MIL-SPEC · Electronic Components
5FMK4
Synchro, Receiver
Part Number5FMK4
ManufacturerMIL-SPEC
AvailabilityAvailable to order — request a quote
Specifications
NSN5990-00-504-8279 (NSN)
Federal Item NameSYNCHRO,RECEIVER
Federal Supply Class5990 — Synchros and Resolvers
Flange Diameter3.6230 INCHES MINIMUM AND 3.6250 INCHES MAXIMUM
Overall Length6.3600 INCHES MAXIMUM
Pilot Diameter1.6300 INCHES MAXIMUM
Flange Thickness0.2450 INCHES MINIMUM AND 0.2500 INCHES MAXIMUM
Body StyleSTANDARD ROUND DOUBLE FLANGE B
Shoulder Diameter3.3750 INCHES MAXIMUM
Length1.2450 INCHES MINIMUM AND 1.2550 INCHES MAXIMUM SHOULDER
Torque Gradient Per Angular Deg0.400 INCH-OUNCES MINIMUM
Distance Between Flanges1.8070 INCHES MINIMUM AND 1.8170 INCHES MAXIMUM
Frequency In Hertz60.0 NOMINAL
Shaft Thread Class2A SINGLE SHAFT
Cancelled NSN5990-00-948-7757 (cancelled)
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 5FMK4 available?
We can source 5FMK4 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 5FMK4 by MIL-SPEC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 5FMK4 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 5FMK4?
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 5FMK4?
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.