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90-003-4 — RELAY,ELECTROMAGNETIC

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

90-003-4: RELAY,ELECTROMAGNETIC.

The RELAY,ELECTROMAGNETIC is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY RETAINER, duty_type: CONTINUOUS, nut_style: CAP, bore_shape: STRAIGHT, nut_height: 0.455 INCHES NOMINAL IN, thread_class: 2A SINGLE MOUNTING FACILITY A. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-134-3949, 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
90-003-4
NSN: 5310-00-134-3949
NIINs: 001343949, 009264712, 009926401, 015147164, 015878819
FSC: 5310 — Nuts and Washers
CAGE: 019L2 — ESNA, LLC (USA)
SPECIFICATIONS
materialCOPPER ALLOY RETAINER
duty_typeCONTINUOUS
nut_styleCAP
bore_shapeSTRAIGHT
nut_height0.455 INCHES NOMINAL IN
thread_class2A SINGLE MOUNTING FACILITY A
bore_diameter7.8740 INCHES NOMINAL IN
coil_quantity1
overall_width1.620 INCHES NOMINAL IN
thread_seriesUNF
overall_height1.370 INCHES NOMINAL IN
overall_length3.680 INCHES NOMINAL IN
NSN5310-00-134-3949
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 90-003-4 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
WIDTH ACROSS FLATS: 0.499 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
•
NUT HEIGHT: 0.455 INCHES NOMINAL IN
•
NUT STYLE: CAP
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.499 INCHES NOMINAL IN
THREAD SERIESUNF
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
NUT HEIGHT0.455 INCHES NOMINAL IN
NUT STYLECAP
THREAD CLASS2B
THREAD QUANTITY PER INCH28
MATERIALSTEEL OVERALL EXCEPT INSERT
SUBSTITUTES & CROSS-REFERENCES 1
A436A4A1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 90-003-4?
90-003-4 is a RELAY,ELECTROMAGNETIC.
What parts can replace 90-003-4?
There is 1 known substitute for 90-003-4: A436A4A1. Substitute compatibility should be verified for your specific system.
What is the NSN for 90-003-4?
90-003-4 is cataloged in the U.S. Government catalog under NSN 5310-00-134-3949. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.