PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

121BResistor,current Regulating

Westinghouse Electric Corp · NSN 5905-00-665-2215 · FSC 5905 · No Item Name Available
Verified by PartsTable
NSN 5905-00-665-2215 — this item is cataloged by the U.S. Government under National Stock Number 5905-00-665-2215. Primary manufacturer part number: 121B.
Features
  • Resistor,current Regulating — FSC 5905
  • Threshold Voltage in Volts: 5.5
  • Base Type: 4 PIN
  • Current Range in Amps: +0.765 TO 0.965
  • Envelope Type Per Mil-E-1: NOT APPLICABLE
  • Current Type: AC/DC
  • Resistive Element Pin Connection: 1 AND 4
  • 1 verified cross-reference
Applications
  • Circuit regulation and filtering
  • Signal conditioning
  • Power supply stabilization
General Description

The Resistor,current Regulating, cataloged under National Stock Number 5905-00-665-2215, is classified within Federal Supply Class 5905 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Westinghouse Electric Corp. Government technical data includes 6 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5905-00-665-2215
Primary Part Number121B
Item NameResistor,current Regulating
FSC / FSG5905 / 59 — No Item Name Available
ManufacturerWestinghouse Electric Corp
StatusACTIVE
Threshold Voltage in Volts5.5
Base Type4 PIN
Current Range in Amps+0.765 TO 0.965
Envelope Type Per Mil-E-1NOT APPLICABLE
Current TypeAC/DC
Resistive Element Pin Connection1 AND 4
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
5306-00-362-370721055A INTERCHANGEABLE
Bolt,eccentric Head
Brinkley Technology Group Llc Dba Hercules Manufacturing
4720-00-881-3911 INTERCHANGEABLE
Hose Assembly,metallic
6130-01-267-4467121B INTERCHANGEABLE
Power Supply
Ametek Programmable Power, Inc.
4730-01-597-5851121-B INTERCHANGEABLE
Plug,tube Fitting,threaded
Fairview Fitting & Manufacturing, Inc.
Cross-Reference Index
Part NumberManufacturer
121B PRIMARY Westinghouse Electric Corp (USA)
Related Parts
5306-00-362-3707INTERCHANGEABLE
BOLT,ECCENTRIC HEAD
21055A
4720-00-881-3911INTERCHANGEABLE
HOSE ASSEMBLY,METALLIC
6130-01-267-4467INTERCHANGEABLE
POWER SUPPLY
121B
4730-01-597-5851INTERCHANGEABLE
PLUG,TUBE FITTING,THREADED
121-B

Frequently Asked Questions

What is NSN 5905-00-665-2215?

NSN 5905-00-665-2215 is a Resistor,current Regulating, manufactured by Westinghouse Electric Corp, classified under FSC 5905 (No Item Name Available). Status: active.

What are the part numbers for NSN 5905-00-665-2215?

NSN 5905-00-665-2215 has 1 cross-referenced part number: 121B (Westinghouse Electric Corp).

What NSN replaces 5905-00-665-2215?

There are 4 known substitutes for 5905-00-665-2215: 5306-00-362-3707, 4720-00-881-3911, 6130-01-267-4467 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 121B?

Key specifications for 121B: Threshold Voltage in Volts: 5.5; Base Type: 4 PIN; Current Range in Amps: +0.765 TO 0.965; Envelope Type Per Mil-E-1: NOT APPLICABLE. 6 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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