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990FR12-428 — NUT,PLAIN,HEXAGON

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

990FR12-428: NUT,PLAIN,HEXAGON.

The NUT,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include special_features: PER T.O. 6J5-59-3 FIG 4 INDEX 48, end_item_identification: C-135 AIRCRAFT.

This part is cataloged in the U.S. Government catalog under NSN 5310-00-198-4735, 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
990FR12-428
NSN: 5310-00-198-4735
NIINs: 001984735, 015753497
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
special_featuresPER T.O. 6J5-59-3 FIG 4 INDEX 48
end_item_identificationC-135 AIRCRAFT
NSN5310-00-198-4735
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 990FR12-428 · 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: 0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
•
THREAD SERIES: UNF
•
PRECIOUS MATERIAL: SILVER
•
TEMP RATING: 1200.0 FAHRENHEIT NOMINAL DEGF
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI ASSN STD 1ST MATERIAL RESPONSE OR AMS 5642 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5642 ASSN STD 3RD MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.428 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
THREAD SERIESUNF
PRECIOUS MATERIALSILVER
TEMP RATING1200.0 FAHRENHEIT NOMINAL DEGF
MATERIAL DOCUMENT AND CLASSIFICATIONAISI ASSN STD 1ST MATERIAL RESPONSE OR AMS 5642 ASSN STD 2ND MATERIAL RESPONSE OR AMS 5642 ASSN STD 3RD MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.250 INCHES IN
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT0.396 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN
SURFACE TREATMENTSILVER OVERALL
SUBSTITUTES & CROSS-REFERENCES 7
JL4907-428Reference document
Same NSN cross-reference
Reference document — Secondary reference
R419P4AReference document
Same NSN cross-reference
Reference document — Secondary reference
R419P4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
R419P4CReference document
Same NSN cross-reference
Reference document — Secondary reference
R419P4DReference document
Same NSN cross-reference
Reference document — Secondary reference
Z1200-048Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 990FR12-428?
990FR12-428 is a NUT,PLAIN,HEXAGON.
What parts can replace 990FR12-428?
There are 7 known substitutes for 990FR12-428: JL4907-428, R419P4A, R419P4 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 990FR12-428?
990FR12-428 is cataloged in the U.S. Government catalog under NSN 5310-00-198-4735. 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.