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721023 — HEATING ELEMENT,ELECTRICAL,NONIM

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

721023: HEATING ELEMENT,ELECTRICAL,NONIM.

HEATING ELEMENT,ELECTRICAL,NONIM. Key specifications include end_item_identification: 4320-01-300-3490; SUPPORT EQUIPMENT C-17A AIRCRAFT A. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-418-2683, 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
721023
NSN: 5310-00-418-2683
NIINs: 004182683, 009348037, 012831707, 014209962
FSC: 5310 — Nuts and Washers
CAGE: 98675 — ESPEY MFG. & ELECTRONICS CORP. (USA)
SPECIFICATIONS
end_item_identification4320-01-300-3490; SUPPORT EQUIPMENT C-17A AIRCRAFT A
NSN5310-00-418-2683
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 721023 · 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
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WIDTH ACROSS FLATS: 0.188 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
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THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
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HARDNESS RATING: 70.0 ROCKWELL B MAXIMUM
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MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A582,CONDITION A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
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THREAD DIRECTION: RIGHT-HAND
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NOMINAL THREAD SIZE: 0.112 INCHES IN
•
PILOT DIAMETER: 0.165 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.188 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
HARDNESS RATING70.0 ROCKWELL B MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A582,CONDITION A ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.112 INCHES IN
PILOT DIAMETER0.165 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN
NUT HEIGHT0.432 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
S235A040-15Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 721023?
721023 is a HEATING ELEMENT,ELECTRICAL,NONIM.
What parts can replace 721023?
There is 1 known substitute for 721023: S235A040-15. Substitute compatibility should be verified for your specific system.
What is the NSN for 721023?
721023 is cataloged in the U.S. Government catalog under NSN 5310-00-418-2683. 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.