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Technical Data Sheet
WD-42-A ✓ Verified by PartsTable
· COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

RESISTOR,VARIABLE,NONWIRE WOUND,. Key specifications include material: STEEL LOCATION NOT OTHERWISE SPECIFIED, body_shape: ROUND, design_type: DRY, coolant_type: AIR, inlet_location: OFFSET LOCATED ON END OF BODY, muffler_design: BAFFLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2990-00-185-7028, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
WD-42-A
NSN: 2990-00-185-7028
FSC: 2990
CAGE: 66289 — WISCONSIN MOTORS, LLC (USA)
SPECIFICATIONS
materialSTEEL LOCATION NOT OTHERWISE SPECIFIED
body_shapeROUND
design_typeDRY
coolant_typeAIR
tube_quantity3
inlet_locationOFFSET LOCATED ON END OF BODY
muffler_designBAFFLE
overall_length17.062 INCHES NOMINAL IN
baffle_quantity1
outlet_locationOFFSET LOCATED ON END OF BODY
thread_locationEXTERNAL FIRST OUTLET
overall_diameter4.620 INCHES NOMINAL IN
NSN2990-00-185-7028
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RESISTOR,VARIABLE,NONWIRE WOUND, TITLE COMPONENT PN WD-42-A MFR RESISTOR,VARIABLE,NONW
KEY FEATURES
OPERATING POSITION: HORIZONTAL
INLET THREAD SERIES DESIGNATOR: NPT SINGLE INLET
OUTLET THREAD SERIES DESIGNATOR: NPT FIRST OUTLET
OUTLET THREAD SIZE: 1-11-1/2 FIRST OUTLET
INLET THREAD LOCATION: EXTERNAL SINGLE INLET
SURFACE TREATMENT: PLASTIC POLYPROPYLENE
BAFFLE QUANTITY: 1
TECHNICAL CHARACTERISTICS (FLIS)
OPERATING POSITIONHORIZONTAL
INLET THREAD SERIES DESIGNATORNPT SINGLE INLET
OUTLET THREAD SERIES DESIGNATORNPT FIRST OUTLET
OUTLET THREAD SIZE1-11-1/2 FIRST OUTLET
END ITEM IDENTIFICATIONGRUMMAN AEROSPACE A-10 AIRCRAFT
INLET THREAD LOCATIONEXTERNAL SINGLE INLET
SURFACE TREATMENTPLASTIC POLYPROPYLENE
BAFFLE QUANTITY1
OVERALL DIAMETER4.620 INCHES NOMINAL IN
SPECIAL FEATURESWEAPON SYSTEM ESSENTIAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
87-0502Interchangeable
interchangeable cross-reference
interchangeable
107403Interchangeable
interchangeable cross-reference
interchangeable
42294Interchangeable
interchangeable cross-reference
interchangeable
1591Interchangeable
interchangeable cross-reference
interchangeable
1871-3-8INInterchangeable
interchangeable cross-reference
interchangeable
1862Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is WD-42-A?
WD-42-A is a RESISTOR,VARIABLE,NONWIRE WOUND,.
What parts can replace WD-42-A?
There are 15 known substitutes for WD-42-A: 87-0502, 107403, 42294 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for WD-42-A?
WD-42-A is cataloged in the Federal Logistics Information System (FLIS) under NSN 2990-00-185-7028. This indicates validated use in U.S. government and defense supply chains.
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