Keystone Electronics · Electronic Components
1257
TERMINAL QUICK FIT DUAL .250"
Part Number1257
ManufacturerKeystone Electronics
AvailabilityAvailable to order — request a quote
Specifications
NSN5975-00-432-2820 (NSN)
Federal Item NameADAPTER,ELECTRICAL CONDUIT
Federal Supply Class5975 — Electrical Hardware and Supplies
Item Accommodated Trade Size3.500 INCHES FIRST END
Surface TreatmentCADMIUM
Conduit Type AccommodatedRIGID METALLIC THICKWALL FIRST END
End TypeINTERNAL THREAD SECOND END
Style DesignatorTHREAD TO THREAD REDUCER
MaterialIRON MALLEABLE
Overall Length1.562 INCHES NOMINAL
Vendor Part Numbers1177, RB-350-300
Tube TypeTHYRATRON
Nondefinitive Spec Std Data1257 TYPE
Cancelled NSN5960-00-851-8003 (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 1257 available?
We can source 1257 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 1257 by Keystone Electronics obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 1257 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 1257?
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 1257?
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.