMUM AND 3.625 INCHES MAXIMUM SINGLE SHUNT
Top StyleBEVELED FRONT
Contact Face StyleFLAT
Angle30.0 DEGREES NOMINAL
Shunt Position Designator2
Federal Supply Class5977 — Electrical Contact Brushes And Electrodes
Terminal Type And Quantity1 STRAIGHT W/SLOT
Length1.219 INCHES MINIMUM AND 1.281 INCHES MAXIMUM
Style DesignatorONE PIECE
RH Electronics, Inc. — independent stocking distributor since 1982.
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Frequently asked
Is 28-503 available?
We can source 28-503 even if it isn't in our active stock list. As an independent distributor we reach inventory outside the franchise channel — including hard-to-find and obsolete parts. Send us a quote request.
Is 28-503 by MCM obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 28-503 has been discontinued, we can often source remaining stock or qualified alternates. Contact us with your quantity and target date.
How does RH Electronics verify parts like 28-503?
Every incoming shipment is inspected under our ISO 9001:2015 quality system — documentation, markings, and construction checked against known-good references. For deeper analysis, we direct work through accredited independent labs. We've been an ERAI member since 1998 and a GIDEP participant.
Can you find a cross-reference or alternate for 28-503?
Yes. Our team reads part numbers the way they were designed — decoding family, speed, temperature grade, package, and reliability level — to identify acceptable alternates when the exact part isn't available. Submit a quote request and we'll advise.