Keystone · Electronic Components
8403
STDOFF HEX M/F 4-40 .750"L ALUM
Part Number8403
ManufacturerKeystone
AvailabilityIn stock — ships fast
Specifications
NSN5960-00-106-0545 (NSN)
Federal Item NameELECTRON TUBE
Federal Supply Class5960 — Electron Tubes
Tube TypeTRIODE
MaterialPLASTIC NYLON
Overall Length1.96 INCHES MAXIMUM
Vendor Part Numbers3891288C1
ESD/EMICode A — ESD/EMI sensitive item
Conductor FormSTRANDED ALL CONDUCTORS
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 8403 in stock?
Yes — 8403 is in our stock database. Request a quote for current pricing and lead time.
Is 8403 by Keystone obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 8403 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 8403?
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 8403?
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.