Ai-Tek Instruments LLC · Electronic Components
A21643
Indicator, Fault Locating
Part NumberA21643
ManufacturerAi-Tek Instruments LLC
AvailabilityAvailable to order — request a quote
Specifications
NSN6625-00-173-4977 (NSN)
Federal Item NameINDICATOR,FAULT LOCATING
Federal Supply Class6625 — Test Instruments
Length0.840 INCHES NOMINAL
Current TypeDC
Coil Dc Resistance800.0 OHMS NOMINAL
Mounting Facility Type And Quantit1 BUSHING
Criticality Code JustificationFEAT
Electrical Connection Quantity2
Dc Voltage Rating28.0 VOLTS NOMINAL
Presentation TypeWINDOW
Diameter0.750 INCHES NOMINAL
Vendor Part Numbers428C2640-01-023, 421-004-9001
Cancelled NSN6610-00-276-5028 (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 A21643 available?
We can source A21643 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 A21643 by Ai-Tek Instruments LLC obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If A21643 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 A21643?
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 A21643?
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.