Jewell Instruments LLC · Electronic Components
4991-027
Meter, Electrical Frequency
Part Number4991-027
ManufacturerJewell Instruments LLC
AvailabilityAvailable to order — request a quote
Specifications
NSN6625-00-879-4101 (NSN)
Federal Item NameMETER,ELECTRICAL FREQUENCY
Federal Supply Class6625 — Test Instruments
Mounting Stud Length1.469 INCHES NOMINAL
Center To Center Distance Between3.376 INCHES NOMINAL
Installation DesignPANEL
Frequency Response Range+350.000 TO 450.000 HERTZ
Meter Depth Behind Mounting Flange3.875 INCHES MAXIMUM
Mounting Facility Type And Quantit4 THREADED STUD(S)
Meter Body Diameter Behind Mountin4.000 INCHES MAXIMUM
Circuit Attachment Method And Quan3 SOLDER STUD
Features ProvidedZERO ADJUSTER
Style DesignatorRECTANGULAR FLUSH MTG
FSC Application DataTEST SET,ELECT. EQUIP.
Vendor Part Numbers499-027
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 4991-027 available?
We can source 4991-027 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 4991-027 by Jewell Instruments LLC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 4991-027 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 4991-027?
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 4991-027?
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.